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Sample records for advanced stellar compass

  1. THE ADVANCED STELLAR COMPASS

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Liebe, Carl Christian

    1997-01-01

    demand the Advanced Stellar Compass (ASC), a fully autonomous miniature star tracker, was developed. This ASC is capable of both solving the "lost in space" problem and determine the attitude with arcseconds precision. The development, principles of operation and instrument autonomy of the ASC is...

  2. THE ADVANCED STELLAR COMPASS

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Liebe, Carl Christian

    The science objective of the Danish Geomagnetic Research Satellite "Ørsted" is to map the magnetic field of the Earth, with a vector precision of a fraction of a nanotesla. This necessitates an attitude reference instrument with a precision of a few arcseconds onboard the satellite. To meet this...... demand the Advanced Stellar Compass (ASC), a fully autonomous miniature star tracker, was developed. This ASC is capable of both solving the "lost in space" problem and determine the attitude with arcseconds precision. The development, principles of operation and instrument autonomy of the ASC is...

  3. Advanced Stellar Compass - Alenia Mars Express

    DEFF Research Database (Denmark)

    Kilsgaard, Søren; Betto, Maurizio; Jørgensen, John Leif;

    1998-01-01

    This document, submitted in reply to an Alenia R.f.P., is a proposal to implement the Advanced Stellar Compass (ASC) in the Mars Express mission.The Mars Express is an ESA dedicated mission to Mars scientific investigation.The ASC is a very advanced instrument designed by the Space Instrumentation...

  4. Summary of the Advanced Stellar Compass

    DEFF Research Database (Denmark)

    Jørgensen, John Leif

    1997-01-01

    The current version of the Advanced Stellar Compass (ASC) is an improved implementation of the instrument developed for the Danish Geomagnetic Research Satellite Ørsted. The Ørsted version was successfully tested in space on the NASA sounding rocket "Thunderstorm III", that was launched September 2...

  5. The Advanced Stellar Compass, Development and Operations

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Liebe, Carl Christian

    1996-01-01

    The science objective of the Danish Geomagnetic Research Satellite "Ørsted" is to map the magnetic field of the Earth, with a vector precision of a fraction of a nanotesla. This necessitates an attitude reference instrument with a precision of a few arcseconds onboard the satellite. To meet...... this demand the Advanced Stellar Compass (ASC), a fully autonomous miniature star tracker, was developed. This ASC is capable of both solving the "lost in space" problem and determine the attitude with arcseconds precision. The development, principles of operation and instrument autonomy of the ASC...

  6. The Advanced Stellar Compass, Development and Operations

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Liebe, Carl Christian

    The science objective of the Danish Geomagnetic Research Satellite "Ørsted" is to map the magnetic field of the Earth, with a vector precision of a fraction of a nanotesla. This necessitates an attitude reference instrument with a precision of a few arcseconds onboard the satellite. To meet this...... demand the Advanced Stellar Compass (ASC), a fully autonomous miniature star tracker, was developed. This ASC is capable of both solving the "lost in space" problem and determine the attitude with arcseconds precision. The development, principles of operation and instrument autonomy of the ASC is...

  7. Advanced Stellar Compass Summary for the Auroral Lites mission

    DEFF Research Database (Denmark)

    Jørgensen, John Leif

    1998-01-01

    This document provides technical and managerial information about the Advanced Stellar Compass and its possible use in the Auroral Lites Project.The Auroral Lites is a NASA project.......This document provides technical and managerial information about the Advanced Stellar Compass and its possible use in the Auroral Lites Project.The Auroral Lites is a NASA project....

  8. Advanced Stellar Compass - Proposal for the LunARSat project

    DEFF Research Database (Denmark)

    Betto, Maurizio; Jørgensen, John Leif; Kilsgaard, Søren;

    1998-01-01

    request for proposal (r.f.p.) for the LunARSat star tracker.The Advanced Stellar Compass (ASC) is a highly advanced and autonomous Stellar Reference Unit designed, developed and produced by the Space Instrumentation Group of the Department of Automation of the Technical University of Denmark.The document...

  9. Advanced Stellar Compass - Proposal for the SMART-1 Project

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Betto, Maurizio; Kilsgaard, Søren;

    1998-01-01

    This proposal is the DTU response to the Swedish Space Corporation (SSC) request for proposal (r.f.p.) for the SMART-1 star tracker.SMART-1 is a small ESA scientific and technological satellite planned to be launched in late 2001.The Advanced Stellar Compass (ASC) is a highly advanced and...

  10. Autonomous vision in space, based on Advanced Stellar Compass platform

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Eisenman, Allan R.; Liebe, Carl Christian

    1996-01-01

    The Ørsted Star Imager, comprises the functionality of an Advanced Stellar Compass (ASC). I.e. it is able to, autonomously solve "the lost in space" attitude problem, as well as determine the attitude with high precision in the matter of seconds. The autonomy makes for a high capability for error...

  11. Advanced Stellar Compass - Adeos II - Interface Control Document

    DEFF Research Database (Denmark)

    Betto, Maurizio; Jørgensen, John Leif; Kilsgaard, Søren; Madsen, Peter Buch; Riis, Troels; Thuesen, Gøsta; Jørgensen, Finn

    This document describes the Advanced Stellar Compass (ASC) and defines the interfaces between the instrument and the ADEOS II satellite. The ASC is a highly advanced and autonomous Stellar Reference Unit designed, developed and produced by the Space Instrumentation Group of the Department of...... reliability issues. Section 6 deals with the testing and the calibration procedures and in section 7 the mechanical and electrical interfaces are given. In section 8 and 9 we address issues like manufacturing, transportation and storage, in section 10 the requirements imposed by the ASC on the system are...

  12. Vision in space, based on the advanced stellar compass

    DEFF Research Database (Denmark)

    Liebe, Carl Christian; Jørgensen, John Leif; Eisenman, Allan R.;

    1996-01-01

    A wide variety of Space-missions could benefit from advanced onboard image-analysis. With missions to other planets or asteroids as good examples (genotypes). With reference to the Oersted Advanced Stellar Compass, this paper describes possible onboard imageanalysis tasks. As the instrument tracks...... by open loop, or by man-in-loop systems. By implementing these methods or function in the onboard autonomy, a superior system performance could be acheived by means of the minimal loop delay. But also reduced operations cost should be expected. Examples of actual performance data are given....

  13. The advanced stellar compass onboard the Oersted satellite

    Science.gov (United States)

    Jorgensen, John L.; Liebe, Carl Christian; Eisenman, Allan R.; Jensen, Gunnar B.

    1997-01-01

    The advanced stellar compass (ASC) star tracker installed onboard the Danish Oersted satellite designed to map the earth's magnetic vector field is presented. The ASC instrument will provide attitude data for the satellite and its payload. It consists of a CCD camera connected to a microcomputer, and operates by comparing star images from camera frames with its internal star catalogs. The instrument design is detailed, considering its key parameters, operating principles, and the different types of noise and error sources. A ground-based real sky evaluation and the calibration of the ASC are reported.

  14. In-flight Quality and Accuracy of Attitude Measurements from the CHAMP Advanced Stellar Compass

    DEFF Research Database (Denmark)

    Jørgensen, Peter Siegbjørn; Jørgensen, John Leif; Denver, Troelz;

    2005-01-01

    The German geo-observations satellite CHAMP carries highly accurate vector instruments. The orientation of these relative to the inertial reference frame is obtained using star trackers. These advanced stellar compasses (ASC) are fully autonomous units, which provide, in real time, the absolute...... with modeling external noise sources often arise. The special CHAMP configuration with two star tracker cameras mounted fixed together provides an excellent opportunity to determine the AIA in-flight using the inter boresight angle....

  15. (abstract) Realization of a Faster, Cheaper, Better Mission and Its New Paradigm Star Tracker, the Advanced Stellar Compass

    Science.gov (United States)

    Eisenman, Allan Read; Liebe, Carl Christian; Joergensen, John Lief; Jensen, Gunnar Bent

    1997-01-01

    The first Danish satellite, rsted, will be launched in August of 1997. The scientific objective of sted is to perform a precision mapping of the Earth's magnetic field. Attitude data for the payload and the satellite are provided by the Advanced Stellar Compass (ASC) star tracker. The ASC consists of a CCD star camera and a capable microprocessor which operates by comparing the star image frames taken by the camera to its internal star catalogs.

  16. Stellar compass for the Clementine Mission

    Energy Technology Data Exchange (ETDEWEB)

    Wilson, B. [Lawrence Livermore National Lab., CA (United States)

    1994-11-15

    A CCD sensor with 42 x 28 degrees FOV and 576 x 384 pixels was built by the Advanced Technology Program (ATP) in the Physics Department at LLNL. That sensor, called the StarTracker camera, is used on the Clementine Lunar Mapping mission between January and May, 1994. Together with the Stellar Compass software, the StarTracker camera provided a way of identifying its orientation to within about 150 microradians in camera body pitch and yaw. This presentation will be an overview of basically how the Stellar Compass software works, along with showing some of its performance results.

  17. Advanced Stellar Compass ASCCHAT

    DEFF Research Database (Denmark)

    Jørgensen, John Leif

    1998-01-01

    The ASCCHAT program supports the full tele-command and telemetry structure of the ASC. It might be used for a variety of purposes such as: Familiarisation with the command structure of the ASC. Support for checkout of the ASC functionality. Support for real sky verification and performance envelope...

  18. Clementine Star Tracker Stellar Compass: Final report part 1

    Energy Technology Data Exchange (ETDEWEB)

    Priest, R.E.; Kordas, J.F.; Lewis, I.T. [and others

    1995-07-01

    The Clementine mission provided the first ever complete, systematic surface mapping of the moon from the ultra-violet to the near-infrared regions. More than 1.7 million images of the moon, earth and space were returned from this mission. Two star stracker stellar compasses (star tracker camera + stellar compass software) were included on the spacecraft, serving a primary function of providing angle updates to the guidance and navigation system. These cameras served a secondary function by providing a wide field of view imaging capability for lunar horizon glow and other dark-side imaging data. This 290 g camera using a 576 x 384 focal plane array and a 17 mm entrance pupil, detected and centroided stars as dim and dimmer than 4.5 m{sub v}, providing rms pointing accuracy of better than 100 {mu}rad pitch and yaw and 450 {mu}rad roll. A description of this light-weight, low power star tracker camera along with a summary of lessons learned is presented. Design goals and preliminary on-orbit performance estimates are addressed in terms of meeting the mission`s primary objective for flight qualifying the sensors for future Department of Defense flights. Documentation generated during the design, analysis, build, test and characterization of the star tracker cameras are presented. Collectively, this documentation represents a small library of information for this camera, and may be used as a framework for producing copy units by commercial enterprises, and therefore satisfies a Department of Defense and Department of Energy goal to transfer technology to industry. However, the considerable knowledge gained from the experience of the individuals involved in the system trades, design, analysis, production, testing and characterization of the star tracker stellar compass is not contained in this documentation.

  19. Advanced Stellar Compass - ROCSAT 2 - Proposal

    DEFF Research Database (Denmark)

    Riis, Troels; Betto, Maurizio; Jørgensen, John Leif;

    1998-01-01

    This proposal is the DTU response to the Dornier DSS (DSS) request for proposal (r.f.p.) for the ROCSAT-2 star tracker.ROCSAT-2 is jointly developed by DSS with the taiwanese Space Agency (NSPO) and consists mainly of an optical camera as well as a customer furnished scientific instrument. ROCSAT-2...

  20. Advanced Stellar Compass, CHAMP, Interface Control Document

    DEFF Research Database (Denmark)

    Madsen, Peter Buch; Jørgensen, John Leif; Betto, Maurizio;

    1999-01-01

    The German government research establishment "GeoForschungsZentrum" developed under a contract to the German government a microsatellite named "Champ". The Space Instrumentation Group has made a Interface Control Document for the CHAMP, witch describes the Star Imager, the electrical interface, t...... mechanical interface and the TC/TM protocols for the communication between the Star Tracker and the OBDH.......The German government research establishment "GeoForschungsZentrum" developed under a contract to the German government a microsatellite named "Champ". The Space Instrumentation Group has made a Interface Control Document for the CHAMP, witch describes the Star Imager, the electrical interface, the...

  1. Compassion.

    Science.gov (United States)

    Saunders, John

    2015-04-01

    The term 'compassion' has been much used and little discussed. I argue that compassion is a virtue in the Aristotelian sense, one of a family of other-regarding properties and belongs to the affective qualities of a moral agent. Its exercise is an essential component of good medical care in many situations and requires grounding in moral principles. Although our dispositions vary, compassion is a quality that can be developed in all of us. PMID:25824061

  2. Migrating songbirds tested in computer-controlled Emlen funnels use stellar cuesfor a time-independent compass

    DEFF Research Database (Denmark)

    Mouritsen, Henrik Østergaard; Larsen, Ole Næsbye

    2001-01-01

    with the predictions from five alternative stellar orientation hypotheses. The results supported the hypothesis suggesting that birds use a time-independent star compass based on learned geometrical star configurations to pinpoint the rotational point of the starry sky (north). In contrast, neither...... hypotheses suggesting that birds use the stars for establishing their global position and then perform true star navigation nor those suggesting the use of a time-compensated star compass were supported....

  3. Recent Advances in Modeling Stellar Interiors

    CERN Document Server

    Guzik, Joyce Ann

    2010-01-01

    Advances in stellar interior modeling are being driven by new data from large-scale surveys and high-precision photometric and spectroscopic observations. Here we focus on single stars in normal evolutionary phases; we will not discuss the many advances in modeling star formation, interacting binaries, supernovae, or neutron stars. We review briefly: 1) updates to input physics of stellar models; 2) progress in two and three-dimensional evolution and hydrodynamic models; 3) insights from oscillation data used to infer stellar interior structure and validate model predictions (asteroseismology). We close by highlighting a few outstanding problems, e.g., the driving mechanisms for hybrid gamma Dor/delta Sct star pulsations, the cause of giant eruptions seen in luminous blue variables such as eta Car and P Cyg, and the solar abundance problem.

  4. Recent advances in modeling stellar interiors (u)

    Energy Technology Data Exchange (ETDEWEB)

    Guzik, Joyce Ann [Los Alamos National Laboratory

    2010-01-01

    Advances in stellar interior modeling are being driven by new data from large-scale surveys and high-precision photometric and spectroscopic observations. Here we focus on single stars in normal evolutionary phases; we will not discuss the many advances in modeling star formation, interacting binaries, supernovae, or neutron stars. We review briefly: (1) updates to input physics of stellar models; (2) progress in two and three-dimensional evolution and hydrodynamic models; (3) insights from oscillation data used to infer stellar interior structure and validate model predictions (asteroseismology). We close by highlighting a few outstanding problems, e.g., the driving mechanisms for hybrid {gamma} Dor/{delta} Sct star pulsations, the cause of giant eruptions seen in luminous blue variables such as {eta} Car and P Cyg, and the solar abundance problem.

  5. Advanced stellar compass deep space navigation, ground testing results

    DEFF Research Database (Denmark)

    Betto, Maurizio; Jørgensen, John Leif; Jørgensen, Peter Siegbjørn;

    2006-01-01

    Deep space exploration is in the agenda of the major space agencies worldwide and at least the European Space Agency (SMART & Aurora Programs) and the American NASA (New Millennium Program) have set up programs to allow the development and the demonstration of technologies that can reduce the risks...... and the costs of the deep space missions. Navigation is the Achilles' heel of deep space. Being performed on ground, it imposes considerable constraints on the system and the operations, it is very expensive to execute, especially when the mission lasts several years and, above all, it is not failure tolerant...

  6. The Advanced Stellar Compass onboard the Oersted satellite

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Eisenman, Allan R.; Liebe, Carl Christian; Jensen, Gunnar Bent

    connected to a powerful microcomputer. The instrument is operating by comparing the images from the camera with an onboard star catalogue. This determines the attitude of the CCD camera relative to the celestial sphere. Performance evaluation and calibration of the instrument has been performed by menas of...

  7. Advanced stellar compass - Onboard autonomous orbit determination, preliminary performance

    DEFF Research Database (Denmark)

    Betto, Maurizio; Jørgensen, John Leif; Jørgensen, Peter Siegbjørn;

    2004-01-01

    of this instrument, the authors have devised a method to determine the orbit of a spacecraft autonomously, onboard, and without a priori knowledge of any kind. The solution is robust and fast. This paper presents the preliminary performance obtained during the ground testing in August 2002 at the Mauna Kea...... Observatories. The main goals were: (1) to assess the robustness of the method in solving autonomously, onboard, the position lost-in-space problem; (2) to assess the preliminary accuracy achievable with a single planet and a single observation; (3) to verify the autonomous navigation (AutoNav) module could...

  8. The Advanced Stellar Compass onboard the Oersted satellite

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Eisenman, Allan R.; Liebe, Carl Christian;

    1997-01-01

    connected to a powerful microcomputer. The instrument is operating by comparing the images from the camera with an onboard star catalogue. This determines the attitude of the CCD camera relative to the celestial sphere. Performance evaluation and calibration of the instrument has been performed by menas...

  9. Optimized advanced stellarators of linked mirror type

    International Nuclear Information System (INIS)

    Various different advanced stellarator configurations of the linked mirror type (LIMAS) have been investigated which differ in the magnetic mirror ratio and twist on the magnetic axis. One configuration is presented in the following. The vacuum fields are given analytically by a finite set of Dommaschk potentials. The magnetic field properties weighed in the optimization procedure are: the residue R* of two reference fixed lines (where the pressure gradient is high) which start at Z = 0 in the two symmetry planes and have the same value of the twist ι; the associated aspect ratio A; the difference ΔF of the magnetic flux F = ∫ A.dx between these two closed field lines belonging to the same rational ι-value (A is a vector potential, x is the radius vector, the line integral is performed over each of the fixed field lines); the deficit of the Hamada condition that ∫dl/B should have the same value for these two fixed lines; a condition on the magnetic well (ΔV'/V'ax ||2/j2>1/2 of the Pfirsch-Schlueter current density; the deviation of contours of B = const from contours of Q ∫dU/B2 = const (U is the scalar potential). This condition has the effect that the particles see small variations of the magnetic field along their poloidal rotation. This favours small values of the ambipolar diffusion coefficients in the long mean free path regime. The implementation of this constraint uses a Fourier decomposition of the magnetic field strength along a closed field line with respect to Q. The corresponding Bessel inequality is used as a quadratic measure (PR) of the 'amount of independency' of the Fourier coefficients as the poloidal coordinate. Some of the quoted conditions are also applied at a pair of fixed lines in the boundary region. (author) 4 refs., 11 figs

  10. Ripple transport in helical-axis advanced stellarators - a comparison with classical stellarator/torsatrons

    International Nuclear Information System (INIS)

    Calculations of the neoclassical transport rates due to particles trapped in the helical ripples of a stellarator's magnetic field are carried out, based on solutions of the bounce-averaged kinetic equation. These calculations employ a model for the magnetic field strength, B, which is an accurate approximation to the actual B for a wide variety of stellarator-type devices, among which are Helical-Axis Advanced Stellarators (Helias) as well as conventional stellarators and torsatrons. Comparisons are carried out in which it is shown that the Helias concept leads to significant reductions in neoclassical transport rates throughout the entire long-mean-free-path regime, with the reduction being particularly dramatic in the ν-1 regime. These findings are confirmed by numerical simulations. Further, it is shown that the behavior of deeply trapped particles in Helias can be fundamentally different from that in classical stellarator/torsatrons; as a consequence, the beneficial effects of a radial electric field on the transport make themselves felt at lower collision frequency than is usual. (orig.)

  11. A Stellar Reference Unit Design Study for SIRTF

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Liebe, Carl Christian

    1996-01-01

    A design study for a stellar reference unit, or star tracker, for SIRTF was conducted in FY96 in conjunction with the Tracking Sensors Group of the Avionic Equipment Section of JPL. The resulting design was derived from the Oersted, autonomous, Advanced Stellar Compass, star tracker. The projected...... star tracker integration with the cryogenic telescope structure....

  12. Astronomical performance of the engineering model Ørsted Advanced Stellar Compass

    DEFF Research Database (Denmark)

    Eisenman, Allan R.; Liebe, Carl Christian; Jørgensen, John Leif

    1996-01-01

    The Danish geomagnetic microsatellite, Orsted, is an autonomous sciencecraft which is scheduled for a May 1997 launch into polar orbit. It is produced by a consortium of universities, industry and government and is Denmark's first national spacecraft. NASA support includes JPL real sky evaluation...

  13. Recent advances in quasi-poloidal stellarator physics issues

    International Nuclear Information System (INIS)

    The quasi-poloidal stellarator (QPS) hybrid has been developed using a stellarator optimization approach that has proven to be compatible with low aspect ratio. This design includes a number of physics features that are of importance in the development of advanced toroidal devices. These include neoclassical transport levels significantly reduced relative to anomalous, low neoclassical poloidal flow damping rates, reduced bootstrap current levels (relative to the tokamak) that are compatible with steady-state operation, and ballooning second stable regimes. Recent QPS physics research has focused on the calculation of self-consistent plasma flows and the development of physics flexibility scenarios utilizing variable coil and plasma currents. A moments-based analysis has verified that the quasi-symmetry in QPS is sufficient so as to lead to significantly reduced poloidal plasma viscosity. The resulting flux surface averaged plasma flows are dominantly in the poloidal direction with radial shearing. As a result of the low aspect ratio, there is also significant shearing in direction and magnitude of these flows within a flux surface. These features may be useful in suppressing ballooning modes as well as shorter scale length turbulence. Substantial flexibility in the variation of QPS physics properties has been demonstrated through the control of modular, vertical, and toroidal magnet coil currents. Both the low collisonality transport and poloidal viscosity can be varied by large factors by appropriate coil current programming. This system can also be used to suppress magnetic islands both through directly targeting residues of the dominant island chains or by tailoring the rotational transform profile to remain between adjacent resonances. Such methods are applicable both to vacuum and finite plasma pressure states. (author)

  14. Studies of a modular advanced stellarator reactor ASRA6C

    International Nuclear Information System (INIS)

    This study is directed towards the clarification of critical issues of advanced modular stellerator reactors exploiting the inherent potential of steady state operation, and is not a point design study of a reactor. Critical technology issues arise from the three-dimensional magnetic field structure. The first wall, blanket and shield are more complex than those of axi-symmetric systems, but this is eased at moderate to large aspect ratio typical of stellarators. Several blanket options have been studied and a thin blanket (21 cm) was the first choice for the design. Superconducting modular coils were investigated with respect to the conductor and mechanical supports. From the analysis of forces and stresses caused by the electromagnetic loads the coils are considered to be feasible, although shear stresses might pose a critical issue. Demountable intermagnetic support elements were designed for use at separation areas between the cryostat modules. A scheme for remote reactor maintenance was also developed. The plasma physics issues of different configurations were studied using extrapolations of transport behaviour and equilibrium from theory and present experiments. These studies indicate that the confinement and equilibrium behaviour is adequate for ignited operation at an average value of 5% beta. Impurities may pose a critical issue. Several impurity control operations were investigated; a pumped limiter configuration utilizing the 'ergodic layer' at the plasma edge was chosen for edge plasma and impurity control. A general conclusion of the study is that the modular stellerator configuration offers interesting prospects regarding the development towards steady-state reactors. (orig.)

  15. interactive compass

    CERN Multimedia

    The magnetic force is carried across the gap between the magnet and the compass needle by photons. Photons are the particles that electromagnetic radiation is made of, such as x-rays, light and microwaves.

  16. The COMPASS Project

    Science.gov (United States)

    Duley, A. R.; Sullivan, D.; Fladeland, M. M.; Myers, J.; Craig, M.; Enomoto, F.; Van Gilst, D. P.; Johan, S.

    2011-12-01

    The Common Operations and Management Portal for Airborne Science Systems (COMPASS) project is a multi-center collaborative effort to advance and extend the research capabilities of the National Aeronautics and Space Administration's (NASA) Airborne Science Program (ASP). At its most basic, COMPASS provides tools for visualizing the position of aircraft and instrument observations during the course of a mission, and facilitates dissemination, discussion, and analysis and of multiple disparate data sources in order to more efficiently plan and execute airborne science missions. COMPASS targets a number of key objectives. First, deliver a common operating picture for improved shared situational awareness to all participants in NASA's Airborne Science missions. These participants include scientists, engineers, managers, and the general public. Second, encourage more responsive and collaborative measurements between instruments on multiple aircraft, satellites, and on the surface in order to increase the scientific value of these measurements. Fourth, provide flexible entry points for data providers to supply model and advanced analysis products to mission team members. Fifth, provide data consumers with a mechanism to ingest, search and display data products. Finally, embrace an open and transparent platform where common data products, services, and end user components can be shared with the broader scientific community. In pursuit of these objectives, and in concert with requirements solicited by the airborne science research community, the COMPASS project team has delivered a suite of core tools intended to represent the next generation toolset for airborne research. This toolset includes a collection of loosely coupled RESTful web-services, a system to curate, register, and search, commonly used data sources, end-user tools which leverage web socket and other next generation HTML5 technologies to aid real time aircraft position and data visualization, and an

  17. Studies of a modular advanced stellarator reactor ASRA6C

    International Nuclear Information System (INIS)

    This study is directed towards the clarification of critical issues of advanced modular stellerator reactors exploiting the inherent potential of steady state operation, and is not a point design study of a reactor. Critical technology issues arise from the three-dimensional magnetic field structure. The first wall, blanket and shield are more complex than those of axi-symmetric systems, but this is eased at moderate to large aspect ratio typical of stellerators. Several blanket options have been studied and a thin blanket (21 cm) was the first choice for the design. Superconducting modular coils were investigated with respect to the conductor and mechanical supports. From the analysis of forces and stresses caused by the electromagnetic loads the coils are considered to be feasible, although shear stresses might pose a critical issue. Demountable intermagnetic support elements were designed for use at separation areas between the cryostat modules. A scheme for remote reactor maintenance was also developed. The plasma physics issues of different configurations were studied using extrapolations of transort behaviour and equilibrium from theory and present experiments. These studies indicate that the confinement and equilibrium behaviour is adequate for ignited operation at an average value of 5% beta. Impurities may pose a critical issue. Several impurity control operations were investigated; a pumped limiter configuration utilizing the 'ergodic layer' at the plasma edge was chosen for edge plasma and impurity control. A general conclusion of the study is that the modular stellerator configuration offers interesting prospects regarding the development towards steady-state reactors. (orig.)

  18. Compassion fatigue in nurses.

    Science.gov (United States)

    Yoder, Elizabeth A

    2010-11-01

    Compassion fatigue, trigger situations, and coping strategies were investigated in hospital and home care nurses. The Professional Quality of Life Scale measured compassion fatigue, compassion satisfaction, and burnout. Narrative questions elicited trigger situations and coping strategies. Compassion fatigue scores were significantly different between nurses who worked 8- or 12-hour shifts. Fifteen percent of the participants had scores indicating risk of the compassion fatigue. There were significant differences in compassion satisfaction, depending on the unit worked and time as a nurse. The most common category of trigger situations was caring for the patient. Work-related and personal coping strategies were identified. PMID:21035028

  19. The COMPASS experiment

    CERN Multimedia

    2006-01-01

    Artistic view of the 60 m long Common Muon and Proton Apparatus for Structure and Spectroscopy (COMPASS) experiment. COMPASS takes beams from the SPS accelerator at CERN. This beam enters from the lower left and passes through the cylindrical target solenoid. COMPASS is used to study the internal structure of hadrons (composite particles interacting via the strong force) by looking at a property called spin and a phenomenon known as glueballs.

  20. The Evolution of Advanced Merger (U)LIRGs on the Color-Stellar Mass Diagram

    CERN Document Server

    Guo, Rui; Xia, Xiao-Yang

    2016-01-01

    Based on a sample of 79 local advanced merger (adv-merger) (U)LIRGs, we search for the evidence of quenching process by investigating the distributions of the star formation history indicators (EW(H$\\alpha$), EW(H$\\delta$$_A$) and D$_n(4000)$) on the NUV-r color-mass and SFR-$M_{\\ast}$ diagrams. The distributions of the EW(H$\\alpha$) and D$_n(4000)$ on the NUV-r color-mass diagram show clear trends that at a given stellar mass, galaxies with redder NUV-r colors have smaller EW(H$\\alpha$) and larger D$_n(4000)$. The reddest adv-merger (U)LIRGs close to the green valley have D$_n(4000)$$>1.4$ mostly. In addition, in the SFR-$M_{\\ast}$ diagram, as the SFR decreases, the EW(H$\\alpha$) decreases and the D$_n(4000)$ increases, implying that the adv-merger (U)LIRGs on the star formation main sequence have more evolved stellar populations than those above the main sequence. These results indicate that a fraction of the adv-merger (U)LIRGs have already exhibited signs of fading from the starburst phase and that the NU...

  1. The Evolution of Advanced Merger (U)LIRGs on the Color-Stellar Mass Diagram

    Science.gov (United States)

    Guo, Rui; Hao, Cai-Na; Xia, Xiao-Yang

    2016-08-01

    Based on a sample of 79 local advanced merger (adv-merger) (U)LIRGs, we search for evidence of quenching processes by investigating the distributions of star formation history indicators (EW(Hα), EW(HΔA) and Dn(4000)) on the NUV-r color-mass and SFR-M * diagrams. The distributions of EW(Hα) and Dn(4000) on the NUV-r color-mass diagram show clear trends that at a given stellar mass, galaxies with redder NUV-r colors have smaller EW(Hα) and larger D n (4000). The reddest adv-merger (U)LIRGs close to the green valley mostly have D n (4000)> 1.4. In addition, in the SFR-M * diagram, as the SFR decreases, the EW(Hα) decreases and the D n (4000) increases, implying that the adv-merger (U)LIRGs on the star formation main sequence have more evolved stellar populations than those above the main sequence. These results indicate that a fraction of the adv-merger (U)LIRGs have already exhibited signs of fading from the starburst phase and that the NUV-r reddest adv-merger (U)LIRGs are likely at the initial stage of post-starbursts with an age of ∼ 1 Gyr, which is consistent with the gas exhaustion time-scales. Therefore, our results offer additional support for the fast evolutionary track from the blue cloud to the red sequence.

  2. The COMPASS experiment

    CERN Multimedia

    Laurent Guiraud

    1999-01-01

    Detail of one of the magnets on the Common Muon and Proton Apparatus for Structure and Spectroscopy (COMPASS) experiment. COMPASS studies the structure of composite particles which interact via the strong force, called hadrons. These have a complicated internal structure due to the nature of their force carriers, gluons, which can form self interacting bunches called glueballs.

  3. Maintaining compassion and preventing compassion fatigue: a practical guide.

    Science.gov (United States)

    Baverstock, Anna Charlotte; Finlay, Fiona Olwen

    2016-08-01

    Compassion is innate in us as human beings. Compassion can be defined as a deep awareness of the suffering of another individual, coupled with the wish to relieve it. It has been increasingly topical, recently, in situations where an apparent breathtaking absence of compassion has allowed great harm to come to patients. So, how do we sustain compassion and prevent this loss? Central to our ability to maintain compassion is how we look after ourselves and those in our teams. PMID:26510446

  4. Compassion Competence in Nurses.

    Science.gov (United States)

    Lee, Youngjin; Seomun, GyeongAe

    2016-01-01

    The purpose of study was to identify the attributes of the concept of compassion competence for nurses. A hybrid model was used to develop the concept, which included fieldwork performed. The concept of compassion competence was found to possess 3 dimensions: (a) acquisition of a wealth of knowledge; (b) development of skills of emotional communication, sensitivity, insight, and self-regulation; and (c) development of attitudes of respect and empathy, and maintenance of occupational distance. Compassion competence could be useful for developing ways to enhance the knowledge, skills, and attitudes required for nurses to provide compassionate care in various nursing practices. PMID:27149235

  5. COMPASS RICH-1

    International Nuclear Information System (INIS)

    RICH-1 is one of the key detectors of the COMPASS experiment at CERN. It is a large acceptance gaseous RICH, designed to perform π/κ separation up to 60 GeV/c. All RICH-1 components are built, most of them have been commissioned during year 2000 COMPASS technical run and the detector will be completed during Spring 2001. We give a description of the detector and report about various technological achievements required by this challenging project

  6. Design and Implementation of Advanced Search System based on the Compass Framework%基于Compass框架的高级搜索系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    陶镇威; 周雨程

    2011-01-01

    介绍了信息检索的基本过程和高级搜索的概念,探讨了如何在全文检索的基础上实现更个性化的高级搜索的方法。利用Lucene技术和Compass框架设计实现了一个高级搜索系统,为如何在Java应用程序中加入高级搜索功能提供了参考。%This paper introduces the processing of information searching and gives the concept of advanced search.It also approaches how to design an advanced search system.Finally,an advanced search system based on Lucene technology and compass framewok is designed,and developed to provide references for simplifying integration of search into any Java application.

  7. Advanced Design of a Novel Stellarator Using the Free Boundary VMEC Magnetic Equilibrium Code. Final Technical Report for period March 1, 1999 - February 28, 2002

    International Nuclear Information System (INIS)

    This report describes the goals and accomplishments of a 3-year EPSCoR Laboratory Partnership award to design an advanced stellarator device for magnetic confinement of toroidal plasmas for fusion research

  8. Larger Angles For COMPASS

    CERN Multimedia

    2006-01-01

    A new magnet at CERN is going to allow COMPASS (Common Muon Proton Apparatus for Structure and Spectroscopy) maximum acceptance. Thanks to the 5 tonne, 2.5 m long magnet, which arrived last December, many more events are expected compared to the previous data-taking.

  9. New results from COMPASS

    CERN Document Server

    Kabuß, Eva-Maria

    2015-01-01

    An overview on recent COMPASS results is given, including the extraction of the longitudinal spin structure functions interpreted with a NLO QCD fit, new results on the gluon polarisation and a measurement of pion and kaon multiplicities with a LO extraction of quark-to-hadron fragmentation functions

  10. 78 FR 35073 - Compass Efficient Model Portfolios, LLC and Compass EMP Funds Trust; Notice of Application

    Science.gov (United States)

    2013-06-11

    ... COMMISSION Compass Efficient Model Portfolios, LLC and Compass EMP Funds Trust; Notice of Application June 4.... Applicants: Compass Efficient Model Portfolios, LLC (the ``Adviser'') and Compass EMP Funds Trust (``the... are Compass EMP U.S. 500 Volatility Weighted Fund, Compass EMP U.S. Small Cap 500 Volatility...

  11. Stellar Populations

    Science.gov (United States)

    Peletier, Reynier F.

    2013-10-01

    This is a summary of my lectures during the 2011 Canary Islands Winter School in Puerto de la Cruz. I give an introduction to the field of stellar populations in galaxies, and highlight some new results. Since the title of the Winter School is Secular Evolution in Galaxies I mostly concentrate on nearby galaxies, which are best suited to study this theme. Of course, the understanding of stellar populations is intimately connected to understanding the formation and evolution of galaxies, one of the great outstanding problems of astronomy. We are currently in a situation where very large observational advances have been made in recent years. Galaxies have been detected up to a redshift of ten. A huge effort has to be made so that stellar population theory can catch up with observations. Since most galaxies are far away, information about them has to come from stellar population synthesis of integrated light. Here I will discuss how stellar evolution theory, together with observations in our Milky Way and Local Group, are used as building blocks to analyse these integrated stellar populations.

  12. Sun compass integration of skylight cues in migratory monarch butterflies.

    Science.gov (United States)

    Heinze, Stanley; Reppert, Steven M

    2011-01-27

    Migrating monarch butterflies (Danaus plexippus) use a time-compensated sun compass to navigate from eastern North America to their overwintering grounds in central Mexico. Here we describe the neuronal layout of those aspects of the butterfly's central complex likely to establish part of the internal sun compass and find them highly homologous to those of the desert locust. Intracellular recordings from neurons in the monarch sun compass network reveal responses tuned to specific E-vector angles of polarized light, as well as azimuth-dependent responses to unpolarized light, independent of spectral composition. The neural responses to these two stimuli in individual neurons are mediated through different regions of the compound eye. Moreover, these dual responses are integrated to create a consistent representation of skylight cues in the sun compass throughout the day. The results advance our understanding of how ambiguous sensory signals are processed by the brain to elicit a robust behavioral response. PMID:21262471

  13. Compassion fatigue: a nurse's primer.

    Science.gov (United States)

    Lombardo, Barbara; Eyre, Caryl

    2011-01-01

    Most nurses enter the field of nursing with the intent to help others and provide empathetic care for patients with critical physical, mental, emotional, and spiritual needs. Empathic and caring nurses, however, can become victims of the continuing stress of meeting the often overwhelming needs of patients and their families, resulting in compassion fatigue. Compassion fatigue affects not only the nurse in terms of job satisfaction and emotional and physical health, but also the workplace environment by decreasing productivity and increasing turnover. We begin this article with a case study of a reactive nurse who did not seek help for her continuing stress. This is followed by a review of Watson's theoretical perspective related to compassion fatigue. Next we delineate symptoms of, and describe interventions for addressing compassion fatigue. We conclude by presenting a case study of a proactive nurse who avoided developing compassion fatigue and a discussion of future research needed to better prevent and ameliorate compassion fatigue. PMID:21800934

  14. Compassion Teaching To Students

    Institute of Scientific and Technical Information of China (English)

    尹华东

    2004-01-01

    Compassion,which brings with it the sensitivity to the pain of other living beings could transform the way the world functions.But the educational system is trying to make students conform to a single standard.Children are not the same physically,emotionally or intellectually.Education must be designed so that it conforms to the needs of each student, because it is an unrealistic dream to think that all children are the same.Anxiety(mental pain)or depression aren't mental diseases but feelings which give us feed back about our lives,the conditions of our relationships and the pressures placed upon us by the society.It is my belief that such an education system would remove the need to drug student.Emotional Literacy Education is the teaching of compassion to every child.

  15. 'The research compass'

    DEFF Research Database (Denmark)

    Ringsted, Charlotte; Hodges, Brian; Scherpbier, Albert

    2011-01-01

    , 'The research compass'. Core to the model is the conceptual, theoretical framework that is the key to any direction. The compass depicts four main categories of research approaches that can be applied when studying medical education phenomena, 'Explorative studies'; 'Experimental studies......This AMEE Guide offers an introduction to research in medical education. It is intended for those who are contemplating conducting research in medical education but are new to the field. The Guide is structured around the process of transforming ideas and problems into researchable questions......, choosing a research approach that is appropriate to the purpose of the study and considering the individual researcher's preferences and the contextual possibilities and constraints. The first section of the Guide addresses the rationale for research in medical education and some of the challenges posed by...

  16. The Mouse Magnetic Compass

    OpenAIRE

    Arnold, Tessa Jean

    2015-01-01

    All five classes of vertebrates use the geomagnetic field for spatial orientation. The geomagnetic field can be used to derive both 'map' and 'compass' information. There is evidence for two different mechanisms used to sense the magnetic field, the radical pair mechanism (RPM) and the magnetite based mechanism (MBM). C57BL/6 laboratory mice can rely on directional information from the magnetic field to position their nests and to solve a water maze task. The primary objective of this...

  17. COMPASS spins in new directions

    CERN Multimedia

    Katarina Anthony

    2012-01-01

    The COMPASS experiment is preparing for a new phase in its physics programme: COMPASS-II. Due to start in 2014, COMPASS-II will bring a powerful new look at the building blocks of protons: quarks and gluons.     The COMPASS installation.   It’s an exciting and busy time for COMPASS. As one of the few experiments in the world capable of studying the internal structure of protons with high precision, COMPASS uses secondary beams from the SPS accelerator to study a variety of quark and gluon properties. This includes their distribution within nucleons, their contribution to nucleon spin and the way they form hadrons when pulled out from the nucleon - all properties that may also improve the understanding of proton collisions in the LHC. In 2014, a new chapter will begin for the COMPASS collaboration. “We have two new phases planned for COMPASS-II,” explains Fabienne Kunne, COMPASS co-spokesperson. “The first will begin in 2014, collidi...

  18. Recent Advances in Design and R(and)D for the Quasi-Poloidal Stellarator Experiment

    International Nuclear Information System (INIS)

    The Quasi-Poloidal Stellarator (QPS), currently in the R(and)D and prototype construction phase, is a very-low-aspect-ratio (R/a = 2.3, 1/2-1/4 that of existing stellarators), compact stellarator experiment with a non-axisymmetric, near-poloidally-symmetric magnetic field that is more like a linked-mirror configuration than the axisymmetry of other toroidal experiments. The QPS design parameters are = 0.9 m, = 0.3-0.4 m, B 1 T, a 1.5-s pulse length, and 3-5 MW of ECH and ICRF heating power. The stellarator core consists of a set of modular coils that provide the primary magnetic field configuration, auxiliary coils including vertical field and toroidal field coils, machine structure, and an external vacuum vessel. The modular coils represent the most difficult part of the core design and fabrication and require the most innovation. The coil set has two field periods with 10 modular coils per period and is placed inside an external cylindrical, domed vacuum vessel. The coils are made of internally cooled, flexible copper cable conductor wound on a cast, precision-machined stainless-steel structural winding form and vacuum impregnated with a high-temperature cyanate ester resin. A 3.5-tonne prototype modular coil winding form was cast using a patternless process (machining the sand mold) that resulted in a superior casting with far fewer major weld repairs than a conventional sand casting. The coil form also provides the support features that allow the coils to be connected into an integral structure. The internal cooling tube of the cable conductor is filled with a low-melting-temperature eutectic, which avoids crushing the cooling tube during cable manufacture and winding. The external vacuum vessel avoids the need to fabricate a complex-shaped vacuum vessel in sections, slipping complex-shaped nonplanar coils over the vessel with toroidally varying cross section, and welding a large number of vessel port extensions. However, the modular coil set is in the same

  19. Stellar Populations

    CERN Document Server

    Peletier, Reynier

    2012-01-01

    This is a summary of my lectures during the 2011 IAC Winter School in Puerto de la Cruz. I give an introduction to the field of stellar populations in galaxies, and highlight some new results. Since the title of the Winter School was {\\it Secular Evolution of Galaxies} I mostly concentrate on nearby galaxies, which are best suited to study this theme. Of course, the understanding of stellar populations is intimately connected to understanding the formation and evolution of galaxies, one of the great outstanding problems of astronomy. We are currently in a situation where very large observational advances have been made in recent years. Galaxies have been detected up to a redshift of 10. A huge effort has to be made so that stellar population theory can catch up with observations. Since most galaxies are far away, information about them has to come from stellar population synthesis of integrated light. Here I will discuss how stellar evolution theory, together with observations in our Milky Way and Local Group...

  20. Recent advances in design and R and D for the Quasi-Poloidal Stellarator experiment

    International Nuclear Information System (INIS)

    Engineering innovation is required to reduce cost and risk in fabrication for the Quasi-Poloidal Stellarator being developed to test key physics issues at very low plasma aspect ratio. Complex, highly accurate, stainless steel modular coil winding forms are cast and machined; conductor is wound directly onto the winding forms; a vacuum-tight cover is welded over each coil pack; the coils are vacuum pressure impregnated; the completed coils are installed in an external vacuum vessel. An internally cooled, compacted cable conductor that can be wound into complex 3-D shapes was developed. The largest and most complex of the winding forms has been cast using a patternless process (machined sand molds) and a high-temperature pour. The resulting casting required <1/10 the major weld repairs of similar sand castings using conventional patterns. As a result, QPS differs significantly in design and construction from other toroidal devices

  1. [Compassion fatigue: a concept analysis].

    Science.gov (United States)

    Fu, Chia-Yun; Chen, Hsing-Mei

    2011-04-01

    Compassion fatigue is a relatively new term in nursing. This term describes mood swings experienced by healthcare providers that are both complex in origin and intensify over time due to cumulative stress. Quality of care can be affected if compassion fatigue goes untreated. This paper presents a concept analysis of compassion fatigue using Walker & Avant's method. Results show the defining attributes of compassion fatigue to include: 1. accumulated patient and family suffering; 2. sufferer unable to release built-up stresses effectively; and 3. negative effects on physical, psychological, and spiritual health. Identified antecedents of compassion fatigue included: (1) working as a healthcare provider; (2) investing sympathy in others over a long period of time; and (3) ignoring stress symptoms and personal emotional needs over time. Identified consequences of compassion fatigue included: (1) decreased coping ability; (2) damage / destruction of patient relationship; and (3) increased medical care costs. This study conducted a concept analysis to offer a better understanding of the concept of compassion fatigue and provide a reference for nursing practice and compassion fatigue-related nursing research. PMID:21455900

  2. Delta G from Compass

    OpenAIRE

    Kurek, Krzysztof

    2006-01-01

    Measurements of the gluon polarization $\\frac{\\Delta G}{G}$ via the open charm channel and based on the helicity asymmetry of large transverse-momentum hadrons in the final state are presented. The data have been collected in the years 2002-2004 by the COMPASS experiment at CERN using a 160 GeV/c polarized muon beam scattered off a polarized $^6$LiD target. The new result for $\\frac{\\Delta G}{G}$ from the charm channel is $-0.57 \\pm 0.41 (stat.)$ at $x_G \\simeq 0.15$ and scale $\\mu^2 \\simeq 1...

  3. Solar and Stellar Dynamos Saas-Fee Advanced Course 39 Swiss Society for Astrophysics and Astronomy

    CERN Document Server

    2013-01-01

    Astrophysical dynamos are at the heart of cosmic magnetic fields of a wide range of scales, from planets and stars to entire galaxies. This book presents a thorough, step-by-step introduction to solar and stellar dynamos. Looking first at the ultimate origin of cosmic seed magnetic fields, the antagonists of field amplification are next considered: resistive decay, flux expulsion, and flows ruled out by anti-dynamo theorems. Two kinematic flows that can act as dynamos are then studied: the Roberts cell and the CP-flow. Mean-field electrodynamics and derivation of the mean-field dynamo equations lead to the alpha Omega-dynamo, the flux transport dynamo, and dynamos based on the Babcock-Leighton mechanism. Alternatives to the mean-field theory are also presented, as are global MHD dynamo simulations. Fluctuations and grand minima in the solar cycle are discussed in terms of dynamo modulations through stochastic forcing and nonlinear effects. The book concludes with an overview of the major challenges in underst...

  4. Meson Spectroscopy at COMPASS

    CERN Document Server

    Grube, Boris

    2015-01-01

    The COmmon Muon and Proton Apparatus for Structure and Spectroscopy (COMPASS) is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron (SPS) aimed at studying the structure and spectrum of hadrons. The two-stage spectrometer has a good acceptance for charged as well as neutral particles over a wide kinematic range and thus allows to access a wide range of reactions. Light mesons are studied with negative (mostly $\\pi^-$) and positive ($p$, $\\pi^+$) hadron beams with a momentum of 190 GeV/$c$. The spectrum of light mesons is investigated in various final states produced in diffractive dissociation reactions at squared four-momentum transfers to the target between 0.1 and 1.0 $(\\text{GeV}/c)^2$. The flagship channel is the $\\pi^-\\pi^+\\pi^-$ final state, for which COMPASS has recorded the currently largest data sample. These data not only allow to measure the properties of known resonances with high precision, but also to search for new states. Among these is a new resonance-like signal, t...

  5. Meson Spectroscopy at COMPASS

    CERN Document Server

    ,

    2016-01-01

    The goal of the COMPASS experiment at CERN is to study the structure and dynamics of hadrons. The two-stage spectrometer used by the experiment has large acceptance and covers a wide kinematic range for charged as well as neutral particles and can therefore measure a wide range of reactions. The spectroscopy of light mesons is performed with negative (mostly $\\pi^-$) and positive ($p$, $\\pi^+$) hadron beams with a momentum of 190 GeV/$c$. The light-meson spectrum is measured in different final states produced in diffractive dissociation reactions with squared four-momentum transfer $t$ to the target between 0.1 and 1.0 $(\\text{GeV}/c)^2$. The flagship channel is the $\\pi^-\\pi^-\\pi^+$ final state, for which COMPASS has recorded the currently world's largest data sample. These data not only allow to measure the properties of known resonances with high precision, but also to observe new states. Among these is a new axial-vector signal, the $a_1(1420)$, with unusual properties. Novel analysis techniques have been...

  6. The GPD program at COMPASS

    CERN Document Server

    Sandacz, Andrzej

    2015-01-01

    The 160 GeV polarised muon beam available at CERN, with positive or negative charge, makes COMPASS a unique place for GPD studies. The first GPD related COMPASS results come from exclusive vector meson production on transversely polarised protons and deuterons. The data were taken in 2003-2010 with large solid-state polarised targets, although without detection of recoil particles. Results on various transverse target spin dependent azimuthal asymmetries are presented and their relations to GPDs are discussed. The dedicated COMPASS GPD program started in 2012 with commissioning of a new long liquid hydrogen target and new detectors such as the large recoil proton detector and the large-angle electromagnetic calorimeter. It was followed by a short pilot 'DVCS run'. The performance of the setup and first results on DVCS and exclusive $\\pi ^0$ channels have been demonstrated. The full data taking for the GPD program approved within COMPASS-II proposal is planned for 2016 and 2017.

  7. COMPASS: getting ready to go !

    CERN Multimedia

    2002-01-01

    The COMPASS experiment in building 888 has started running, after several tests made last year. It will basically investigate the structure and spectroscopy of hadrons and is scheduled to run beyond the start of the LHC.

  8. New COMPASS DAQ

    International Nuclear Information System (INIS)

    This contribution focuses on the deployment and first results of the new FPGA-based data acquisition system (DAQ) of the COMPASS experiment. Since 2002, the number of channels increased to approximately 300000, trigger rate increased to 30 kHz; the average event size remained roughly 35 kB. In order to handle the increased data rates, the new DAQ system with custom FPGA based data handling cards (DHC) had been decided to replace the event building network. The DHCs are equipped with 16 high speed serial links, 2GB of DDR3 memory with bandwidth of 6 GB/s, Gigabit Ethernet connection, and COMPASS Trigger Control System. It uses two different firmware versions: multiplexer and switch. The multiplexer DHC can combine 15 incoming links into one outgoing, whereas the switch combines 8 data streams from multiplexers and using information from look-up table sends the full events to the readout engine servers equipped by spillbuffer PCI-Express cards that receive the data. Both types of DHC can buffer data which allows to distribute the load over the cycle of accelerator. For the purposes of configuration, run control, and monitoring, software tools are developed. Communication between processes in the system is implemented using the DIM library. The DAQ is fully configurable from the web interface. New DAQ system has been deployed for the pilot run starting from the September 2014. In the poster, the preliminary performance and stability results of the new DAQ are presented and compared with the original system in more detail.

  9. Stellar evolution

    CERN Document Server

    Meadows, A J

    2013-01-01

    Stellar Evolution, Second Edition covers the significant advances in the understanding of birth, life, and death of stars.This book is divided into nine chapters and begins with a description of the characteristics of stars according to their brightness, distance, size, mass, age, and chemical composition. The next chapters deal with the families, structure, and birth of stars. These topics are followed by discussions of the chemical composition and the evolution of main-sequence stars. A chapter focuses on the unique features of the sun as a star, including its evolution, magnetic fields, act

  10. Compassion and professional care: exploring the domain.

    Science.gov (United States)

    van der Cingel, Margreet

    2009-04-01

    Compassion unites people during times of suffering and distress. Unfortunately, compassion cannot take away suffering. Why then, is compassion important for people who suffer? Nurses work in a domain where human suffering is evidently present. In order to give meaning to compassion in the domain of professional care, it is necessary to describe what compassion is. The purpose of this paper is to explore questions and contradictions in the debate on compassion related to nursing care. The paper reviews classical philosophers as well as contemporary scientists' main arguments on compassion. First, I will examine the relationship between compassion and suffering. Second, how does one recognize serious suffering? This issue raises questions about the role of imagination and the need for identification. Third, literature describes compassion as an emotion. Some philosophers consider emotions uncontrollable feelings; others see a clear rational dimension in emotions. In order to determine what compassion is, it is necessary to weigh these contradictional arguments. Fourth, I will discuss motives for compassion. Is compassion an act of altruism or egoism? In this debate Nietzsche and Schopenhauer are well-known opponents. Today, analysis of their arguments leads to some surprising conclusions. Fifth, there is the issue of fault and compassion. Can we only feel compassionate when people who suffer are not to blame for their own suffering? Such a condition faces professional caretakers with a dilemma which needs a thorough analysis if compassion is to be of use in the field of professional care. Finally, I will explore the moral meaning of compassion. Compassion, described as a concept with cognitive as well as affective dimensions, also has volitional and behavioural aspects. These aspects specifically are of importance to nursing care and further research of compassion in the nursing domain. PMID:19291200

  11. Self-Compassion and Interpersonal Cognitive Distortions

    Science.gov (United States)

    Akin, Ahmet

    2010-01-01

    The purpose of this study is to examine the relationships between self-compassion and interpersonal cognitive distortions. Participants were 338 university students. In this study, the Self-compassion Scale and the Interpersonal Cognitive Distortions Scale were used. The relationships between self-compassion and interpersonal cognitive distortions…

  12. Rousseau and the Education of Compassion

    Science.gov (United States)

    White, Richard

    2008-01-01

    In this paper I examine Rousseau's strategy for teaching compassion in "Book Four of Emile." In particular, I look at the three maxims on compassion that help to organise Rousseau's discussion, and the precise strategy that Emile's tutor uses to instil compassion while avoiding other passions, such as anger, fear and pride. The very idea of an…

  13. A protocol for an exploratory phase I mixed-methods study of enhanced integrated care for care home residents with advanced dementia: the Compassion Intervention

    OpenAIRE

    Elliott, M.; Harrington, J.; Moore, K.; Davis, S.; Kupeli, N.; Vickerstaff, V.; Gola, A; Candy, B; Sampson, E. L.; Jones, L.

    2014-01-01

    Introduction In the UK approximately 700 000 people are living with, and a third of people aged over 65 will die with, dementia. People with dementia may receive poor quality care towards the end of life. We applied a realist approach and used mixed methods to develop a complex intervention to improve care for people with advanced dementia and their family carers. Consensus on intervention content was achieved using the RAND UCLA appropriateness method and mapped to sociological theories of p...

  14. Charmed hadron photoproduction at COMPASS

    Directory of Open Access Journals (Sweden)

    Wang Xiao-Yun

    2016-06-01

    Full Text Available Photoproduction of the charmonium-like state Zc(4200 and the charmed baryon Λc*$\\it\\Lambda _c^*$(2940 is investigated with an effective Lagrangian approach and the Regge trajectories applying to the COMPASS experiment. Combining the experimental data from COMPASS and our theoretical model we estimate the upper limit of ΓZc(4200→J/ψπ to be of about 37 MeV. Moreover, the possibility to produce Λc*$\\it\\Lambda _c^*$ (2940 at COMPASS is discussed. It seems one can try to search for this hadron in the missing mass spectrum since the t-channel is dominating for the Λc*$\\it\\Lambda _c^*$(2940 photoproduction.

  15. Charmed hadron photoproduction at COMPASS

    CERN Document Server

    Wang, Xiao-Yun

    2016-01-01

    Photoproduction of the charmonium-like state $Z_{c}(4200)$ and the charmed baryon $\\Lambda_{c}^{\\ast }(2940)$ is investigated with an effective Lagrangian approach and the Regge trajectories applying to the COMPASS experiment. Combining the experimental data from COMPASS and our theoretical model we estimate the upper limit of $\\Gamma_{Z_{c}(4200)\\rightarrow J/\\psi \\pi }$ to be of about 37 MeV. Moreover, the possibility to produce $\\Lambda_{c}^{\\ast }(2940)$ at COMPASS is discussed. It seems one can try to search for this hadron in the missing mass spectrum since the $t$-channel is dominating for the $\\Lambda_{c}^{\\ast }(2940)$ photoproduction.

  16. The GPD program at COMPASS

    CERN Document Server

    Sznadjer, Pawel

    2014-01-01

    In this paper we summarize recent measurements of exclusive reactions at COMPASS, which are a part of the GPD program. New results on the transverse target spin asymmetries for exclusive 0 production are presented. Some of these asymmetries are sensitive to the GPDs E , which are related to the orbital angular momentum of quarks. Other asymmetries are sensitive to the chiral-odd, transverse GPDs H T . Planned measurements of Deeply Virtual Compton Scattering, which are a part of the approved COMPASS-II proposal, are also discussed. The main aim of these measurements is access to the GPDs H , which are related to the 3-dimensional nucleon tomography.

  17. Compassion fatigue in pediatric palliative care providers.

    Science.gov (United States)

    Rourke, Mary T

    2007-10-01

    The experience of compassion fatigue is an expected and common response to the professional task of routinely caring for children at the end of life. Symptoms of compassion fatigue often mimic trauma reactions. Implementing strategies that span personal, professional, and organizational domains can help protect health care providers from the damaging effects of compassion fatigue. Providing pediatric palliative care within a constructive and supportive team can help caregivers deal with the relational challenges of compassion fatigue. Finally, any consideration of the toll of providing pediatric palliative care must be balanced with a consideration of the parallel experience of compassion satisfaction. PMID:17933615

  18. JET and COMPASS asymmetrical disruptions

    Czech Academy of Sciences Publication Activity Database

    Gerasimov, S.N.; Abreu, P.; Baruzzo, M.; Drozdov, V.; Dvornova, A.; Havlíček, Josef; Hender, T.C.; Hronová-Bilyková, Olena; Kruezi, U.; Li, X.; Markovič, Tomáš; Pánek, Radomír; Rubinacci, G.; Tsalas, M.; Ventre, S.; Villone, F.; Zakharov, L.E.

    2015-01-01

    Roč. 55, č. 11 (2015), s. 113006-113006. ISSN 0029-5515 R&D Projects: GA MŠk(CZ) LM2011021 Institutional support: RVO:61389021 Keywords : tokamak * asymmetrical disruption * JET * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 3.062, year: 2014

  19. Algorithms onboard the Oersted micro satellite stellar compass

    DEFF Research Database (Denmark)

    Liebe, Carl Christian; Jørgensen, John Leif

    powerful microcomputer. The microcomputer analyses the CCD images using an onboard software star catalogue. The objective of the danish Oersted microsatellite is to measure the magnetic field of the Earth. The field is measured with a very accurate vector magnetometer. In order to utilize the accurate...

  20. Algorithms onboard the Oersted micro satellite stellar compass

    DEFF Research Database (Denmark)

    Liebe, Carl Christian; Jørgensen, John Leif

    1996-01-01

    and a powerful microcomputer. The microcomputer analyses the CCD images using an onboard software star catalogue. The objective of the danish Oersted microsatellite is to measure the magnetic field of the Earth. The field is measured with a very accurate vector magnetometer. In order to utilize the accurate...

  1. Exploring compassion: a meta-analysis of the association between self-compassion and psychopathology

    OpenAIRE

    MacBeth, A.; Gumley, A.

    2012-01-01

    Compassion has emerged as an important construct in studies of mental health and psychological therapy. Although an increasing number of studies have explored relationships between compassion and different facets of psychopathology there has as yet been no systematic review or synthesis of the empirical literature. We conducted a systematic search of the literature on compassion and mental health. We identified 20 samples from 14 eligible studies. All studies used the Neff Self Compassion Sca...

  2. Lateralization of magnetic compass orientation in pigeons

    OpenAIRE

    Wilzeck, Christiane; Wiltschko, Wolfgang; Güntürkün, Onur; Wiltschko, Roswitha; Prior, Helmut

    2010-01-01

    The aim of our study was to test for lateralization of magnetic compass orientation in pigeons. Having shown that pigeons are capable of learning magnetic compass directions in an operant task, we wanted to know whether the brain hemispheres contribute differently and how the lateralization pattern relates to findings in other avian species. Birds that had learnt to locate food in an operant chamber by means of magnetic directions were tested for lateralization of magnetic compass orientation...

  3. A magnetic compass aids monarch butterfly migration

    OpenAIRE

    Guerra, Patrick A; Gegear, Robert J; Reppert, Steven M.

    2014-01-01

    Convincing evidence that migrant monarch butterflies (Danaus plexippus) use a magnetic compass to aid their fall migration has been lacking from the spectacular navigational capabilities of this species. Here we use flight simulator studies to show that migrants indeed possess an inclination magnetic compass to help direct their flight equatorward in the fall. The use of this inclination compass is light-dependent utilizing ultraviolet-A/blue light between 380 and 420 nm. Notably, the signifi...

  4. Compassion: An Evolutionary Analysis and Empirical Review

    OpenAIRE

    Goetz, Jennifer L.; Keltner, Dacher; Simon-Thomas, Emiliana

    2010-01-01

    What is compassion? And how did it evolve? In this review, we integrate three evolutionary arguments that converge on the hypothesis that compassion evolved as a distinct affective experience whose primary function is to facilitate cooperation and protection of the weak and those who suffer. Our empirical review reveals compassion to have distinct appraisal processes attuned to undeserved suffering, distinct signaling behavior related to caregiving patterns of touch, posture, and vocalization...

  5. Chemical compass for bird navigation

    DEFF Research Database (Denmark)

    Solov'yov, Ilia; Hore, Peter J.; Ritz, Thorsten;

    2014-01-01

    Migratory birds travel spectacular distances each year, navigating and orienting by a variety of means, most of which are poorly understood. Among them is a remarkable ability to perceive the intensity and direction of the Earth's magnetic field. Biologically credible mechanisms for the detection...... other relies on the quantum spin dynamics of transient photoinduced radical pairs. Originally suggested by Schulten in 1978 as the basis of the avian magnetic compass sensor, this mechanism gained support from the subsequent observation that the compass is light-dependent. The radical pair hypothesis...... began to attract increased interest following the proposal in 2000 that free radical chemistry could occur in the bird's retina initiated by photoexcitation of cryptochrome, a specialized photoreceptor protein. In the present paper we review the important physical and chemical constraints on a possible...

  6. Pion Polarizabilities at CERN COMPASS

    CERN Document Server

    Moinester, M A

    2002-01-01

    The electric alpha and magnetic beta pion Compton polarizabilities characterize the pion's deformation in the electromagnetic field of the gamma during gamma-pi Compton scattering. The chi_PT effective Lagrangian, using data from radiative pion beta decay, predicts the pion electric and magnetic polarizabilities alpha = -beta = 2.7 +- 0.4. The polarizabilities deduced by Antipov et al. in their low statistics Primakoff experiment (~ 7000 events) were about three times larger than this prediction. For pion polarizability, gamma-pi scattering will be measured in CERN COMPASS via radiative pion Primakoff scattering (pion Bremsstrahlung) in the nuclear Coulomb field: pi + Z --> pi' + gamma + Z; equivalent to gamma + pi --> gamma + pi Compton scattering for laboratory gamma's of order 1 GeV incident on a target pi at rest. The pion polarizabilities are determined by their effect on the shape of the measured gamma-pi Compton scattering angular distribution. One can expect from COMPASS a total measurement uncertaint...

  7. Compassion fatigue and the veterinary health team.

    Science.gov (United States)

    Cohen, Susan P

    2007-01-01

    Although the term "compassion fatigue" is often used interchangeably with the term "burnout", they are two different concepts. Compassion fatigue stems from an overcommitment to work that involves caring for others and is considered by some to be a kind of secondary posttraumatic stress disorder. Because they often invest themselves deeply in the animals they care for, veterinarians, technicians, and other members of an animal health team may be particularly vulnerable to compassion fatigue. This article summarizes the current state of knowledge about compassion fatigue, describes its symptoms, and suggests ways to prevent or overcome it. PMID:17162116

  8. Educational NASA Computational and Scientific Studies (enCOMPASS)

    Science.gov (United States)

    Memarsadeghi, Nargess

    2013-01-01

    Educational NASA Computational and Scientific Studies (enCOMPASS) is an educational project of NASA Goddard Space Flight Center aimed at bridging the gap between computational objectives and needs of NASA's scientific research, missions, and projects, and academia's latest advances in applied mathematics and computer science. enCOMPASS achieves this goal via bidirectional collaboration and communication between NASA and academia. Using developed NASA Computational Case Studies in university computer science/engineering and applied mathematics classes is a way of addressing NASA's goals of contributing to the Science, Technology, Education, and Math (STEM) National Objective. The enCOMPASS Web site at http://encompass.gsfc.nasa.gov provides additional information. There are currently nine enCOMPASS case studies developed in areas of earth sciences, planetary sciences, and astrophysics. Some of these case studies have been published in AIP and IEEE's Computing in Science and Engineering magazines. A few university professors have used enCOMPASS case studies in their computational classes and contributed their findings to NASA scientists. In these case studies, after introducing the science area, the specific problem, and related NASA missions, students are first asked to solve a known problem using NASA data and past approaches used and often published in a scientific/research paper. Then, after learning about the NASA application and related computational tools and approaches for solving the proposed problem, students are given a harder problem as a challenge for them to research and develop solutions for. This project provides a model for NASA scientists and engineers on one side, and university students, faculty, and researchers in computer science and applied mathematics on the other side, to learn from each other's areas of work, computational needs and solutions, and the latest advances in research and development. This innovation takes NASA science and

  9. Cluster storage for COMPASS tokamak

    Energy Technology Data Exchange (ETDEWEB)

    Pisacka, J., E-mail: pisacka@ipp.cas.cz [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Hron, M., E-mail: hron@ipp.cas.cz [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Janky, F., E-mail: jankyf@ipp.cas.cz [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Praha 8 (Czech Republic); Panek, R., E-mail: panek@ipp.cas.cz [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic)

    2012-12-15

    Highlights: Black-Right-Pointing-Pointer New data storage system needed for the COMPASS tokamak. Black-Right-Pointing-Pointer Distributed, fault-tolerant, parallel, scalable, non-proprietary. Black-Right-Pointing-Pointer GlusterFS selected for testing on a small test bed. Black-Right-Pointing-Pointer Aggregated reading throughput reached 300 MiB/s for 6 clients - very good result. - Abstract: The COMPASS tokamak is expected to produce several gigabytes of data per shot in near future. A new storage system is needed to accommodate and access all the data. It should be scalable, fault-tolerant, and parallel. It should not be based on proprietary solutions to maintain independence from hardware and software manufacturers and preferably it should be built on inexpensive commodity hardware. One of the promising distributed parallel fault-tolerant file systems, GlusterFS, was selected for testing. The aim of the work was to make initial tests of a particular small GlusterFS setup to confirm its aptitude for the COMPASS storage system. Aggregated reading throughput from multiple NFS clients was one of the most important figures that were benchmarked, it scaled well with the number of clients, starting just above 60 MiB/s for 1 client and going slightly over 300 MiB/s for 6 clients.

  10. Cluster storage for COMPASS tokamak

    International Nuclear Information System (INIS)

    Highlights: ► New data storage system needed for the COMPASS tokamak. ► Distributed, fault-tolerant, parallel, scalable, non-proprietary. ► GlusterFS selected for testing on a small test bed. ► Aggregated reading throughput reached 300 MiB/s for 6 clients – very good result. - Abstract: The COMPASS tokamak is expected to produce several gigabytes of data per shot in near future. A new storage system is needed to accommodate and access all the data. It should be scalable, fault-tolerant, and parallel. It should not be based on proprietary solutions to maintain independence from hardware and software manufacturers and preferably it should be built on inexpensive commodity hardware. One of the promising distributed parallel fault-tolerant file systems, GlusterFS, was selected for testing. The aim of the work was to make initial tests of a particular small GlusterFS setup to confirm its aptitude for the COMPASS storage system. Aggregated reading throughput from multiple NFS clients was one of the most important figures that were benchmarked, it scaled well with the number of clients, starting just above 60 MiB/s for 1 client and going slightly over 300 MiB/s for 6 clients.

  11. Self-Compassion and Internet Addiction

    Science.gov (United States)

    Iskender, Murat; Akin, Ahmet

    2011-01-01

    The purpose of this research is to examine the relationship of self-compassion and internet addiction. Participants were 261 university students who completed a questionnaire package that included the Self-compassion Scale and the Online Cognition Scale. The hypothesis model was tested through structural equation modeling. In correlation analysis,…

  12. Parallel-End-Point Drafting Compass

    Science.gov (United States)

    Cronander, J.

    1986-01-01

    Parallelogram linkage ensures greater accuracy in drafting and scribing. Two members of arm of compass remain parallel for all angles pair makes with hub axis. They maintain opposing end members in parallelism. Parallelogram-linkage principle used on dividers as well as on compasses.

  13. Compass Games: An Introduction to Orienteering Skills

    Science.gov (United States)

    Sension-Hall, Debra

    2011-01-01

    Compasses are useful tools for teaching the basics of navigation. Knowing where you are, where you are going, and how to get there are important facets of outdoor recreation. Compass games are a fun way to teach introductory navigation skills, and this article describes how they can be used as innovative, nontraditional activities in physical…

  14. The Role of Compassion in Moral Education.

    Science.gov (United States)

    Ruiz, Pedro Ortega; Vallejos, Ramon Minguez

    1999-01-01

    Proposes compassion as a new model for moral education, emphasizing empathy as a foundation for educating for compassion. Argues that socioaffective experiences, acquisition of social skills, and awakening moral awareness are resources that enable the development of empathy. Suggests emotional guidance and observation-based tasks as practical…

  15. The Solar--Stellar Connection

    OpenAIRE

    White, S. M.

    2004-01-01

    Stars have proven to be surprisingly prolific radio sources and the added sensitivity of the Square Kilometer Array will lead to advances in many directions. This chapter discusses prospects for studying the physics of stellar atmospheres and stellar winds across the HR diagram.

  16. Cluster storage for COMPASS tokamak

    Czech Academy of Sciences Publication Activity Database

    Písačka, Jan; Hron, Martin; Janky, Filip; Pánek, Radomír

    2012-01-01

    Roč. 87, č. 12 (2012), s. 2238-2241. ISSN 0920-3796. [IAEA Technical Meeting on Control, Data Acquisition, and Remote Participation for Fusion Research/8./. San Francisco, 20.06.2011-24.06.2011] R&D Projects: GA ČR GAP205/11/2470; GA MŠk 7G10072; GA MŠk(CZ) LM2011021 Institutional research plan: CEZ:AV0Z20430508 Keywords : COMPASS * Tokamak * Codac * Cluster * GlusterFS * Storage Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 0.842, year: 2012 http://dx.doi.org/10.1016/j.fusengdes.2012.09.006

  17. The COMPASS data acquisition system

    CERN Document Server

    Fischer, H; Grünemaier, A; Heinsius, F H; Hoffmann, M; Karstens, F; Kastaun, W; Königsmann, K C; Niebuhr, M; Risken, R; Schmidt, T; Schmitt, H; Schweimler, A; Hodenberg, M V; Urban, H J

    2002-01-01

    A fully pipelined and massively parallel data acquisition system has been developed for the COMPASS experiment at CERN. The main requirements are to read 250000 detector channels at a trigger rate of up to 100 kHz. Such high rates are only possible when using a hit selection mechanism on the front-end combined with dead-time free readout. For this purpose, a time-to-digital converter (TDC) chip has been developed and is used for all time measurement applications in COMPASS. Distributed, field programmable gate array (FPGA)-based readout-driver modules handle parallel front-end initialization, synchronous trigger and control-signal distribution, and local event building at a processing speed of 160 Mbyte/s. Each of the 160 readout-driver modules connects to 16 front-end boards through independent twisted pair cables (CAT 7, 600 MHz) or optical fibers using an industrial (ESCON), self synchronizing link at 40 Mbyte/s. Automatic configuration through unique module and link identification ensures the flexibility ...

  18. Measurement of TMD observables at COMPASS

    Directory of Open Access Journals (Sweden)

    Sbrizzai Giulio

    2014-06-01

    Full Text Available COMPASS is a fixed target experiment at the CERN SPS taking data since 2002. An important part of the physics programme is the study of the spin structure of the nucleon by measuring deep inelastic scattering of high energy muons off polarized or unpolarized nucleons. In particular COMPASS has given and is giving an important contribution to understand the role of parton transverse spin and transverse momentum, a recent topic on which a large international community is working. The most recent COMPASS measurements in this field and their relevance are here reviewed.

  19. A magnetic compass aids monarch butterfly migration.

    Science.gov (United States)

    Guerra, Patrick A; Gegear, Robert J; Reppert, Steven M

    2014-01-01

    Convincing evidence that migrant monarch butterflies (Danaus plexippus) use a magnetic compass to aid their fall migration has been lacking from the spectacular navigational capabilities of this species. Here we use flight simulator studies to show that migrants indeed possess an inclination magnetic compass to help direct their flight equatorward in the fall. The use of this inclination compass is light-dependent utilizing ultraviolet-A/blue light between 380 and 420 nm. Notably, the significance of light migration. PMID:24960099

  20. BUDDHIST PERSPECTIVE OF COMPASSION IN BUDDHIST PSYCHOLOGY

    Directory of Open Access Journals (Sweden)

    Sunanda

    2014-11-01

    Full Text Available -In Buddhist psychology, compassion is a form of empathy. We sense others’ buffering as like our own and naturally wish them deep freedom from it. A compassionate mind, as opposed to a cruel and angry one, is understood to be much more closely attuned to our actual condition. Thus, compassion is informed by the wisdom that understands our basic situation: the inner causes of our suffering and our potential for freedom and goodness. From a Buddhist perspective, compassion with wisdom is the foundation of emotional healing.

  1. Present status of silicon detectors in COMPASS

    CERN Document Server

    Angerer, H; Esposito, A; Friedrich, J M; Gerassimov, S G; Grube, B; Ketzer, B; Konorov, I; Kühn, R; Paul, S; Schmitt, L; Wagner, R M; Wiesmann, M

    2003-01-01

    In 2002 the COMPASS experiment at CERN has started to take first physics data. The fixed target experiment at the SPS uses muon and hadron beams of very high intensity to investigate the structure of the nucleon. For beam definition and small angle tracking silicon microstrip detectors are used. This article describes the requirements which are set by the physics program of COMPASS for these detectors and the ways they were met, amongst which the operation at a temperature around 130 K (Lazarus effect) is the most prominent. Measurements at low temperatures as well as first results from the operation at room temperature in the COMPASS physics run 2002 are presented.

  2. Self-Compassion, Stress, and Coping

    OpenAIRE

    Allen, Ashley Batts; Leary, Mark R.

    2010-01-01

    People who are high in self-compassion treat themselves with kindness and concern when they experience negative events. The present article examines the construct of self-compassion from the standpoint of research on coping in an effort to understand the ways in which people who are high in self-compassion cope with stressful events. Self-compassionate people tend to rely heavily on positive cognitive restructuring but do not appear to differ from less self-compassionate people in the degree ...

  3. Exploring compassion: a meta-analysis of the association between self-compassion and psychopathology.

    Science.gov (United States)

    MacBeth, Angus; Gumley, Andrew

    2012-08-01

    Compassion has emerged as an important construct in studies of mental health and psychological therapy. Although an increasing number of studies have explored relationships between compassion and different facets of psychopathology there has as yet been no systematic review or synthesis of the empirical literature. We conducted a systematic search of the literature on compassion and mental health. We identified 20 samples from 14 eligible studies. All studies used the Neff Self Compassion Scale (Neff, 2003b). We employed meta-analysis to explore associations between self-compassion and psychopathology using random effects analyses of Fisher's Z correcting for attenuation arising from scale reliability. We found a large effect size for the relationship between compassion and psychopathology of r=-0.54 (95% CI=-0.57 to -0.51; Z=-34.02; p<.0001). Heterogeneity was significant in the analysis. There was no evidence of significant publication bias. Compassion is an important explanatory variable in understanding mental health and resilience. Future work is needed to develop the evidence base for compassion in psychopathology, and explore correlates of compassion and psychopathology. PMID:22796446

  4. Highlights from COMPASS in hadron spectroscopy

    CERN Document Server

    Krinner, Fabian

    2015-01-01

    Since Quantum Choromdynamics allows for gluon self-coupling, quarks and gluons cannot be observed as free particles, but only their bound states, the hadrons. This so-called confinement phenomenon is responsible for $98\\%$ of the mass in the visible universe. The measurement of the hadron excitation spectra therefore gives valuable input for theory and phenomenology to quantitatively understand this phenomenon. One simple model to describe hadrons is the Constituent Quark Model (CQM), which knows two types of hadrons: mesons, consisting of a quark and an antiquark, and baryons, which are made out of three quarks. More advanced models, which are inspired by QCD as well as calculations within Lattice QCD predict the existence of other types of hadrons, which may be e.g. described solely by gluonic excitations (glueballs) or mixed quark and gluon excitations (hybrids). In order to search for such states, the COMPASS experiment at the Super Proton Synchrotron at CERN has collected large data sets, which allow to ...

  5. Ombuds’ corner: Ethics and compassion

    CERN Multimedia

    Vincent Vuillemin

    2013-01-01

    We can all agree that efficiency leads excellent results; this is a cornerstone in research and organisational matters. However, people may not unanimously point to which method of management and leadership is best for achieving such a goal.   Some believe in an authoritarian approach, pushing people to their maximum potentials; others advocate a softer approach, making close friends with everyone; and some have no strategy for workplace relationships, and only consider due dates and deliverables. All of these methods can be very effective, but none is completely perfect. Beyond such methods, at the source of working relationships, ethics and compassion should “shine like a lighthouse over the ocean of the tasks to undertake”. Why? When hearing “ethics” and “compassion” linked together, people may think: “Oh! We do not need to like each other; we just have to work together!” But we are the creators of our environ...

  6. Overview of the COMPASS diagnostics

    Czech Academy of Sciences Publication Activity Database

    Weinzettl, Vladimír; Pánek, Radomír; Hron, Martin; Stöckel, Jan; Žáček, František; Havlíček, Josef; Bílková, Petra; Naydenkova, Diana; Háček, Pavel; Zajac, Jaromír; Dejarnac, Renaud; Horáček, Jan; Adámek, Jiří; Mlynář, Jan; Janky, Filip; Aftanas, Milan; Böhm, Petr; Brotánková, Jana; Šesták, David; Ďuran, Ivan; Melich, Radek; Jareš, Daniel; Anda, B.; Veres, G.; Szappanos, A.; Zoletnik, S.; Berta, M.; Shevchenko, V. F.; Scannell, R.; Walsh, D.; Müller, H. W.; Igochine, V.; Silva, A.; Manso, M.; Gomes, R.; Popov, Tsv.; Sarychev, D.; Kiselov, V.K.; Nanobashvili, S.; Ghosh, J.

    2011-01-01

    Roč. 86, 6-8 (2011), s. 1227-1231. ISSN 0920-3796. [Symposium of Fusion Technology (SOFT-26). Porto, 27.09.2010-01.10.2010] R&D Projects: GA ČR GA202/09/1467; GA ČR GA202/08/0419; GA ČR GD202/08/H057; GA AV ČR KJB100430901; GA MŠk 7G09042 Institutional research plan: CEZ:AV0Z20430508 Keywords : plasma diagnostics * tokamak * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 1.490, year: 2011 http://www.sciencedirect.com/science/article/pii/S0920379610005594

  7. Pion polarizabilities measurement at COMPASS

    International Nuclear Information System (INIS)

    The electromagnetic structure of pions is probed in π- + (A, Z) π- + (A, Z) + γ Compton scattering in inverse kinematics (Primakoff reaction) and described by the electric (απ) and the magnetic (βπ) polarizabilities that depend on the rigidity of pion's internal structure as a composite particle. Values for pion polarizabilities can be extracted from the comparison of the differential cross section for scattering of point like pions with the measured cross section. The pion polarizability measurement was performed with a π- beam of 190 GeV. The high beam intensity, the good spectrometer resolution, the high rate capability, the high acceptance and the possibility to use pion and muon beams, unique to the COMPASS experiment, provide the tools to measure precisely the pion polarizabilities in the Primakoff reaction

  8. The COMPASS Experiment at CERN

    CERN Document Server

    Abbon, P.; Alexakhin, V.Yu.; Alexandrov, Yu.; Alexeev, G.D.; Alekseev, M.G.; Amoroso, A.; Angerer, H.; Anosov, V.A.; Badelek, B.; Balestra, F.; Ball, J.; Barth, J.; Baum, G.; Becker, M.; Bedfer, Y.; Berglund, P.; Bernet, C.; Bertini, R.; Bettinelli, M.; Birsa, R.; Bisplinghoff, J.; Bordalo, P.; Bosteels, M.; Bradamante, F.; Braem, A.; Bravar, A.; Bressan, A.; Brona, G.; Burtin, E.; Bussa, M.P.; Bytchkov, V.N.; Chalifour, M.; Chapiro, A.; Chiosso, M.; Ciliberti, P.; Cicuttin, A.; Colantoni, M.; Colavita, A.A.; Costa, S.; Crespo, M.L.; Cristaudo, P.; Dafni, T.; d'Hose, N.; Dalla Torre, S.; d'Ambrosio, C.; Das, S.; Dasgupta, S.S.; Delagnes, E.; De Masi, R.; Deck, P.; Dedek, N.; Demchenko, D.; Denisov, O.Yu.; Dhara, L.; Diaz, V.; Dibiase, N.; Dinkelbach, A.M.; Dolgopolov, A.V.; Donati, A.; Donskov, S.V.; Dorofeev, V.A.; Doshita, N.; Durand, D.; Duic, V.; Dunnweber, W.; Efremov, A.; Eversheim, P.D.; Eyrich, W.; Faessler, M.; Falaleev, V.; Fauland, P.; Ferrero, A.; Ferrero, L.; Finger, M.; Finger, M.; Fischer, H.; Franco, C.; Franz, J.; Fratnik, F.; Friedrich, J.M.; Frolov, V.; Fuchs, U.; Garfagnini, R.; Gatignon, L.; Gautheron, F.; Gavrichtchouk, O.P.; Gerassimov, S.; Geyer, R.; Gheller, J.M.; Giganon, A.; Giorgi, M.; Gobbo, B.; Goertz, S.; Gorin, A.M.; Gougnaud, F.; Grabmuller, S.; Grajek, O.A.; Grasso, A.; Grube, B.; Grunemaier, A.; Guskov, A.; Haas, F.; Hagemann, R.; Hannappel, J.; von Harrach, D.; Hasegawa, T.; Heckmann, J.; Hedicke, S.; Heinsius, F.H.; Hermann, R.; Hess, C.; Hinterberger, F.; von Hodenberg, M.; Horikawa, N.; Horikawa, S.; Horn, I.; Ilgner, C.; Ioukaev, A.I.; Ishimoto, S.; Ivanchin, I.; Ivanov, O.; Iwata, T.; Jahn, R.; Janata, A.; Joosten, R.; Jouravlev, N.I.; Kabuss, E.; Kalinnikov, V.; Kang, D.; Karstens, F.; Kastaun, W.; Ketzer, B.; Khaustov, G.V.; Khokhlov, Yu.A.; Kiefer, J.; Kisselev, Yu.; Klein, F.; Klimaszewski, K.; Koblitz, S.; Koivuniemi, J.H.; Kolosov, V.N.; Komissarov, E.V.; Kondo, K.; Konigsmann, Kay; Konoplyannikov, A.K.; Konorov, I.; Konstantinov, V.F.; Korentchenko, A.S.; Korzenev, A.; Kotzinian, A.M.; Koutchinski, N.A.; Kouznetsov, O.; Kowalik, K.; Kramer, D.; Kravchuk, N.P.; Krivokhizhin, G.V.; Kroumchtein, Z.V.; Kubart, J.; Kuhn, R.; Kukhtin, V.; Kunne, F.; Kurek, K.; Kuzmin, N.A.; Lamanna, M.; Le Goff, J.M.; Leberig, M.; Lednev, A.A.; Lehmann, A.; Levinski, V.; Levorato, S.; Lyashenko, V.I; Lichtenstadt, J.; Liska, T.; Ludwig, I.; Maggiora, A.; Maggiora, M.; Magnon, A.; Mallot, G.K.; Mann, A.; Manuilov, I.V.; Marchand, C.; Marroncle, J.; Martin, A.; Marzec, J.; Masek, L.; Massmann, F.; Matsuda, T.; Matthia, D.; Maximov, A.N.; Menon, G.; Meyer, W.; Mielech, A.; Mikhailov, Yu.V.; Moinester, M.A.; Molinie, F.; Mota, F.; Mutter, A.; Nagel, T.; Nahle, O.; Nassalski, J.; Neliba, S.; Nerling, F.; Neyret, D.; Niebuhr, M.; Niinikoski, T.; Nikolaenko, V.I.; Nozdrin, A.A.; Olshevsky, A.G.; Ostrick, M.; Padee, A.; Pagano, P.; Panebianco, S.; Parsamyan, B.; Panzieri, D.; Paul, S.; Pawlukiewicz, B.; Pereira, H.; Peshekhonov, D.V.; Peshekhonov, V.D.; Piedigrossi, D.; Piragino, G.; Platchkov, S.; Platzer, K.; Pochodzalla, J.; Polak, J.; Polyakov, V.A.; Pontecorvo, G.; Popov, A.A.; Pretz, J.; Procureur, S.; Quintans, C.; Rajotte, J.-F.; Ramos, S.; Razaq, I.; Rebourgeard, P.; Reggiani, D.; Reicherz, G.; Richter, A.; Robinet, F.; Rocco, E.; Rondio, E.; Ropelewski, L.; Rousse, J.Y.; Rozhdestvensky, A.M.; Ryabchikov, D.; Samartsev, A.G.; Samoylenko, V.D.; Sandacz, A.; Merce, M.Sans; Santos, H.; Sapozhnikov, M.G.; Sauli, F.; Savin, Igor A.; Schiavon, P.; Schill, C.; Schmidt, T.; Schmitt, H.; Schmitt, L.; Schonmeier, P.; Schroeder, W.; Seeharsch, D.; Seimetz, M.; Setter, D.; Shaligin, A.; Shevchenko, O.Yu.; Shishkin, A.A.; Siebert, H.-W.; Silva, L.; Simon, F.; Sinha, L.; Sissakian, A.N.; Slunecka, M.; Smirnov, G.I.; Sora, D.; Sosio, S.; Sozzi, F.; Srnka, A.; Stinzing, F.; Stolarski, M.; Sugonyaev, V.P.; Sulc, M.; Sulej, R.; Tarte, G.; Takabayashi, N.; Tchalishev, V.V.; Tessaro, S.; Tessarotto, F.; Teufel, A.; Thers, D.; Tkatchev, L.G.; Toeda, T.; Tokmenin, V.V.; Trippel, S.; Urban, J.; Valbuena, R.; Venugopal, G.; Virius, M.; Vlassov, N.V.; Vossen, A.; Wagner, M.; Webb, R.; Weise, E.; Weitzel, Q.; Wiedner, U.; Wiesmann, M.; Windmolders, R.; Wirth, S.; Wislicki, W.; Wollny, H.; Zanetti, A.M.; Zaremba, K.; Zavertyaev, M.; Zhao, J.; Ziegler, R.; Ziembicki, M.; Zlobin, Y.L.; Zvyagin, A.

    2007-01-01

    The COMPASS experiment makes use of the CERN SPS high-intensitymuon and hadron beams for the investigation of the nucleon spin structure and the spectroscopy of hadrons. One or more outgoing particles are detected in coincidence with the incoming muon or hadron. A large polarized target inside a superconducting solenoid is used for the measurements with the muon beam. Outgoing particles are detected by a two-stage, large angle and large momentum range spectrometer. The setup is built using several types of tracking detectors, according to the expected incident rate, required space resolution and the solid angle to be covered. Particle identification is achieved using a RICH counter and both hadron and electromagnetic calorimeters. The setup has been successfully operated from 2002 onwards using a muon beam. Data with a hadron beam were also collected in 2004. This article describes the main features and performances of the spectrometer in 2004; a short summary of the 2006 upgrade is also given.

  9. Pallidal targeting with the COMPASS system.

    Science.gov (United States)

    Alterman, R L; Kall, B; Beric, A; Sterio, D; Kelly, P J

    1997-01-01

    The authors describe their initial experience with the new pallidotomy targeting software for the COMPASS system. As COMPASS permits window and contrast settings to be changed at any time, multiple imaging modalities can be employed for targeting. This feature allowed the incorporation of fast-spin echo/inversion recovery (FSE/IR) magnetic resonance images (MRI) into the planning protocol. COMPASS has now been employed for 33 consecutive pallidotomies over the last year (July 96-June 97). A statistically significant reduction in the number of microelectrode recording trajectories required to physiologically localize sensorimotor globus pallidus interna (GPi) is noted in these cases as compared to the 41 cases performed in the previous year with a different computer planning system. The authors conclude that the COMPASS system accurately and efficiently targets the internal pallidum when FSE/IR MRI is employed. Nevertheless, pallidotomy should not be performed without neurophysiological localization. PMID:9711736

  10. Parodies in Death and the Compass

    Institute of Scientific and Technical Information of China (English)

    雒娜娜

    2016-01-01

    "Death and the Compass" parodies the traditional detective story by subverting that the detective would solve the mysteries and good would triumph over evil. It announces the death of the detective and limitation of knowledge.

  11. Light-Activated Magnetic Compass in Birds

    DEFF Research Database (Denmark)

    Solov'yov, Ilia; Greiner, Walter

    2013-01-01

    Migrating birds fly thousand miles without having a map, or a GPS unit. But they may carry their own sensitive navigational tool, which allows them "see" the Earth’s magnetic field. Here we review the important physical and chemical constraints on a possible compass sensor and discuss the suggest......Migrating birds fly thousand miles without having a map, or a GPS unit. But they may carry their own sensitive navigational tool, which allows them "see" the Earth’s magnetic field. Here we review the important physical and chemical constraints on a possible compass sensor and discuss...... the suggestion that radical pairs in a photoreceptor cryptochrome might provide a biological realization for a magnetic compass. Finally, we review the current evidence supporting a role for radical pair reactions in the magnetic compass of birds....

  12. Self-Compassion, Stress, and Coping

    Science.gov (United States)

    Allen, Ashley Batts; Leary, Mark R.

    2010-01-01

    People who are high in self-compassion treat themselves with kindness and concern when they experience negative events. The present article examines the construct of self-compassion from the standpoint of research on coping in an effort to understand the ways in which people who are high in self-compassion cope with stressful events. Self-compassionate people tend to rely heavily on positive cognitive restructuring but do not appear to differ from less self-compassionate people in the degree to which they cope through problem-solving and distraction. Existing evidence does not show clear differences in the degree to which people who are low vs. high in self-compassion seek support as a coping strategy, but more research is needed. PMID:20686629

  13. Compassion fatigue within nursing practice: a concept analysis.

    Science.gov (United States)

    Coetzee, Siedine Knobloch; Klopper, Hester C

    2010-06-01

    "Compassion fatigue" was first introduced in relation to the study of burnout among nurses, but it was never defined within this context; it has since been adopted as a synonym for secondary traumatic stress disorder, which is far removed from the original meaning of the term. The aim of the study was to define compassion fatigue within nursing practice. The method that was used in this article was concept analysis. The findings revealed several categories of compassion fatigue: risk factors, causes, process, and manifestations. The characteristics of each of these categories are specified and a connotative (theoretical) definition, model case, additional cases, empirical indicators, and a denotative (operational) definition are provided. Compassion fatigue progresses from a state of compassion discomfort to compassion stress and, finally, to compassion fatigue, which if not effaced in its early stages of compassion discomfort or compassion stress, can permanently alter the compassionate ability of the nurse. Recommendations for nursing practice, education, and research are discussed. PMID:20602697

  14. Tests of Chiral perturbation theory with COMPASS

    OpenAIRE

    Friedrich Jan M.

    2014-01-01

    The COMPASS experiment at CERN accesses pion-photon reactions via the Primakoff effect., where high-energetic pions react with the quasi-real photon field surrounding the target nuclei. When a single real photon is produced, pion Compton scattering is accessed and from the measured cross-section shape, the pion polarisability is determined. The COMPASS measurement is in contradiction to the earlier dedicated measurements, and rather in agreement with the theoretical expectation from ChPT. In ...

  15. Compassion Fatigue, Compassion Satisfaction, and Burnout: Factors Impacting a Professional's Quality of Life

    Science.gov (United States)

    Sprang, Ginny; Whitt-Woosley, Adrienne; Clark, James J.

    2007-01-01

    This study examined the relationship between three variables, compassion fatigue (CF), compassion satisfaction (CS), and burnout, and provider and setting characteristics in a sample of 1,121 mental health providers in a rural southern state. Respondents completed the Professional Quality of Life Scale as part of a larger survey of provider…

  16. Stellar formation

    CERN Document Server

    Reddish, V C

    1978-01-01

    Stellar Formation brings together knowledge about the formation of stars. In seeking to determine the conditions necessary for star formation, this book examines questions such as how, where, and why stars form, and at what rate and with what properties. This text also considers whether the formation of a star is an accident or an integral part of the physical properties of matter. This book consists of 13 chapters divided into two sections and begins with an overview of theories that explain star formation as well as the state of knowledge of star formation in comparison to stellar structure

  17. Stellar Populations

    NARCIS (Netherlands)

    Peletier, Reynier F.

    2013-01-01

    This is a summary of my lectures during the 2011 Canary Islands Winter School in Puerto de la Cruz. I give an introduction to the field of stellar populations in galaxies, and highlight some new results. Since the title of the Winter School is Secular Evolution in Galaxies I mostly concentrate on ne

  18. COMPASS measurements with hadron beams

    International Nuclear Information System (INIS)

    Muon and hadron beams from the CERN Super Proton Synchrotron are used in the COMPASS experiment for high-energy scattering reactions off fixed targets, aiming at measurements of non-perturbative aspects of quantum chromodynamics. With pion beams, the meson spectrum can be examined via diffractive dissociation, where the existence of hybrid or exotic states is a much discussed issue. The double-diffractive process of central production, which can be measured also with a proton beam, is a promising approach for the search for glueballs. At extremely small momentum transfer, electromagnetic processes are accessible via the Primakoff effect and aim at the determination of QCD low energy constants as the pion polarisability and the chiral anomaly. The muon program, focused on deep inelastic scattering, took place in the years 2002 to 2007. During this time, in autumn 2004, also a first pilot run with a pion beam was taken with the focus on diffractive and Primakoff measurements. Preliminary results and conclusions are presented. Data taking with a pion beam was resumed in 2008, where large statistics for diffractive scattering was collected. First insights, also in view of the findings of previous experiments, are presented, as well as the planning for continuation of data taking in 2009.

  19. Hadron Spectroscopy with COMPASS - Newest Results

    Science.gov (United States)

    Nerling, Frank

    2012-12-01

    The COMPASS experiment at the CERN SPS investigates the structure and spectrum of hadrons by scattering high energetic hadrons and polarised muons off various fixed targets. During the years 2002-2007, COMPASS focused on nucleon spin physics using 160 GeV/c polarised µ+ beams on polarised deuteron and proton targets, including measurements of the gluon contribution to the nucleon spin using longitudinal target polarisation as well as studies of transverse spin effects in the nucleon on a transversely polarised target. One major goal of the physics programme using hadron beams is the search for new states, in particular the search for JPC exotic states and glue-balls. COMPASS measures not only charged but also neutral final-state particles, allowing for investigation of new objects in different reactions and decay channels. In addition COMPASS can measure low-energy QCD constants like, e.g. the electromagnetic polarisability of the pion. Apart from a few days pilot run data taken in 2004 with a 190 GeV/c π- beam on a Pb target, showing a significant spin-exotic JPC = 1-+ resonance at around 1660 MeV/c2, COMPASS collected high statistics with negative and positive 190 GeV/c hadron beams on a proton (H2) and nuclear (Ni, Pb) targets in 2008 and 2009. We give a selected overview of the newest results and discuss the status of various ongoing analyses.

  20. Hadron Spectroscopy with COMPASS – Newest Results

    Directory of Open Access Journals (Sweden)

    Nerling Frank

    2012-12-01

    Full Text Available The COMPASS experiment at the CERN SPS investigates the structure and spectrum of hadrons by scattering high energetic hadrons and polarised muons off various fixed targets. During the years 2002–2007, COMPASS focused on nucleon spin physics using 160 GeV/c polarised µ+ beams on polarised deuteron and proton targets, including measurements of the gluon contribution to the nucleon spin using longitudinal target polarisation as well as studies of transverse spin effects in the nucleon on a transversely polarised target. One major goal of the physics programme using hadron beams is the search for new states, in particular the search for JPC exotic states and glue-balls. COMPASS measures not only charged but also neutral final-state particles, allowing for investigation of new objects in different reactions and decay channels. In addition COMPASS can measure low-energy QCD constants like, e.g. the electromagnetic polarisability of the pion. Apart from a few days pilot run data taken in 2004 with a 190 GeV/c π− beam on a Pb target, showing a significant spin-exotic JPC = 1−+ resonance at around 1660 MeV/c2, COMPASS collected high statistics with negative and positive 190 GeV/c hadron beams on a proton (H2 and nuclear (Ni, Pb targets in 2008 and 2009. We give a selected overview of the newest results and discuss the status of various ongoing analyses.

  1. Compassion satisfaction, compassion fatigue, and burnout in a national sample of trauma treatment therapists.

    Science.gov (United States)

    Craig, C D; Sprang, G

    2010-05-01

    For behavioral health professionals working with traumatized clients, continuous and prolonged exposure to the stress of working with the myriad of trauma-related stressors experienced by their clients can lead to various responses including burnout, compassion fatigue, and compassion satisfaction. The present study investigates the impact of using evidence-based practices on compassion fatigue, burnout, and compassion satisfaction in a random, national sample of self-identified trauma specialists (N=532). The 30-item Professional Quality of Life Scale (Stamm, 2005) and the 19-item Trauma Practices Questionnaire (Craig & Sprang, 2009) were included in a survey to licensed social workers and psychologists from professional membership rosters. Age and years of experience proved to be powerful predictors of only two of the three criterion variables, with younger professionals reporting higher levels of burnout and more experienced providers endorsing higher levels of compassion satisfaction. The utilization of evidence-based practices predicted statistically significant decreases in compassion fatigue and burnout, and increases in compassion satisfaction. The utility of these findings in understanding the process of trauma transmission between therapist and client as well as directions for future research are discussed. PMID:19590994

  2. Compassion Fatigue: Strategies for Minimizing Impact on Aesthetic Medical Providers.

    Science.gov (United States)

    Brennan, Connie

    2015-01-01

    Compassion fatigue is emotional, physical, and spiritual exhaustion from witnessing and absorbing the problems of others. Aesthetic providers are prone to becoming victims of compassion fatigue because of the stress of meeting the often overwhelming needs of patients. This article discusses what is known about compassion fatigue, what differentiates it from burnout, and how to recognize and combat it. PMID:26605823

  3. Compassion Fatigue among Social Work Students in Field Placements

    Science.gov (United States)

    Harr, Cynthia; Moore, Brenda

    2011-01-01

    This pilot study, conducted with BSW and MSW field students at a public university in Southwestern United States, explored the psychological effect of compassion fatigue and compassion satisfaction on social work students in field placements. Results from the Professional Quality of Life Scale's compassion satisfaction and fatigue subscales…

  4. Nursing on empty: compassion fatigue signs, symptoms, and system interventions.

    Science.gov (United States)

    Harris, Chelsia; Griffin, Mary T Quinn

    2015-01-01

    Few healthcare organizations acknowledge, discuss, or provide interventions for assisting with compassion fatigue. Yet, it is an important concept due to its individual, professional, and financial costs. This article defines compassion fatigue, differentiates it from burnout, and offers system interventions for supporting nurses and reducing compassion fatigue. PMID:25898441

  5. Self-Compassion and the Dynamics of Investigating Sexual Harassment

    Science.gov (United States)

    Serri, Conchita Franco

    2006-01-01

    What role does compassion play in one's work? In the author's organization, the word "compassion" has been mostly linked to their values, mission, and programs. She has generally understood the concept of compassion as a deep feeling of empathy that flows from oneself towards others during certain situations and conditions. In her mind, "having…

  6. Stellarator physics

    International Nuclear Information System (INIS)

    This document consists of the proceedings of the Seventh International Workshop on Stellarators, held in Oak Ridge, Tennessee, USA, 10-14 April, 1989. The document consists of a summary of presentations, an overview of experimental results, and papers presented at the workshop on transport, impurities and divertors, diagnostics, ECH confinement experiments, equilibrium and stability studies, RF heating, confinement, magnetic configurations, and new experiments. Refs, figs and tabs

  7. Hadron Spectroscopy with COMPASS at CERN

    CERN Document Server

    Schönning, Karin

    2012-01-01

    The aim of the COMPASS hadron programme is to study the light-quark hadron spectrum, and in particular, to search for evidence of hybrids and glueballs. COMPASS is a fixed-target experiment at the CERN SPS and features a two-stage spectrometer with high momentum resolution, large acceptance, particle identification and calorimetry. A short pilot run in 2004 resulted in the observation of a spin-exotic state with $J^{PC} = 1^{-+}$ consistent with the debated $\\pi1(1600)$. In addition, Coulomb production at low momentum transfer data provide a test of Chiral Perturbation Theory. During 2008 and 2009, a world leading data set was collected with hadron beam which is currently being analysed. The large statistics allows for a thorough decomposition of the data into partial waves. The COMPASS hadron data span over a broad range of channels and shed light on several different aspects of QCD.

  8. Hadron Spectroscopy with COMPASS at CERN

    CERN Document Server

    Schönning, Karin

    2012-01-01

    The aim of the COMPASS hadron programme is to study the light-quark hadron spectrum, and in particular, to search for evidence of hybrids and glueballs. COMPASS is a fixed-target experiment at the CERN SPS and features a two-stage spectrometer with high momentum resolution, large acceptance, particle identification and calorimetry. A short pilot run in 2004 resulted in the observation of a spin-exotic state with $J^{PC} =$ 1${−+}$ consistent with the debated /4\\pi_{1}$(1600). In addition, Coulomb production at low momentum transfer data provide a test of Chiral Perturbation Theory. During 2008 and 2009, a world leading data set was collected with hadron beam which is currently being analysed. The large statistics allows for a thorough decomposition of the data into partial waves. The COMPASS hadron data span over a broad range of channels and shed light on several different aspects of QCD.

  9. The compassion gap in UK universities

    Directory of Open Access Journals (Sweden)

    Kathryn Waddington

    2016-05-01

    Full Text Available Context: This critical reflection is set in the context of increasing marketisation in UK higher education, where students are seen as consumers, rather than learners with power. The paper explores the dark side of academic work and the compassion gap in universities, in order to make recommendations for practice development in higher education and the human services. Aims: The paper aims to show how reflexive dialogue can be used to enable the development of compassionate academic practice. Conclusions and implications for practice: Toxic environments and organisational cultures in higher education have compounded the crisis in compassionate care in the NHS. Implications for practice are: Narrative approaches and critical appreciative inquiry are useful methods with which to reveal, and rectify, failures of compassion Courageous conversations are required to challenge dysfunctional organisational systems and processes Leadership development programmes should include the application of skills of compassion in organisational settings

  10. Experience with the COMPASS Conditions Data Base

    Institute of Scientific and Technical Information of China (English)

    TakeakiToeda; MassimoLamanna; 等

    2001-01-01

    The COMPASS experiment at CERN is starting data taking in summer 2001,The COMPASS off-line framework(CORAL)will use the CERN Conditions Data Base(CDB)to handle time dependent quantities like calibration constants and data from the slow control system.We describe the use of the CDB within CORAL and the fullscale performance tests on the COMPASS Computing Farm(CCF),The CDB has been interfaced to the SCADA PVSS slow control system.To continuously transfer all the data to the CDB and make them available to the users,We describe this interface,a feasibility study performed using mock data and we predict the expected performance.

  11. Overview of the COMPASS CODAC system

    Energy Technology Data Exchange (ETDEWEB)

    Hron, M., E-mail: mhron@seznam.cz [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Janky, F. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8 (Czech Republic); Pipek, J. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Sousa, J.; Carvalho, B.B.; Fernandes, H. [Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa (Portugal); Vondracek, P. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8 (Czech Republic); Cahyna, P.; Urban, J. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Paprok, R. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8 (Czech Republic); and others

    2014-03-15

    Highlights: • Overview of the Control, Data Acquisition, and Communication system (CODAC) on the COMPASS tokamak. • Set-up of CODAC hardware, software implementation, and communication tools. • Feedback control of COMPASS plasma using the MARTe framework. • Actuators, data sources, and data acquisition systems employed on COMPASS. • Communication links and protocols used within the COMPASS CODAC. - Abstract: This paper presents an overview of the Control, Data Acquisition, and Communication system (CODAC) at the COMPASS tokamak: the hardware set-up, software implementation, and communication tools are described. The diagnostics and the data acquisition are tailored for high spatial and temporal resolution required by the COMPASS physics programme, which aims namely at studies of the plasma edge, pedestal, and Scrape-off-Layer (SOL). Studies of instabilities and turbulence are also an integral part of the programme. Therefore, the data acquisition consists of more than 1000 channels, sampled at rates from 500 kS/s up to 2 GS/s. Presently, the feedback system controls the plasma position and shape, plasma current, and density and it includes 32 analogue input channels as well as 1 digital input/output channel and 8 analogue outputs. The feedback control runs within the Multi-threaded Application Real-Time executor (MARTe) framework with two threads, a 500 μs cycle to control slow systems and a 50 μs cycle to control the fast feedback power supplies for plasma position control. In this paper, special attention is paid to the links between the systems, to the hardware and software connections, and to the communication. The hardware part is described, the software framework is addressed, and the particular implementation – the dedicated software modules, communication protocols, and links to the database are described.

  12. Overview of the COMPASS CODAC system

    International Nuclear Information System (INIS)

    Highlights: • Overview of the Control, Data Acquisition, and Communication system (CODAC) on the COMPASS tokamak. • Set-up of CODAC hardware, software implementation, and communication tools. • Feedback control of COMPASS plasma using the MARTe framework. • Actuators, data sources, and data acquisition systems employed on COMPASS. • Communication links and protocols used within the COMPASS CODAC. - Abstract: This paper presents an overview of the Control, Data Acquisition, and Communication system (CODAC) at the COMPASS tokamak: the hardware set-up, software implementation, and communication tools are described. The diagnostics and the data acquisition are tailored for high spatial and temporal resolution required by the COMPASS physics programme, which aims namely at studies of the plasma edge, pedestal, and Scrape-off-Layer (SOL). Studies of instabilities and turbulence are also an integral part of the programme. Therefore, the data acquisition consists of more than 1000 channels, sampled at rates from 500 kS/s up to 2 GS/s. Presently, the feedback system controls the plasma position and shape, plasma current, and density and it includes 32 analogue input channels as well as 1 digital input/output channel and 8 analogue outputs. The feedback control runs within the Multi-threaded Application Real-Time executor (MARTe) framework with two threads, a 500 μs cycle to control slow systems and a 50 μs cycle to control the fast feedback power supplies for plasma position control. In this paper, special attention is paid to the links between the systems, to the hardware and software connections, and to the communication. The hardware part is described, the software framework is addressed, and the particular implementation – the dedicated software modules, communication protocols, and links to the database are described

  13. Fast photon detection for COMPASS RICH-1

    CERN Document Server

    Abbon, P; Angerer, H; Apollonio, M; Birsa, R; Bordalo, P; Bradamante, Franco; Bressan, A; Busso, L; Chiosso, M; Ciliberti, P; Colantoni, M L; Costa, S; Dibiase, N; Dafni, T; Dalla Torre, S; Díaz, V; Duic, V; Delagnes, E; Deschamps, H; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Finger, J M; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Von Harrach, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K C; Kolosov, V N; Konorov, I; Kramer, Daniel; Kunne, Fabienne; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nähle, O; Neyret, D; Nerling, F; Pagano, P; Paul, S; Panebianco, S; Panzieri, D; Pesaro, G; Pizzolotto, C; Polak, J; Rebourgeard, P; Rocco, E; Robinet, F; Schiavon, Paolo; Schill, C; Schoenmeier, P; Silva, L; Slunecka, M; Steiger, L; Sozzi, F; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2007-01-01

    A fast photon detection system has been built and assembled for the upgrade of COMPASS RICH-1. The system is based on multianode photomultipliers coupled to fused silica lenses to collect the light from a larger surface and to guide it to the photocathode, preserving the position information. The emphasis is on the fast response and high rate capability of the detectors and the associated electronics. The photon detection system is now ready and it will be employed in the 2006 COMPASS data taking. We report about the system design and construction.

  14. Tests of Chiral perturbation theory with COMPASS

    Directory of Open Access Journals (Sweden)

    Friedrich Jan M.

    2014-06-01

    Full Text Available The COMPASS experiment at CERN accesses pion-photon reactions via the Primakoff effect., where high-energetic pions react with the quasi-real photon field surrounding the target nuclei. When a single real photon is produced, pion Compton scattering is accessed and from the measured cross-section shape, the pion polarisability is determined. The COMPASS measurement is in contradiction to the earlier dedicated measurements, and rather in agreement with the theoretical expectation from ChPT. In the same experimental data taking, reactions with neutral and charged pions in the final state are measured and analyzed in the context of chiral perturbation theory.

  15. Love and compassion meditation: a nondual perspective.

    Science.gov (United States)

    Josipovic, Zoran

    2016-06-01

    This paper discusses meditation from the unique perspective of the nondual approach and explores the possible relevance of this approach to applications of love and compassion meditation in clinical settings. It contrasts the nondual approach with the better known gradual or goal-oriented, dualistic view of meditation. This paper also introduces one of the central ideas of the nondual approach-that love and compassion, like other positive qualities that are ordinarily considered as goals of meditation practice, can be found to be already present within oneself as innate dimensions of one's authentic being. PMID:27152716

  16. Real-time software for the COMPASS tokamak plasma control

    International Nuclear Information System (INIS)

    The COMPASS tokamak has started its operation recently in Prague and to meet the necessary operation parameters its real-time system, for data processing and control, must be designed for both flexibility and performance, allowing the easy integration of code from several developers and to guarantee the desired time cycle. For this purpose an Advanced Telecommunications Computing Architecture based real-time system has been deployed with a solution built on a multi-core x86 processor. It makes use of two software components: the BaseLib2 and the MARTe (Multithreaded Application Real-Time executor) real-time frameworks. The BaseLib2 framework is a generic real-time library with optimized objects for the implementation of real-time algorithms. This allowed to build a library of modules that process the acquired data and execute control algorithms. MARTe executes these modules in kernel space Real-Time Application Interface allowing to attain the required cycle time and a jitter of less than 1.5 μs. MARTe configuration and data storage are accomplished through a Java hardware client that connects to the FireSignal control and data acquisition software. This article details the implementation of the real-time system for the COMPASS tokamak, in particular the organization of the control code, the design and implementation of the communications with the actuators and how MARTe integrates with the FireSignal software.

  17. Real-time software for the COMPASS tokamak plasma control

    Energy Technology Data Exchange (ETDEWEB)

    Valcarcel, D.F., E-mail: danielv@ipfn.ist.utl.p [Associacao EURATOM/IST, Instituto de Plasmas e Fusao Nuclear - Laboratorio Associado, Instituto Superior Tecnico, P-1049-001 Lisboa (Portugal); Duarte, A.S.; Neto, A.; Carvalho, I.S.; Carvalho, B.B.; Fernandes, H.; Sousa, J. [Associacao EURATOM/IST, Instituto de Plasmas e Fusao Nuclear - Laboratorio Associado, Instituto Superior Tecnico, P-1049-001 Lisboa (Portugal); Sartori, F. [Euratom-UKAEA, Culham Science Centre, Abingdon, OX14 3DB Oxon (United Kingdom); Janky, F.; Cahyna, P.; Hron, M.; Panek, R. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Prague (Czech Republic)

    2010-07-15

    The COMPASS tokamak has started its operation recently in Prague and to meet the necessary operation parameters its real-time system, for data processing and control, must be designed for both flexibility and performance, allowing the easy integration of code from several developers and to guarantee the desired time cycle. For this purpose an Advanced Telecommunications Computing Architecture based real-time system has been deployed with a solution built on a multi-core x86 processor. It makes use of two software components: the BaseLib2 and the MARTe (Multithreaded Application Real-Time executor) real-time frameworks. The BaseLib2 framework is a generic real-time library with optimized objects for the implementation of real-time algorithms. This allowed to build a library of modules that process the acquired data and execute control algorithms. MARTe executes these modules in kernel space Real-Time Application Interface allowing to attain the required cycle time and a jitter of less than 1.5 {mu}s. MARTe configuration and data storage are accomplished through a Java hardware client that connects to the FireSignal control and data acquisition software. This article details the implementation of the real-time system for the COMPASS tokamak, in particular the organization of the control code, the design and implementation of the communications with the actuators and how MARTe integrates with the FireSignal software.

  18. Compassion fatigue and the adult protective services social worker.

    Science.gov (United States)

    Bourassa, Dara Bergel

    2009-04-01

    Compassion fatigue is a relatively new term that describes the symptoms that are experienced by social workers and other helping professionals who work with clients experiencing trauma. This article defines the concept of compassion fatigue and relates compassion fatigue to Adult Protective Services (APS) social workers. It is proposed that APS social workers may be susceptible to the deleterious effects of compassion fatigue due to the nature of their work and environment. Suggestions for avoidance of compassion fatigue are also discussed, including self-care strategies and the need for continuing education regarding this phenomenon. PMID:19308828

  19. Suffering and compassion: The links among adverse life experiences, empathy, compassion, and prosocial behavior.

    Science.gov (United States)

    Lim, Daniel; DeSteno, David

    2016-03-01

    Experiencing past adversity traditionally has been linked to negative life outcomes. However, emerging evidence suggests that heterogeneity exists with respect to links between adversity and resilience, with adversity often enhancing cooperation in the face of joint suffering. Here, the authors present 2 studies designed to examine if the severity of past adversity is associated with an enduring propensity for empathy-mediated compassion, and, if so, whether the resulting compassion directly is, in turn, linked to behavior meant to relieve the suffering of others. Using both MTurk and laboratory-based paradigms, the authors find that increasing severity of past adversity predicts increased empathy, which in turn, is linked to a stable tendency to feel compassion for others in need. In addition, they demonstrate that the resulting individual differences in compassion appear to engender behavioral responses meant to assist others (i.e., charitable giving, helping a stranger). (PsycINFO Database Record PMID:26751630

  20. The influence of trait-negative affect and compassion satisfaction on compassion fatigue in Australian nurses.

    Science.gov (United States)

    Craigie, Mark; Osseiran-Moisson, Rebecca; Hemsworth, David; Aoun, Samar; Francis, Karen; Brown, Janie; Hegney, Desley; Rees, Clare

    2016-01-01

    For this study, we examined the nature of the unique relationships trait-negative affect and compassion satisfaction had with compassion fatigue and its components of secondary traumatic stress and burnout in 273 nurses from 1 metropolitan tertiary acute hospital in Western Australia. Participants completed the Professional Quality of Life Scale (Stamm, 2010), Depression Anxiety Stress Scale (Lovibond & Lovibond, 2004), and the State-Trait Anxiety Inventory (Spielberger, Gorsuch, Lushene, Vagg, & Jacobs, 1983). Bivariate correlation and hierarchical regression analyses were performed to examine and investigate 4 hypotheses. The results demonstrate a clear differential pattern of relationships with secondary traumatic stress and burnout for both trait-negative affect and compassion satisfaction. Trait-negative affect was clearly the more important factor in terms of its contribution to overall compassion fatigue and secondary traumatic stress. In contrast, compassion satisfaction's unique protective relationship only related to burnout, and not secondary traumatic stress. The results are therefore consistent with the view that compassion satisfaction may be an important internal resource that protects against burnout, but is not directly influential in protecting against secondary traumatic stress for nurses working in an acute-care hospital environment. With the projected nursing workforce shortages in Australia, it is apparent that a further understanding is warranted of how such personal variables may work as protective and risk factors. PMID:25961866

  1. On the large COMPASS polarized deuteron target

    Czech Academy of Sciences Publication Activity Database

    Ball, J.; Baum, G.; Doshita, N.; Finger Jr., M.; Finger, M.; Gautheron, F.; Goertz, S.; Hasegawa, T.; Heckmann, J.; Hess, C.; Horikawa, N.; Ishimoto, S.; Iwata, T.; Kisselev, Y.; Koivuniemi, J.H.; Kondo, K.; Le Goff, J.M.; Magnon, A.; Marchand, C.; Matsuda, T.; Meyer, W.; Reicherz, G.; Srnka, Aleš

    2006-01-01

    Roč. 56, Suppl. F (2006), F295-F305. ISSN 0011-4626 R&D Projects: GA MŠk ME 492 Institutional research plan: CEZ:AV0Z20650511 Keywords : COMPASS * polarized target * Dilution refrigerator Subject RIV: BF - Elementary Particles and High Energy Physics Impact factor: 0.568, year: 2006

  2. Walking alongside Children as They Form Compassion

    Science.gov (United States)

    Sanders, Wendy Hinrichs

    2010-01-01

    The affluence in the United States in the recent past has made it tempting to indulge children in individual achievement within a culture of abundance. Parents and teachers worry over how to teach compassion in a culture of abundance and competition for personal success, where children's time is over-scheduled and they are geographically dispersed…

  3. Hadron Spectroscopy with COMPASS: Newest Results

    CERN Document Server

    Nerling, Frank

    2012-01-01

    The COMPASS experiment at the CERN SPS investigates the structure and spectrum of hadrons by scattering high energetic hadrons and polarised muons off various fixed targets. During the years 2002-2007, COMPASS focused on nucleon spin physics using 160 GeV/c polarised $\\mu^+$ beams on polarised deuteron and proton targets, including measurements of the gluon contribution to the nucleon spin using longitudinal target polarisation as well as studies of transverse spin effects in the nucleon on a transversely polarised target. One major goal of the physics programme using hadron beams is the search for new states, in particular the search for $J^{PC}$ exotic states and glue-balls. COMPASS measures not only charged but also neutral final-state particles, allowing for investigation of new objects in different reactions and decay channels. In addition COMPASS can measure low-energy QCD constants like, e.g. the electromagnetic polarisability of the pion. Apart from a few days pilot run data taken in 2004 with a 190 G...

  4. Passion and Compassion Represent Dualities for Growth

    DEFF Research Database (Denmark)

    Brink, Tove

    2015-01-01

    Purpose – The purpose of this paper is to enhance the understanding of the impact of passion and compassion on innovation and growth and, in this way, add to the current knowledge on organising growth in the context of networking small and medium-sized enterprises (SMEs). Design/methodology/appro...

  5. Micropattern gaseous detectors in the COMPASS tracker

    Science.gov (United States)

    Ketzer, B.

    2002-11-01

    The tracking of particles in the region close to the high-intensity beam of the COMPASS experiment at CERN is based on two novel types of micropattern gaseous detectors, the Micromegas and the GEM. Chosen for their high localization accuracy and rate capability, intrinsic to this technology of highly granular gaseous devices, their large active area of up to 40×40 cm2 and small material budget offer additional advantages for tracking of particles in a high-luminosity experiment. The basic principles of these detectors as well as the design adopted for the COMPASS experiment, aiming at optimization of operation according to their positions in the spectrometer, are presented. Means to minimize the probability of gas discharges, and to reduce their impact on detector operation, as implemented for both detector types, are discussed. For the 2001 run of COMPASS, over 50% of the total number of detectors required for the full setup was installed and successfully operated. First results concerning the operational characteristics in the COMPASS muon beam are presented.

  6. Hadron-Photon Interactions in COMPASS

    OpenAIRE

    Moinester, Murray A.; Steiner, Victor; Prakhov, Serguei

    1999-01-01

    The COMPASS experiment at CERN SPS will use hadron beams (pion, kaon and proton) and muons at 50-280 GeV/c and virtual photon targets to investigate, via Primakoff effect, important hadron properties: polarizability, chiral anomaly, radiative transitions and hybrid meson production. We present simulation studies to optimize the beam, detector setup and trigger for measuring with high statistics above topics.

  7. Compassion: How Do You Teach It?

    Science.gov (United States)

    Kohler-Evans, Patty; Barnes, Candice Dowd

    2015-01-01

    Evidence suggests that there is a correlation between the violent images and stories we view through media and the effects those stories have on children and young adults, namely the suppression of compassion. With so much emphasis on academic standards, sometimes social emotional skills are grossly neglected. Students are being taught how to…

  8. Does Self-Compassion Mitigate the Association between Childhood Maltreatment and Later Emotion Regulation Difficulties? A Preliminary Investigation

    Science.gov (United States)

    Vettese, Lisa C.; Dyer, Catherine E.; Li, Wing Ling; Wekerle, Christine

    2011-01-01

    Child maltreatment-related outcomes range from no symptom expression to suicide. Increasingly, the diverse presentations have been conceptualized as core system dysregulation, including emotion dysregulation. Self-compassion has been advanced as a self-regulation strategy for countering negative self-directed emotions. This study explored whether…

  9. Commissioning and validation of COMPASS system for VMAT patient specific quality assurance

    Science.gov (United States)

    Pimthong, J.; Kakanaporn, C.; Tuntipumiamorn, L.; Laojunun, P.; Iampongpaiboon, P.

    2016-03-01

    Pre-treatment patient specific quality assurance (QA) of advanced treatment techniques such as volumetric modulated arc therapy (VMAT) is one of important QA in radiotherapy. The fast and reliable dosimetric device is required. The objective of this study is to commission and validate the performance of COMPASS system for dose verification of VMAT technique. The COMPASS system is composed of an array of ionization detectors (MatriXX) mounted to the gantry using a custom holder and software for the analysis and visualization of QA results. We validated the COMPASS software for basic and advanced clinical application. For the basic clinical study, the simple open field in various field sizes were validated in homogeneous phantom. And the advanced clinical application, the fifteen prostate and fifteen nasopharyngeal cancers VMAT plans were chosen to study. The treatment plans were measured by the MatriXX. The doses and dose-volume histograms (DVHs) reconstructed from the fluence measurements were compared to the TPS calculated plans. And also, the doses and DVHs computed using collapsed cone convolution (CCC) Algorithm were compared with Eclipse TPS calculated plans using Analytical Anisotropic Algorithm (AAA) that according to dose specified in ICRU 83 for PTV.

  10. Stellarator fusion reactors - an overview

    International Nuclear Information System (INIS)

    The stellarator system offers a distinct alternative to the mainline approaches to magnetic fusion power and has several potentially major advantages. Since the first proposal of the stellarator concept many reactor studies have been published and these studies reflect the large variety of stellarator configurations. The main representatives are the continuous-coil configurations and the modular-coil configurations. As a continuation of the LHD experiment two reactor configurations, FFHR1 and FFHR2, have been investigated, which use continuous helical windings for providing the magnetic field. The modular coil concept has been realized in the MHH-reactor study (USA 1997) and in the Helias reactor. The Helias reactor combines the principle of plasma optimisation with a modular coil system. The paper also discusses the issues associated with the blanket and the maintenance process. Stellarator configurations with continuous coils such as LHD possess a natural helical divertor, which can be used favourably for impurity control. In advanced stellarators with modular coils the same goal can be achieved by the island divertor. Plasma parameters in the various stellarator reactors are computed on the basis of presently known scaling laws showing that confinement is sufficiently good to provide ignition and self-sustained burn. (author)

  11. 77 FR 41804 - Solicitation for a Cooperative Agreement: Development of Materials Specific to Compassion Fatigue...

    Science.gov (United States)

    2012-07-16

    ... Specific to Compassion Fatigue and Vicarious Trauma in Corrections AGENCY: National Institute of... to define, identify, and address compassion fatigue and vicarious trauma within the corrections..., acknowledge, and address vicarious trauma and compassion fatigue within the corrections profession....

  12. Compassion fatigue and burnout: what managers should know.

    Science.gov (United States)

    Slatten, Lise Anne; David Carson, Kerry; Carson, Paula Phillips

    2011-01-01

    Most health care employees experience and are bolstered by compassion satisfaction as they deal with patients in need. However, the more empathetic a health care provider is, the more likely he or she will experience compassion fatigue. Compassion fatigue is a negative syndrome that occurs when dealing with the traumatic experiences of patients, and examples of symptoms include intrusive thoughts, sleeping problems, and depression. Compassion fatigue is different from burnout. Compassion fatigue is a rapidly occurring disorder for primary health care workers who work with suffering patients, whereas burnout, a larger construct, is a slowly progressing disorder for employees who typically are working in burdensome organizational environments. Managers can mitigate problems associated with compassion fatigue with a number of interventions including patient reassignments, formal mentoring programs, employee training, and a compassionate organizational culture. With burnout, health care managers will want to focus primarily on chronic organizational problems. PMID:22042140

  13. Measurement of the Polarised Drell-Yan process at COMPASS

    OpenAIRE

    Quaresma Márcia

    2014-01-01

    The COMPASS experiment at CERN has been playing an important role in the studies of the spin content of the nucleon. The Semi-Inclusive Deep Inelastic Scattering (SIDIS) process gives access to the transverse momentum dependent parton distribution functions (TMDs) by the measurement of azimuthal asymmetries that have been studied in COMPASS and published in recent years. TMDs are also accessible by the transversely polarised Drell-Yan (DY) process which will be measured in COMPASS. This will ...

  14. Compassion: a scoping review of the healthcare literature

    OpenAIRE

    Sinclair, Shane; Norris, Jill M.; McConnell, Shelagh J.; Chochinov, Harvey Max; Hack, Thomas F; Hagen, Neil A.; McClement, Susan; Bouchal, Shelley Raffin

    2016-01-01

    Background Recent concerns about suboptimal patient care and a lack of compassion have prompted policymakers to question the preparedness of clinicians for the challenging environment in which they practice. Compassionate care is expected by patients and is a professional obligation of clinicians; however, little is known about the state of research on clinical compassion. The purpose of this scoping review was to map the literature on compassion in clinical healthcare. Methods Searches of ei...

  15. Sivers effect at HERMES, COMPASS & CLAS12

    Energy Technology Data Exchange (ETDEWEB)

    Arnold, S.; V. Efremov, A.; Goeke, Klaus; Schlegel, Marc; Schweitzer, Peter

    2009-01-01

    Single spin asymmetries in semi-inclusive deep-inelastic scattering off transversely polarized targets give information on, among other fascinating effects, a pseudo time-reversal odd parton distribution function, the ?Sivers function?. In this proceeding we review the extractions of this function from HERMES and COMPASS data. In particular, the HERMES pion and kaon data suggest significant contributions from sea-quarks at x ? 0.15 to the Sivers effect. We present a new fit that includes all relevant sea quark distributions and gives a statistically satisfactory overall description of the data, but does not describe well the K+ data from HERMES. We argue that measurements of the pion- and kaon Sivers effect at CLAS12, and COMPASS, will clarify the situation.

  16. Hadron muoproduction at the COMPASS experiment

    CERN Document Server

    Rajotte, J F

    The COMPASS Collaboration has two main fields of interest: to improve our knowledge of the nucleon spin structure and to study hadrons through spectroscopy. These goals require a multipurpose universal spectrometer such as the COmmon Muon and Proton Apparatus for Structure and Spectroscopy, COMPASS. In its first years of data taking (2002-2007), the nucleon spin structure was studied with a polarized muon beam scattering off a polarized target. These studies resumed in 2010 and will continue until at least 2011. The years 2008 and 2009 were dedicated to hadron spectroscopy using hadron beams. In the case of the nucleon structure studies, it is crucial to detect with high precision the incoming beam muon (160 GeV), the scattered muon and the produced hadrons. The large amount of high quality data accumulated provides access to the unpolarized and polarized parton distributions of the nucleon and the hadronization process. Subtle differences (asymmetries) between polarized cross sections have been predicted for...

  17. Measurement of the Pion Polarizability at COMPASS

    CERN Document Server

    Huber, Stefan

    2014-01-01

    The value of the pion polarizability is predicted with high precision by Chiral Perturbation Theory. However, the existing experimental values are at tension with this prediction as well as among themselves. The COMPASS experiment at the CERN SPS accesses pion-photon reactions via the Primakoff effect, where high-energetic pions react with the quasi-real photon field surrounding the target nuclei. Flagship channel is the Primakoff reaction in which a single real photon is produced, giving access to pion Compton scattering. Using this process the pion polarizability is extracted from the measured cross-section shape. End of 2009 COMPASS performed a measurement of the pion polarizability using a nickel target. The large amount of data collected in combination with the possibility to study systematic effects using the analogous reaction with a muon beam, the most precise experimental value to date was determined.

  18. Measurement of the Pion Polarisability at COMPASS

    CERN Document Server

    Friedrich, Jan

    2007-01-01

    The COMPASS experiment at CERN has investigated Primakoff reactions of 190 GeV/c pions with the Coulomb field of various target nuclei, predominatly lead, in a pilot run in the year 2004. The photoproduction process $\\pi^{−}Z\\rightarrow\\pi^{-}Z\\gamma$ is related to Compton scattering on the pion, and gives access to the electric and magnetic polarisabilities, $\\alpha_{\\pi}$ and $\\beta_{\\pi}$. The unique feature of the COMPASS setup to measure the equivalent reaction with identified muons during the same beam time allows for a reliable treatment of systematic apparative effects. In a first analysis, the value $\\alpha_{\\pi} =$ 2.5 $\\pm$ 1.7$_{stat}$ $\\pm$ 0.6$_{sys}$ ·10$^{−4}$ fm$^{3}$ was obtained, assuming $\\alpha_{\\pi} = −\\beta_{\\pi}$ on theoretical reasons.

  19. Measurement of the pion polarizability with COMPASS

    Energy Technology Data Exchange (ETDEWEB)

    Huber, Stefan [Physikdepartment E18, Technische Universitaet Muenchen (Germany); Collaboration: Stefan Huber for the COMPASS collaboration

    2014-07-01

    Chiral Perturbation Theory predicts a precise value for the charged-pion polarisability. Experiments performed within the last decades are in tension with this value and also do not agree with each other. At the COMPASS experiment at CERN the pion polarisability is accessible through the Primakoff effect, where the quasi-real photons surrounding the nickel nuclei are used to measure pion-photon scattering. Studying the energy distribution of the outgoing photons, the polarisability value can be extracted. During the 2009 data taking COMPASS performed a first measurement based on about 60 000 exclusive events. In addition to the measurement with a pion beam a control measurement with a muon beam has been performed in order to control the systematics. The details of the measurement as well as the results are discussed.

  20. Monitoring tools of COMPASS experiment at CERN

    Science.gov (United States)

    Bodlak, M.; Frolov, V.; Huber, S.; Jary, V.; Konorov, I.; Levit, D.; Novy, J.; Salac, R.; Tomsa, J.; Virius, M.

    2015-12-01

    This paper briefly introduces the data acquisition system of the COMPASS experiment and is mainly focused on the part that is responsible for the monitoring of the nodes in the whole newly developed data acquisition system of this experiment. The COMPASS is a high energy particle experiment with a fixed target located at the SPS of the CERN laboratory in Geneva, Switzerland. The hardware of the data acquisition system has been upgraded to use FPGA cards that are responsible for data multiplexing and event building. The software counterpart of the system includes several processes deployed in heterogenous network environment. There are two processes, namely Message Logger and Message Browser, taking care of monitoring. These tools handle messages generated by nodes in the system. While Message Logger collects and saves messages to the database, the Message Browser serves as a graphical interface over the database containing these messages. For better performance, certain database optimizations have been used. Lastly, results of performance tests are presented.

  1. Recent results from COMPASS and HERMES

    Energy Technology Data Exchange (ETDEWEB)

    Schnell, Gunar [DESY, Zeuthen (Germany)

    2010-07-01

    Deep-inelastic lepton scattering has for a long time been a valuable tool to examine the structure of nucleons. Both the COMPASS and the HERMES collaborations have followed up on this long tradition by scattering charged leptons from polarized and unpolarized targets. The recent results from both experiments are reviewed and, when applicable, compared; with emphasis given to polarized quark distributions and 3D nucleon tomography.

  2. Prospects for gluon polarization measurement at COMPASS

    CERN Document Server

    Marchand, C

    2004-01-01

    The COMPASS experiment at CERN consists of a two stage magnetic spectrometer. In its initial phase, it is equipped with all necessary detectors to measure the gluon polarization through the photon gluon fusion mechanism, either by direct observation of charmed mesons D$^{0}$ or from high $p_{T}$ pairs. After an overview of first data taken in 2002, expectations for extraction of gluon polarization in the near future will be presented.

  3. Tests of Chiral Perturbation Theory with COMPASS

    CERN Document Server

    Friedrich, Jan

    2010-01-01

    The COMPASS experiment at the CERN SPS studies with high precision pion-photon induced reactions via the Primakoff effect on nuclear targets. This offers the test of chiral perturbation theory (ChPT) in various channels: Pion Compton scattering allows to clarify the long-standing question of the pion polarisabilities, single neutral pion production is related to the chiral anomaly, and for the two-pion production cross sections exist as yet untested ChPT predictions.

  4. Measurement of the Pion Polarizability at COMPASS

    OpenAIRE

    Huber, Stefan

    2014-01-01

    The value of the pion polarizability is predicted with high precision by Chiral Perturbation Theory. However, the existing experimental values are at tension with this prediction as well as among themselves. The COMPASS experiment at the CERN SPS accesses pion-photon reactions via the Primakoff effect, where high-energetic pions react with the quasi-real photon field surrounding the target nuclei. Flagship channel is the Primakoff reaction in which a single real photon is produced, giving acc...

  5. Tests of Chiral Perturbation Theory with COMPASS

    International Nuclear Information System (INIS)

    The COMPASS experiment at CERN studies with high precision pion-photon induced reactions on nuclear targets via the Primakoff effect. This offers the possibility to test chiral perturbation theory (ChPT) in various channels: Pion Compton scattering allows to clarify the longstanding question of the pion polarisabilities, single neutral pion production is related to the chiral anomaly, and for the two-pion production cross sections exist as yet untested ChPT predictions.

  6. Self-Compassion and Well-being among Older Adults

    Science.gov (United States)

    Allen, Ashley Batts; Goldwasser, Eleanor R.; Leary, Mark R.

    2012-01-01

    Two studies assessed the role of self-compassion as a moderator of the relationship between physical health and subjective well-being in the elderly. In Study 1, 132 participants, ranging in age from 67–90 years, completed a questionnaire that assessed their perceptions of their physical health, self-compassion, and subjective well-being. Participants who were in good physical health had high subjective well-being regardless of their level of self-compassion. However, for participants with poorer physical health, self-compassion was associated with greater subjective well-being. In Study 2, 71 participants between the ages of 63 and 97 completed a questionnaire assessing self-compassion, well-being, and their willingness to use assistance for walking, hearing, and memory. Self-compassionate participants reported being less bothered by the use of assistance than those low in self-compassion, although the relationship between self-compassion and willingness to use assistive devices was mixed. These findings suggest that self-compassion is associated with well-being in later life and that interventions to promote self-compassion may improve quality of life among older adults. PMID:23525647

  7. The COMPASS RICH-1 detector upgrade

    CERN Document Server

    Abbon, P; Angerer, H; Apollonio, M; Birsa, R; Bordalo, P; Bradamante, F; Bressan, A; Busso, L; Chiosso, M; Ciliberti, P; Colantoni, M L; Costa, S; Dalla Torre, S; Dafni, T; Delagnes, E; Deschamps, H; Díaz, V; Dibiase, N; Duic, V; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Finger, M Jr; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; Von Harrach, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K C; Kolosov, V N; Konorov, I; Kramer, Daniel; Kunne, F; Lehmann, A; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nähle, O; Nerling, F; Neyret, D; Pagano, P; Panebianco, S; Panzieri, D; Paul, S; Pesaro, G; Polak, J; Rebourgeard, P; Robinet, F; Rocco, E; Schiavon, P; Schill, C; Schröder, W; Silva, L; Slunecka, M; Sozzi, F; Steiger, L; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2008-01-01

    The COMPASS experiment at CERN provides hadron identification in a wide momentum range employing a large size gaseous Ring Imaging CHerenkov detector (RICH). The presence of large uncorrelated background in the COMPASS environment was limiting the efficiency of COMPASS RICH-1 in the very forward regime. A major upgrade of RICH-1 required a new technique for Cherenkov photon detection at count rates of several 10$^{6}$/s per channel in the central detector part, and a read-out system allowing for trigger rates of up to 100 kHz. To cope with these requirements, the photon detectors of the central region have been replaced with a fast photon detection system described here, while, in the peripheral regions, the existing multi-wire proportional chambers with CsI photo-cathodes have been equipped with a new read-out system based on APV preamplifiers and flash ADC chips. The new system consists of multi-anode photomultiplier tubes (MAPMTs) coupled to individual fused silica lens telescopes, and fast read-out electr...

  8. Micropattern gaseous detectors in the COMPASS tracker

    CERN Document Server

    Ketzer, B

    2002-01-01

    The tracking of particles in the region close to the high-intensity beam of the COMPASS experiment at CERN is based on two novel types of micropattern gaseous detectors, the Micromegas and the GEM. Chosen for their high localization accuracy and rate capability, intrinsic to this technology of highly granular gaseous devices, their large active area of up to 40 * 40 cm/sup 2/ and small material budget offer additional advantages for tracking of particles in a high- luminosity experiment. The basic principles of these detectors as well as the design adopted for the COMPASS experiment, aiming at optimization of operation according to their positions in the spectrometer, are presented. Means to minimize the probability of gas discharges, and to reduce their impact on detector operation, as implemented for both detector types, are discussed. For the 2001 run of COMPASS, over 50% of the total number of detectors required for the full setup was installed and successfully operated. First results concerning the opera...

  9. The use of supercomputers in stellar dynamics; Proceedings of the Workshop, Institute for Advanced Study, Princeton, NJ, June 2-4, 1986

    Science.gov (United States)

    Hut, Piet; McMillan, Stephen L. W.

    Various papers on the use of supercomputers in stellar dynamics are presented. Individual topics addressed include: dynamical evolution of globular clusters, disk galaxy dynamics on the computer, mathematical models of star cluster dynamics, models of hot stellar systems, supercomputers and large cosmological N-body simulations, the architecture of a homogeneous vector supercomputer, the BBN multiprocessors Butterfly and Monarch, the Connection Machine, a digital Orrery, and the outer solar system for 200 million years. Also considered are: application of smooth particle hydrodynamics theory to lunar origin, multiple mesh techniques for modeling interacting galaxies, numerical experiments on galactic halo formation, numerical integration using explicit Taylor series, multiple-mesh-particle scheme for N-body simulation, direct N-body simulation on supercomputers, vectorization of small-N integrators, N-body integrations using supercomputers, a gridless Fourier method, techniques and tricks for N-body computation.

  10. CARBON ABUNDANCE IN SMALL MAGELLANIC CLOUD PLANETARY NEBULAE THROUGH ADVANCED CAMERA FOR SURVEYS PRISM SPECTROSCOPY: CONSTRAINING STELLAR EVOLUTION AT LOW METALLICITY

    International Nuclear Information System (INIS)

    We perform near ultraviolet ACS prism spectroscopy of 11 Small Magellanic Cloud (SMC) planetary nebulae (PNe) with the main aim of deriving the abundance of carbon. The analysis of the ACS spectra provides reliable atomic carbon abundances for all but a couple of our targets; ionic C2+ abundances are calculated for all target PNe. With the present paper we more than double the number of SMC PNe with known carbon abundances, providing a good database to study the elemental evolution in low- and intermediate-mass stars at low metallicity. We study carbon abundances of Magellanic Cloud PNe in the framework of stellar evolution models and the elemental yields. Constraining SMC and LMC stellar evolutionary models is now possible with the present data, through the comparison of the final yields calculated and the CNO abundances observed. We found that SMC PNe are almost exclusively carbon rich, and that for the most part they have not undergone the hot bottom burning phase, contrary to about half of the studied LMC PNe. The yields from stellar evolutionary models with LMC and SMC metallicities broadly agree with the observations. In particular, evolutionary yields for M to sun well encompass the abundances of round and elliptical PNe in the SMC. We found that the carbon emission lines are major coolants for SMC PNe, more so than in their LMC counterparts, indicating that metallicity has an effect on the physics of PNe, as predicted by Stanghellini et al.

  11. Stellar Metamorphosis:

    Science.gov (United States)

    2002-01-01

    [TOP LEFT AND RIGHT] The Hubble Space Telescope's Wide Field and Planetary Camera 2 has captured images of the birth of two planetary nebulae as they emerge from wrappings of gas and dust, like butterflies breaking out of their cocoons. These images highlight a fleeting phase in the stellar burnout process, occurring just before dying stars are transformed into planetary nebulae. The left-hand image is the Cotton Candy nebula, IRAS 17150-3224; the right-hand image, the Silkworm nebula, IRAS 17441-2411. Called proto-planetary nebulae, these dying stars have been caught in a transition phase between a red giant and a planetary nebula. This phase is only about 1,000 years long, very short in comparison to the 1 billion-year lifetime of a star. These images provide the earliest snapshots of the transition process. Studying images of proto-planetary nebulae is important to understanding the process of star death. A star begins to die when it has exhausted its thermonuclear fuel - hydrogen and helium. The star then becomes bright and cool (red giant phase) and swells to several tens of times its normal size. It begins puffing thin shells of gas off into space. These shells become the star's cocoon. In the Hubble images, the shells are the concentric rings seen around each nebula. But the images also reveal the nebulae breaking out from those shells. The butterfly-like wings of gas and dust are a common shape of planetary nebulae. Such butterfly shapes are created by the 'interacting winds' process, in which a more recent 'fast wind' - material propelled by radiation from the hot central star - punches a hole in the cocoon, allowing the nebula to emerge. (This 'interacting wind' theory was first proposed by Dr. Sun Kwok to explain the origin of planetary nebulae, and has been subsequently proven successful in explaining their shapes.) The nebulae are being illuminated by light from the invisible central star, which is then reflected toward us. We are viewing the nebulae

  12. Intranasal administration of oxytocin increases compassion toward women.

    Science.gov (United States)

    Palgi, Sharon; Klein, Ehud; Shamay-Tsoory, Simone G

    2015-03-01

    It has been suggested that the degree of compassion-the feeling of warmth, understanding and kindness that motivates the desire to help others, is modulated by observers' views regarding the target's vulnerability and suffering. This study tested the hypothesis that as compassion developed to protect vulnerable kinships, hormones such as oxytocin, which have been suggested as playing a key role in 'tend-and-befriend' behaviors among women, will enhance compassion toward women but not toward men. Thirty subjects participated in a double-blind, placebo-controlled, within-subject study. Following administration of oxytocin/placebo, participants listened to recordings of different female/male protagonists describing distressful emotional conflicts and were then asked to provide compassionate advice to the protagonist. The participants' responses were coded according to various components of compassion by two clinical psychologists who were blind to the treatment. The results showed that in women and men participants oxytocin enhanced compassion toward women, but did not affect compassion toward men. These findings indicate that the oxytocinergic system differentially mediates compassion toward women and toward men, emphasizing an evolutionary perspective that views compassion as a caregiving behavior designed to help vulnerable individuals. PMID:24711542

  13. Perception of Suffering and Compassion Experience: Brain Gender Disparities

    Science.gov (United States)

    Mercadillo, Roberto E.; Diaz, Jose Luis; Pasaye, Erick H.; Barrios, Fernando A.

    2011-01-01

    Compassion is considered a moral emotion related to the perception of suffering in others, and resulting in a motivation to alleviate the afflicted party. We compared brain correlates of compassion-evoking images in women and men. BOLD functional images of 24 healthy volunteers (twelve women and twelve men; age=27 [plus or minus] 2.5 y.o.) were…

  14. Effectiveness of CompassLearning's Odyssey Reading for Middle School

    Science.gov (United States)

    Empirical Education Inc., 2010

    2010-01-01

    Odyssey Reading, published by CompassLearning, is a comprehensive reading/language arts program using adaptive software for core instruction. This is the first study of CompassLearning's Odyssey Reading (CLO) in PUSD and was based on data from the school years 2006-2008. For this study, Odyssey Reading was implemented in reading classes in grades…

  15. Advanced probe diagnostics for measurement of electromagnetic properties of turbulent structures at the plasma edge of the TJ-II stellarator

    International Nuclear Information System (INIS)

    Improved understanding of properties of the current filamentary structures in the edge plasma region is believed to allow better insight into development and possible control of the Edge localised modes (ELMs) and consequently, mitigation of their impact on the plasma performance and the first wall structures. We have focused on measurements of electric and magnetic properties of the filaments and electromagnetic features of the edge turbulence on TJ-II. We used a probe consisting of two 3D coil sets, two Hall sensors and 4 Langmuir tips. We present the first results of measurements with this probe on TJ-II stellarator.

  16. Advanced probe diagnostics for measurement of electromagnetic properties of turbulent structures at the plasma edge of the TJ-II stellarator

    Czech Academy of Sciences Publication Activity Database

    Kovařík, Karel; Ďuran, Ivan; Hron, Martin; Hidalgo, C.; Carralero, D.; Pedrosa, M. A.

    Vol. 516. Bristol : Institute of Physics Publishing, 2014, 012011-012011. ISSN 1742-6588. - (IOPscience. 516). [International Workshop and Summer School on Plasma Physics 2010, IWSSPP 2010/4./. Kiten (BG), 05.07.2010-10.07.2010] R&D Projects: GA MPO 2A-1TP1/101; GA ČR GD202/08/H057; GA MŠk 7G09042; GA MŠk 7G10072 Institutional support: RVO:61389021 Keywords : Edge plasma * stellarator * probes Subject RIV: BL - Plasma and Gas Discharge Physics http://iopscience.iop.org/1742-6596/516/1/012011/pdf/1742-6596_516_1_012011.pdf

  17. Who is at risk for compassion fatigue? An investigation of genetic counselor demographics, anxiety, compassion satisfaction, and burnout.

    Science.gov (United States)

    Lee, Whiwon; Veach, Patricia McCarthy; MacFarlane, Ian M; LeRoy, Bonnie S

    2015-04-01

    Compassion fatigue is a state of detachment and isolation experienced when healthcare providers repeatedly engage with patients in distress. Compassion fatigue can hinder empathy and cause extreme tension. Prior research suggests 73.8 % of genetic counselors are at moderate to high risk for compassion fatigue and approximately 1 in 4 have considered leaving the field as a result Injeyan et al. (Journal of Genetic Counseling, 20, 526-540, 2011). Empirical data to establish a reliable profile of genetic counselors at risk for compassion fatigue are limited. Thus the purpose of this study was to establish a profile by assessing relationships between state and trait anxiety, burnout, compassion satisfaction, selected demographics and compassion fatigue risk in practicing genetic counselors. Practicing genetic counselors (n = 402) completed an anonymous, online survey containing demographic questions, the State-Trait Anxiety Inventory, and the Professional Quality of Life scale. Multiple regression analysis yielded four significant predictors which increase compassion fatigue risk (accounting for 48 % of the variance): higher levels of trait anxiety, burnout, and compassion satisfaction, and ethnicity other than Caucasian. Additional findings, study limitations, practice implications, and research recommendations are provided. PMID:24781713

  18. Modules for Experiments in Stellar Astrophysics (MESA)

    CERN Document Server

    Paxton, Bill; Dotter, Aaron; Herwig, Falk; Lesaffre, Pierre; Timmes, Frank

    2010-01-01

    Stellar physics and evolution calculations enable a broad range of research in astrophysics. Modules for Experiments in Stellar Astrophysics (MESA) is a suite of open source libraries for a wide range of applications in computational stellar astrophysics. A newly designed 1-D stellar evolution module, MESA star, combines many of the numerical and physics modules for simulations of a wide range of stellar evolution scenarios ranging from very-low mass to massive stars, including advanced evolutionary phases. MESA star solves the fully coupled structure and composition equations simultaneously. It uses adaptive mesh refinement and sophisticated timestep controls, and supports shared memory parallelism based on OpenMP. Independently usable modules provide equation of state, opacity, nuclear reaction rates, and atmosphere boundary conditions. Each module is constructed as a separate Fortran 95 library with its own public interface. Examples include comparisons to other codes and show evolutionary tracks of very l...

  19. Available: lead plate from COMPASS experiment

    CERN Multimedia

    The COMPASS collaboration

    2014-01-01

    The COMPASS collaboration would like to offer the possibility to take over a large and thick lead plate, since it is not required anymore in the spectrometer.   It has the following dimensions: thickness 100 mm, width 4.4 m and height 2.0 m, with a square hole in the middle with dimensions of 40 cm x 40 cm. The measured weight including the metal frame it is housed in is 10,180 kg. The CERN stores reference is 44.13.30.100.9. Please contact Erwin Bielert (erwin.bielert@cern.ch or 160539) for further information and details.

  20. Atomic Beam Probe Diagnostic for COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Háček, Pavel; Weinzettl, Vladimír; Stöckel, Jan; Anda, G.; Veres, G.; Zoletnik, S.; Berta, M.

    Vol. 2. Prague: MATFYZPRESS, 2010 - (Šafránková, J.; Pavlů, J.), s. 7-11. (WDS'10). ISBN 978-80-7378-140-8. [Annual Conference of Doctoral Students - WDS 2010 /19th./. Prague (CZ), 01.06.2010-04.06.2010] R&D Projects: GA ČR GA202/09/1467 Institutional research plan: CEZ:AV0Z20430508 Keywords : plasma diagnostics * tokamak * COMPASS * beam diagnostics Subject RIV: BL - Plasma and Gas Discharge Physics http://server.ipp.cas.cz/~vwei/work/wds2010_201_f2.pdf

  1. Fast Photon Detection for COMPASS RICH1

    CERN Document Server

    Abbon, P; Angerer, H; Apollonio, M; Birsa, R; Bordalo, P; Bradamante, F; Bressan, A; Busso, L; Chiosso, M; Ciliberti, P; Colantoni, M L; Costa, S; Dibiase, N; Dafni, T; Dalla Torre, S; Diaz, V; Duic, v; Delagnes, E; Deschamps, H; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Finger, M Jr; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; Von Harrach, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K; Kolosov, V N; Konorov, I; Kramer, D; Kunne, F; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nähle, O; Neyret, D; Nerling, F; Pagano, P; Paul, S; Panebianco, S; Panzieri, D; Pesaro, G; Pizzolotto, C; Polak, J; Rebourgeard, P; Rocco, E; Robinet, F; Schiavon, P; Schill, C; Schoenmeier, P; Silva, L; Slunecka, M; Steiger, L; Sozzi, F; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2006-01-01

    The new photon detection system for COMPASS RICH-1 has been designed to cope with the demanding requests of operation at high beam intensity and at high trigger rates. The detection technique in the central region of RICH-1 has been changed with a system based on multianode photomultipliers coupled to individual fused silica lens telescopes and to a fast, almost dead time free readout system based on the MAD-4 amplifier-discriminator and the F1 TDC-chip. The new photon detection system design and construction are described, as well as its first response in the experiment.

  2. Diffractive $\\rho^{0}$ production at COMPASS

    CERN Document Server

    D'Hose, N

    2006-01-01

    Diffractive leptoproduction of $\\rho^{0}$ mesons, $\\mu + N\\rightarrow\\mu + N + \\rho$ is measured at COMPASS at $ =$ 10 GeV over a wide range of Q$^{2}$, 0.01 $< Q^{2} <$ 10 GeV$^{2}$. Angular distributions to determine spin density matrix elements and longitudinal double-spin asymmetry $A^{\\rho}_{1}$ are investigated. Preliminary results are presented. They are consistent with a substantial increase of $R =\\sigma_{L} /\\sigma_{T}$ with $Q^{2}$, a weak violation of SCHC. The asymmetry is consistent with zero in the whole kinematical range.

  3. First Spectroscopic Measurements on the COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Naydenkova, Diana; Stöckel, Jan; Weinzettl, Vladimír; Šesták, David; Havlíček, Josef

    Vol. 2. Prague : MATFYZPRESS, Prague, 2009 - (Šafránková, J.; Pavlů, J.), s. 158-162 ISBN 978-80-7378-102-6. [Annual conference of doctoral students - WDS 2009 /18./. Prague (CZ), 02.06.2009-05.06.2009] R&D Projects: GA ČR GD202/08/H057 Institutional research plan: CEZ:AV0Z20430508 Keywords : COMPASS * tokamak * spectroscopic measurements Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/contents/pdf09/WDS09_227_f2_Naydenkova.pdf

  4. Daytime TV's day of compassion for AIDS.

    Science.gov (United States)

    McFarlane, R

    1995-07-01

    Daytime television's national Day of Compassion programming, a Hollywood Supports-sponsored event where entire shows and storylines were devoted to HIV/AIDS topics, is highlighted. Programming successes are examined, including cable TV's contribution to the event and the general public's approval. Richard Jennings of Hollywood Supports, the entertainment industry group that works to counter workplace fears and discrimination based on HIV status and sexual orientation, states that he and his group are aiming at prime time next year. This mission is particularly important now given the tenor of hateful distortion about people with AIDS from the religious right and the current mood of Congress towards AIDS-related funding. PMID:11362727

  5. Hadron physics at the COMPASS experiment

    Directory of Open Access Journals (Sweden)

    Krinner Fabian

    2015-01-01

    The Compass experiment at the CERN Super Proton Synchrotron has acquired large data sets, which allow to study light-quark meson and baryon spectra in unprecedented detail. The presented overview of the first results from this data set focuses in particular on the light meson sector and presents a detailed analysis of three-pion final states. A new JPC = 1++ state, the a1(1420, is observed with a mass and width in the ranges m = 1412 − 1422MeV/c2 and Γ = 130 − 150MeV/c2.

  6. Diagnostic Lithium Beam System for COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Háček, P.; Weinzettl, Vladimír; Stöckel, Jan; Anda, G.; Veres, G.; Zoletnik, S.; Berta, M.

    Prague : MATFYZPRESS, 2011 - (Šafránková, J.; Pavlů, J.), s. 215-220 ISBN 978-80-7378-185-9. - (WDS. 2). [WDS 2011 - Annual Conference of Doctoral Students /20./. Prague (CZ), 31.05.2011-03.06.2011] R&D Projects: GA ČR GA202/09/1467 Institutional research plan: CEZ:AV0Z20430508 Keywords : plasma diagnostics * tokamak, COMPASS * beam diagnostics Subject RIV: BL - Plasma and Gas Discharge Physics http:// server .ipp.cas.cz/~vwei/work/wds2010_201_f2.pdf

  7. COMPASS mirror wall of RICH 1

    CERN Multimedia

    Patrice Loïez

    2001-01-01

    The COMPASS experiment uses ring imaging Cherenkov (RICH) counters to identify particles produced in high-energy muon collisions, to better understand the spin structure of the nucleon. Charged particles moving faster than the speed of light in the medium through which they are travelling emit a cone of Cherenkov radiation in the direction of their motion. The light in this cone is reflected from these mirrors onto a photo detector so that the size of the cone can be measured, which gives the energy of the particle.

  8. Overview of the COMPASS CODAC system

    Czech Academy of Sciences Publication Activity Database

    Hron, Martin; Janky, Filip; Pipek, Jan; Sousa, J.; Carvalho, B.B.; Fernandes, H.; Vondráček, Petr; Cahyna, Pavel; Urban, Jakub; Papřok, Richard; Mikulín, Ondřej; Aftanas, Milan; Pánek, Radomír; Havlíček, Josef; Fortunato, J.; Batista, A.J.N.; Santos, B.A.; Duarte, A.; Pereira, T.; Valcárcel, D.

    2014-01-01

    Roč. 89, č. 3 (2014), s. 177-185. ISSN 0920-3796 R&D Projects: GA MŠk 7G10072; GA MŠk(CZ) LM2011021; GA ČR GAP205/11/2470; GA ČR GP13-38121P Institutional support: RVO:61389021 Keywords : tokamak * COMPASS * CODAC * Real-time control * MARTe * Experiment control Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 1.152, year: 2014 http://www.sciencedirect.com/science/article/pii/S0920379613006613#

  9. COMPASS Final Report: Lunar Relay Satellite (LRS)

    Science.gov (United States)

    Oleson, Steven R.; McGuire, Melissa L.

    2012-01-01

    The Lunar Relay Satellite (LRS) COllaborative Modeling and Parametric Assessment of Space Systems (COMPASS) session was tasked to design a satellite to orbit in an elliptical lunar polar orbit to provide relay communications between lunar South Pole assets and the Earth. The design included a complete master equipment list, power requirement list, configuration design, and brief risk assessment and cost analysis. The LRS is a half-TDRSS sized box spacecraft, which provides communications and navigation relay between lunar outposts (via Lunar Communications Terminals (LCT)) or Sortie parties (with user radios) and large ground antennas on Earth. The LRS consists of a spacecraft containing all the communications and avionics equipment designed by NASA Jet Propulsion Laboratory s (JPL) Team X to perform the relay between lunar-based assets and the Earth. The satellite design is a standard box truss spacecraft design with a thermal control system, 1.7 m solar arrays for 1 kWe power, a 1 m diameter Ka/S band dish which provides relay communications with the LCT, and a Q-band dish for communications to/from the Earth based assets. While JPL's Team X and Goddard Space Flight Center s (GSFC) I M Design Center (IMDC) have completed two other LRS designs, this NASA Glenn Research Center (GRC) COMPASS LRS design sits between them in terms of physical size and capabilities.

  10. The COMPASS control and engineering monitoring system

    International Nuclear Information System (INIS)

    The high degree of flexibility of the COMPASS experiment demands a control system readily adaptable to the various modes and operating conditions of the machine. The COMPASS Machine Control System therefore relies on programmable devices with the bulk of the control sequencing resident in the system software. The central control facility provides the main operator interface to the system using touch-sensitive colour monitors to set up the configuration and shot data base. A central computer transmits the processed information to five subsystem control points each of which uses a Programmable Controller to communicate with central control and enable local subsystem operation using a local control panel. Separate from the MCS, though interacting with it, are dedicated systems for fact sequence timing, personnel safety and fast engineering data monitoring. The latter system will collect and process transient signals too fast for the MCS to handle. The data will be archived along with the engineering set-up parameters and physics data and will be available for review at the central control desk

  11. Precision Studies of Light Mesons at COMPASS

    CERN Document Server

    Ketzer, Bernhard

    2014-01-01

    The COMPASS experiment at CERN's SPS investigates the structure and excitations of strongly interacting systems. Using reactions of 190 GeV/c pions with protons and nuclear targets, mediated by the strong and electromagnetic interaction, an unprecedented statistical precision has been reached allowing new insight into the properties of light mesons. For the first time the diffractively produced 3pi final state has been analyzed simultaneously in bins of invariant mass and four-momentum transfer using a large set of 88 waves up to a total angular momentum of 6. In addition to a precise determination of the properties of known resonances and including a model-indepedent analysis of the pi pi S-wave isobar, a new narrow axial-vector state coupling strongly to f0(980)pi has been found in previously unchartered territory. By selecting reactions with very small four-momentum transfer COMPASS is able to study processes involving the exchange of quasi-real photons. These provide clean access to low-energy quantities ...

  12. Measurement with hadron beams at COMPASS

    CERN Document Server

    Ferrero, Andrea

    2005-01-01

    The physics program of the COMPASS experiment at CERN focuses on the investigation of the hadron structure and spectroscopy, using both leptonic and hadronic probes. The COMPASS experiment has collected so far mostly data with polarized muon beams of 160 GeV, but also a pilot data taking with negative hadron beams of 190 GeV has been successfully completed at the end of the 2004 run. The main physics objectives of this pilot run are the study of soft pion-nuclei interactions. The predictions of the Chiral Perturbation Theory for the electric and magnetic polarizabilities of the pion will be verified through the study of the Primakoff scattering of 190 GeV pions on thin lead targets. A sample corresponding to an integrated beam flux of more than 10$^{11}$ pions has been collected for this purpose, and an equivalent sample with the muon beam of 190 GeV has been collected in the same experimental conditions to correct possible systematic effects. In parallel to the polarizability measurements, first data have al...

  13. COMPASS magnetic field coils and structure systems

    International Nuclear Information System (INIS)

    COMPASS is a new experimental toroidal assembly of compact design and with a wide range of physics objectives. It is required to operate either as a Tokamak or as a Reversed Field Pinch with interchangeable circular and dee-section vacuum vessels. The Toroidal field is produced by 16 rectangular coils of 4 turns with tapered conductors on the inside which nest together to form a vault to resist the centering forces. The coils are designed to produce a maximum field on axis of 2.1T which requires a current of 91 kA per turn. Two central solenoids and five pairs of coils symmetrically positioned above and below the machine equator provide the poloidal field. Both coil systems are supported form a mechanical support structure which surrounds the machine. This is primarily designed to resist out-of-plane forces on the TF coils but also acts as the base support for the PF coils and vacuum vessels. An illustration of the COMPASS Load Assembly is given and shows the D-shaped vacuum vessel, the major components and the various field windings

  14. Compass magnetic field coils and structure systems

    International Nuclear Information System (INIS)

    COMPASS is a new experimental toroidal assembly of compact design and with a wide range of physics objectives. It is required to operate either as a Tokamak or as a Reversed Field Pinch with interchangeable circular and dee-section vacuum vessels. The Toroidal field is produced by 16 rectangular coils of 4 turns with tapered conductors on the inside which nest together to form a vault to resist the centering forces. The coils are designed to produce a maximum field on axis of 2.1 T which requires a current of 91 kA per turn. Two central solenoids and five pairs of coils symmetrically positioned above and below the machine equator provide the poloidal field. These consist of magnetising windings which can induce a plasma current up to 400 kA and shaping, feedback and equilibrium windings, combinations of which may be selected by link-board arrangements to produce Tokamak discharges of circular, dee, inverse dee, ellipse and kidney bean cross-sections. Both coil systems are supported from a mechanical support structure which surrounds the machine. This is primarily designed to resist out-of-plane forces on the TF coils but also acts as the base support for the PF coils and vacuum vessels. An illustration of the COMPASS Load Assembly is given. (author)

  15. What is compassion and how can we measure it? A review of definitions and measures

    OpenAIRE

    Strauss, C; Lever Taylor, B.; J. Gu; Kuyken, W; Baer, R; Jones, F.W.; K. Cavanagh

    2016-01-01

    The importance of compassion is widely recognized and it is receiving increasing research attention. Yet, there is lack of consensus on definition and a paucity of psychometrically robust measures of this construct. Without an agreed definition and adequate measures, we cannot study compassion, measure compassion or evaluate whether interventions designed to enhance compassion are effective. In response, this paper proposes a definition of compassion and offers a systematic review of self- an...

  16. Definition of compassion-evoking images in a Mexican sample.

    Science.gov (United States)

    Mercadillo, Roberto E; Barrios, Fernando A; Díaz, José Luis

    2007-10-01

    To assemble a calibrated set of compassion-eliciting visual stimuli, 60 clinically healthy Mexican volunteers (36 women, 24 men; M age = 27.5 yr., SD = 2.4) assessed 84 pictures selected from the International Affective Picture System catalogue using the dimensions of Valence, Arousal, and Dominance included in the Self-assessment Manikin scale and an additional dimension of Compassion. Pictures showing suffering in social contexts and expressions of sadness elicited similar responses of compassion. The highest compassion response was reported for pictures showing illness and pain. Men and women differed in the intensity but not the quality of the compassionate responses. Compassion included attributes of negative emotions such as displeasure. The quality of the emotional response was not different from that previously reported for samples in the U.S.A., Spain, and Brazil. A set of 28 pictures was selected as high-compassion-evoking images and 28 as null-compassion controls suitable for studies designed to ascertain the neural substrates of this moral emotion. PMID:18065091

  17. Stellarator status, 1989

    International Nuclear Information System (INIS)

    The present status of stellarator experiments and recent progress in stellarator research (both experimental and theoretical) are reported by groups in the United States, the USSR, Japan, Australia, and the European Community (the Federal Republic of Germany and Spain). Experiments under construction and studies of large, next-generation stellarators are also described. 73 refs., 11 figs., 4 tabs

  18. Simulating Convection in Stellar Envelopes

    Science.gov (United States)

    Tanner, Joel

    Understanding convection in stellar envelopes, and providing a mathematical description of it, would represent a substantial advance in stellar astrophysics. As one of the largest sources of uncertainty in stellar models, existing treatments of convection fail to account for many of the dynamical effects of convection, such as turbulent pressure and asymmetry in the velocity field. To better understand stellar convection, we must be able to study and examine it in detail, and one of the best tools for doing so is numerical simulation. Near the stellar surface, both convective and radiative process play a critical role in determining the structure and gas dynamics. By following these processes from first principles, convection can be simulated self-consistently and accurately, even in regions of inefficient energy transport where existing descriptions of convection fail. Our simulation code includes two radiative transfer solvers that are based on different assumptions and approximations. By comparing simulations that differ only in their respective radiative transfer methods, we are able to isolate the effect that radiative efficiency has on the structure of the superadiabatic layer. We find the simulations to be in good general agreement, but they show distinct differences in the thermal structure in the superadiabatic layer and atmosphere. Using the code to construct a grid of three-dimensional radiation hydrodynamic simulations, we investigate the link between convection and various chemical compositions. The stellar parameters correspond to main-sequence stars at several surface gravities, and span a range in effective temperatures (4500 adiabatic structure of sub-photospheric convection. Since the MLT treatment of convection defines the thermal structure of the atmosphere and SAL arbitrarily, one strategy for calibrating the mixing length parameter is to tune it so that it matches the thermodynamics of the simulations. In particular, we consider adjusting the

  19. Compassion fatigue: A Study of critical care nurses in Turkey

    OpenAIRE

    Dikmen, Yurdanur; Aydın, Yasemin; Tabakoğlu, Pınar

    2016-01-01

    This study was conducted to determine the level of compassion fatigue which experienced by nurses who work in intensive care units and factors that affecting it.In a cross sectional design, critical nurses were surveyed by using questionnaire and  compassion fatigue (CF) subscale of the Professional Quality of Life Scale (ProQOL R-IV) to measure levels of compassion fatigueat a large National Education and ResearchHospital located in northwestof Turkey. A total of 69 critical care nurses part...

  20. Prospects for future measurements of GPDs using COMPASS at CERN

    CERN Document Server

    Burtin, Etienne

    2008-01-01

    The COMPASS collaboration has expressed the interest for pursuing an experiment dedicated to the measurement of the Generalized Parton Distributions (GPD). The GPDs can be accessed through the reactions of Deeply Virtual Compton Scattering and Hard Exclusive Meson Production. The experiment will use the existing COMPASS spectrometer with a new target, a new recoil detector and an extended calorimetry. Simulations for dierent models have been performed and the beam charge asymmetry accessible at COMPASS has a great sensitivity to the GPD models. A prototype of recoil detector was tested and shows a timing resolution slightly above the required precision.

  1. The Compass Project: Charting a New Course in Physics Education

    CERN Document Server

    Roth, Nathaniel; Lee, Gloria; Corbo, Joel

    2012-01-01

    This article tells the story of the founding of the Compass Project at UC Berkeley and describes its impacts. The Compass Project is a self-formed group of graduate and undergraduate students in the physical sciences. Its goals are to improve undergraduate physics education, provide our members with opportunities for professional development, and increase retention of students, especially those from populations typically underrepresented in the physical sciences. Compass fosters a diverse, collaborative student community by providing a wide range of services, including a summer program, fall and spring semester courses, mentoring, a research lecture series, and other academic and social support.

  2. Towards 21st Century Stellar Models: Star Clusters, Supercomputing, and Asteroseismology

    DEFF Research Database (Denmark)

    Campbell, S. W.; Constantino, T. N.; D'Orazi, V.;

    2016-01-01

    Stellar models provide a vital basis for many aspects of astronomy and astrophysics. Recent advances in observational astronomy -- through asteroseismology, precision photometry, high-resolution spectroscopy, and large-scale surveys -- are placing stellar models under greater quantitative scrutin...

  3. Sensitive chemical compass assisted by quantum criticality

    Science.gov (United States)

    Cai, C. Y.; Ai, Qing; Quan, H. T.; Sun, C. P.

    2012-02-01

    A radical-pair-based chemical reaction might be used by birds for navigation via the geomagnetic direction. The inherent physical mechanism is that the quantum coherent transition from a singlet state to triplet states of the radical pair could respond to a weak magnetic field and be sensitive to the direction of such a field; this then results in different photopigments to be sensed by the avian eyes. Here, we propose a quantum bionic setup, inspired by the avian compass, as an ultrasensitive probe of a weak magnetic field based on the quantum phase transition of the environments of the two electrons in the radical pair. We prove that the yield of the chemical products via recombination from the singlet state is determined by the Loschmidt echo of the environments with interacting nuclear spins. Thus quantum criticality of environments could enhance the sensitivity of detection of weak magnetic fields.

  4. Pion and Kaon Polarizabilities at CERN COMPASS

    CERN Document Server

    Moinester, M A

    2003-01-01

    The electric alpha and magnetic beta pion Compton polarizabilities characterize the pion's deformation in the electromagnetic field of the gamma during gamma-pi Compton scattering. The pion polarizabilities are key observables, and provide stringent tests of our understanding of chiral symmetry, its spontaneous breakdown, the role of explicit symmetry breaking in QCD. The chi_PT effective Lagrangian, using data from radiative pion beta decay, predicts the pion electric and magnetic polarizabilities alpha = -beta = 2.7 +- 0.4, in standard polarizability units. The polarizabilities deduced by Antipov et al. in their low statistics Primakoff experiment (~ 7000 events) were about three times larger than this prediction. For pion polarizability, gamma-pi scattering will be measured in CERN COMPASS via radiative pion Primakoff scattering (pion Bremsstrahlung) in the nuclear Coulomb field: pi + Z --> pi' + gamma + Z; equivalent to gamma + pi --> gamma + pi Compton scattering for laboratory gamma's of order 1 GeV inc...

  5. Measurement of the pion polarizabilities at COMPASS

    CERN Document Server

    Guskov, A V

    2006-01-01

    The electromagnetic structure of pions is probed in $\\pi\\gamma$ Compton scattering in inverse kinematics (Primakoff effect) and described by the electric ($\\alpha_{\\pi}$) and magnetic ($\\beta_{\\pi}$) polarizabilities, that depend on the rigidity of pion’s internal structure as a composite particle. Values for pion polarizabilities can be extracted from the comparison of the theoretically predicted (under approximation of unstructured pion) cross section of Primakoff scattering and the measured cross section. The high beam intensity, good spectrometer resolution, the high rate capability, the high acceptance and possibility to use pion and muon beams, that are unique to the COMPASS experiment provide the tools to measure precisely the pion polarizabilities in the $\\pi^{-} + (A,Z)\\rightarrow\\pi^{-} + (A,Z) + \\gamma$ Primakoff reaction. This cross section is related to the cross section of Compton scattering on pion. A precise tracking system, electromagnetic and hadron calorimeters provide good conditions for...

  6. Phenomenology of COMPASS data: multiplicities and Phenomenology - part II

    Directory of Open Access Journals (Sweden)

    Anselmino M.

    2015-01-01

    Full Text Available We present some of the main features of the multidimensional COMPASS multiplicities, via our analysis using the simple Gaussian model. We briefly discuss these results in connection with azimuthal asymmetries.

  7. Self-Compassion: A Mentorship Framework for Counselor Educator Mothers

    Science.gov (United States)

    Solomon, Coralis; Barden, Sejal Mehta

    2016-01-01

    Counselor educators experience high levels of stress. Mothers in academia face an additional set of emotional stressors. The authors offer a self-compassion framework for mentors to increase emotional resilience of mothers in counselor education.

  8. Phenomenology of COMPASS data: Multiplicities and Phenomenology - Part II

    OpenAIRE

    Anselmino M.; Boglione M.; Gonzalez H. J.O.; Melis S.; Prokudin A.

    2015-01-01

    We present some of the main features of the multidimensional COMPASS multiplicities, via our analysis using the simple Gaussian model. We briefly discuss these results in connection with azimuthal asymmetries.

  9. Phenomenology of COMPASS data: Multiplicities and phenomenology - part II

    International Nuclear Information System (INIS)

    In this study, we present some of the main features of the multidimensional COMPASS multiplicities, via our analysis using the simple Gaussian model. We briefly discuss these results in connection with azimuthal asymmetries

  10. Characterizing stellar and exoplanetary environments

    CERN Document Server

    Khodachenko, Maxim

    2015-01-01

    In this book an international group of specialists discusses studies of exoplanets subjected to extreme stellar radiation and plasma conditions. It is shown that such studies will help us to understand how terrestrial planets and their atmospheres, including the early Venus, Earth and Mars, evolved during the host star’s active early phase. The book presents an analysis of findings from Hubble Space Telescope observations of transiting exoplanets, as well as applications of advanced numerical models for characterizing the upper atmosphere structure and stellar environments of exoplanets. The authors also address detections of atoms and molecules in the atmosphere of “hot Jupiters” by NASA’s Spitzer telescope. The observational and theoretical investigations and discoveries presented are both timely and important in the context of the next generation of space telescopes. 
 The book is divided into four main parts, grouping chapters on exoplanet host star radiation and plasma environments, exoplanet u...

  11. Magnetic properties of nanoscale compass-Heisenberg planar clusters

    OpenAIRE

    Trousselet, F.; Oles, A. M.; Horsch, P.

    2012-01-01

    We study a model of spins 1/2 on a square lattice, generalizing the quantum compass model via the addition of perturbing Heisenberg interactions between nearest neighbors, and investigate its phase diagram and magnetic excitations. This model has motivations both from the field of strongly correlated systems with orbital degeneracy and from that of solid-state based devices proposed for quantum computing. We find that the high degeneracy of ground states of the compass model is fragile and ch...

  12. Compassion: the missing link in quality of care.

    Science.gov (United States)

    van der Cingel, Margreet

    2014-09-01

    This article discusses the impact of selected findings from a PhD-study that focuses on compassion as a guiding principle for contemporary nursing education and practice. The study, of which the literature review and empirical findings have already been published, looked at compassion as perceived within the relationship of nurses and older persons with a chronic disease. The patient group was chosen because daily life for them is characterized by long-term dependency on care. The literature review resulted in a theoretical framework of compassion that also explores other closely related concepts such as suffering and empathy. The empirical part of the study, in which 61 in-depth interviews and 6 group interviews with patients and nurses took place, showed that compassion is a mirroring process in response to grief. Compassion consists of seven dimensions such as attentiveness and presence, in which saliency, so as to anticipate patients' needs, is of major importance. Compassion is perceived by participants as an indispensable aspect of care, which helps to reveal relevant information in order to establish appropriate outcomes of care. This article focuses on the aspects of the PhD-study in which an analysis of compassion in the context of both modern as well as the history of nursing took place. Currently evidence based practice is regarded as the standard for good quality care. Nevertheless there is an on-going debate about what constitutes good quality care. Within this debate two opposing views are apparent. One view defines good care as care supported by the best scientific evidence. The other view states that good care takes place within the nurse-patient relationship in which the nurse performs professional care based on intuitive knowing. It is suggested that compassion is the (missing) link between these views. PMID:24856582

  13. Compassion Fatigue and Burnout Amongst Clinicians: A Medical Exploratory Study

    OpenAIRE

    Jaikrit Bhutani; Sukriti Bhutani; Yatan Pal Singh Balhara; Sanjay Kalra

    2012-01-01

    Background: Compassion fatigue is a broad term comprising of two components - burnout and secondary traumatic stress. The current study is aimed at identifying ′burnout′ and ′compassion fatigue′ among clinicians involved in care of individuals suffering from medical illness. Materials and Methods: A total of 60 clinicians were included in the study. A semi-structured questionnaire was administered to gather information related to personal, professional, anthropometric, and metabolic profile o...

  14. CO2 footprint and climate change. Sustainability compass

    International Nuclear Information System (INIS)

    Three times a year, the sustainability compass provides information about the public opinion with regard to sustainability. It offers needed insights for developing, implementing and assessing the sustainable policy alternatives. The results of this fourth edition of the Sustainability compass shows that half of the Dutch population holds the opinion that climate change is caused by greenhouse gas emissions. The emission should be reduced. One out of ten is quite worried about the situation.

  15. Non-verbal communication of compassion: measuring psychophysiologic effects

    OpenAIRE

    Kemper Kathi J; Shaltout Hossam A

    2011-01-01

    Abstract Background Calm, compassionate clinicians comfort others. To evaluate the direct psychophysiologic benefits of non-verbal communication of compassion (NVCC), it is important to minimize the effect of subjects' expectation. This preliminary study was designed to a) test the feasibility of two strategies for maintaining subject blinding to non-verbal communication of compassion (NVCC), and b) determine whether blinded subjects would experience psychophysiologic effects from NVCC. Metho...

  16. Pigeons combine compass and landmark guidance in familiar route navigation

    OpenAIRE

    Biro, Dora; Freeman, Robin; Meade, Jessica; Roberts, Stephen; Guilford, Tim

    2007-01-01

    How do birds orient over familiar terrain? In the best studied avian species, the homing pigeon (Columba livia), two apparently independent primary mechanisms are currently debated: either memorized visual landmarks provide homeward guidance directly, or birds rely on a compass to home from familiar locations. Using miniature Global Positioning System tracking technology and clock-shift procedures, we set sun-compass and landmark information in conflict, showing that experienced birds can acc...

  17. Procrastination and Stress: Exploring the Role of Self-compassion

    OpenAIRE

    Sirois, F.M.

    2014-01-01

    Although previous research has demonstrated that procrastinators experience high levels of stress, less is known about why procrastination is linked to stress. This study is the first to investigate self-compassion as a mediator of the relationship between trait procrastination and stress. Across four samples (145 undergraduates, 339 undergraduates, 190 undergraduates, and 94 community adults) trait procrastination was associated with lower levels of self-compassion and higher levels of stres...

  18. Conceptual dimensions of compassion fatigue and vicarious trauma

    OpenAIRE

    Dafos Rodrigo, Wayra Ana Maria

    2005-01-01

    Compassion Fatigue and Vicarious Trauma are diagnostic labels sometimes applied to therapists who become traumatized following their work with victims of trauma. Four distinct conceptual frameworks are offered to better understand Compassion Fatigue and Vicarious Trauma: (1) The analysis of the Wounded-Healer metaphor and its connection to the topic of the use of self in therapy, (2) Contextual family therapy (Boszormenyi- Nagy) and the theory of systems, (3) Theravada and Zen Buddhism, with ...

  19. Compassion Fatigue and Burnout Amongst Clinicians: A Medical Exploratory Study

    Directory of Open Access Journals (Sweden)

    Jaikrit Bhutani

    2012-01-01

    Full Text Available Background: Compassion fatigue is a broad term comprising of two components - burnout and secondary traumatic stress. The current study is aimed at identifying ′burnout′ and ′compassion fatigue′ among clinicians involved in care of individuals suffering from medical illness. Materials and Methods: A total of 60 clinicians were included in the study. A semi-structured questionnaire was administered to gather information related to personal, professional, anthropometric, and metabolic profile of the study participants. Professional Quality of Life Scale (ProQoL Version V was used to assess burnout, compassion satisfaction and secondary traumatic stress. Analysis was carried out using the SPSS version 19.0. Results: The mean age of clinicians was 46.68±11.06 (range 26-67 years. Burnout score was significantly higher in those involved in diabetology practice. Similarly, compassion satisfaction score was greater among those with greater years of practice as well as among those in private practice. Clinicians who reported a poor working condition, as opposed to good, had more burnout and less compassion satisfaction. Conclusion: The current study suggests that it is important to find out ways of decreasing burnout and compassion fatigue among clinicians.

  20. The Stagnation of Contemporary Stellar Astronomy

    CERN Document Server

    Škoda, Petr

    2011-01-01

    The stellar astronomy has always been considered the fundamental source of knowledge about the basic building blocks of the universe - the stars. It has proved correctness of many physical theories - like e.g. the idea of nuclear fusion in stellar cores, the exchange of mass in interacting binaries or models of stellar evolution towards white dwarfs or neutron stars. Despite its well acknowledged importance it seems to be loosing its interestingness for students, for telescope allocation committees at large observatories, as well as for granting agencies. In the domain of big telescopes it has been gradually overtaken by the extra-galactic research and cosmology, surviving however at smaller observatories and among most advanced amateur astronomers. We try to analyse the main obstacles lowering the efficiency of research in contemporary stellar astronomy. We will shortly tackle several problems induced by paradigmatic changes in handling the extraordinary amount of data provided by current instruments as well...

  1. EDICAM fast video diagnostic installation on the COMPASS tokamak

    International Nuclear Information System (INIS)

    A new camera system 'event detection intelligent camera' (EDICAM) is being developed by the Hungarian Association and has been installed on the COMPASS tokamak in the Institute of Plasma Physics AS CR in Prague, during February 2009. The standalone system contains a data acquisition PC and a prototype sensor module of EDICAM. Appropriate optical system have been designed and adjusted for the local requirements, and a mechanical holder keeps the camera out of the magnetic field. The fast camera contains a monochrome CMOS sensor with advanced control features and spectral sensitivity in the visible range. A special web based control interface has been implemented using Java spring framework to provide the control features in a graphical user environment. Java native interface (JNI) is used to reach the driver functions and to collect the data stored by direct memory access (DMA). Using a built in real-time streaming server one can see the live video from the camera through any web browser in the intranet. The live video is distributed in a Motion Jpeg format using real-time streaming protocol (RTSP) and a Java applet have been written to show the movie on the client side. The control system contains basic image processing features and the 3D wireframe of the tokamak can be projected to the selected frames. A MatLab interface is also presented with advanced post processing and analysis features to make the raw data available for high level computing programs. In this contribution all the concepts of EDICAM control center and the functions of the distinct software modules are described.

  2. Stellar structure and evolution

    International Nuclear Information System (INIS)

    This book introduces the theory of the internal structure of stars and their evolution in time. It presents the basic physics of stellar interiors, methods for solving the underlying equations, and the most important results necessary for understanding the wide variety of stellar types and phenomena. The evolution of stars is discussed from their birth through normal evolution to possibly spectacular final stages. Chapters on stellar oscillations and rotation are included

  3. Stellar structure and evolution

    Energy Technology Data Exchange (ETDEWEB)

    Kippernhahn, R. (MPI fur Physik und Astrophysik, Garching (DE)); Weigert, A. (Sternwarte, Hamberg (DE))

    1990-01-01

    This book introduces the theory of the internal structure of stars and their evolution in time. It presents the basic physics of stellar interiors, methods for solving the underlying equations, and the most important results necessary for understanding the wide variety of stellar types and phenomena. The evolution of stars is discussed from their birth through normal evolution to possibly spectacular final stages. Chapters on stellar oscillations and rotation are included.

  4. Group cohesion and organizational commitment: protective factors for nurse residents' job satisfaction, compassion fatigue, compassion satisfaction, and burnout.

    Science.gov (United States)

    Li, Angela; Early, Sean F; Mahrer, Nicole E; Klaristenfeld, Jessica L; Gold, Jeffrey I

    2014-01-01

    Stress can have detrimental effects on nurse residents' levels of job satisfaction, compassion, fatigue, and burnout. This can lead to high turnover rates and poor quality of care among novice nurses. Therefore, it is critical to identify protective factors to prevent the onset of negative nurse outcomes (compassion fatigue, burnout, and job dissatisfaction) and to promote positive nurse outcomes (job satisfaction, compassion satisfaction). This study aimed to determine whether factors such as group cohesion and organizational commitment would be protective and moderate the association between stress exposure and posttraumatic stress symptoms and other negative nurse outcomes, thus facilitating positive outcomes. Findings showed that group cohesion was effective in moderating the negative effects of current stress exposure and posttraumatic stress symptoms on negative nurse outcomes, specifically on increased compassion fatigue and burnout, and reduced compassion satisfaction. In addition, organizational commitment was determined to promote positive nurse outcomes such as job satisfaction and compassion satisfaction. The study findings are promising, as retention of quality nurses is a significant problem for hospitals. Nurse managers and hospital administrators should be aware of the benefits of group cohesion and organizational commitment and strive to make the promotion of these factors a priority. PMID:24503320

  5. Hadron muoproduction at the COMPASS experiment

    Energy Technology Data Exchange (ETDEWEB)

    Rajotte, Jean-Francois

    2010-09-30

    The COMPASS Collaboration has two main fields of interest: to improve our knowledge of the nucleon spin structure and to study hadrons through spectroscopy. These goals require a multipurpose universal spectrometer such as the COmmon Muon and Proton Apparatus for Structure and Spectroscopy, COMPASS. In its first years of data taking (2002-2007), the nucleon spin structure was studied with a polarized muon beam scattering off a polarized target. These studies resumed in 2010 and will continue until at least 2011. The years 2008 and 2009 were dedicated to hadron spectroscopy using hadron beams. In the case of the nucleon structure studies, it is crucial to detect with high precision the incoming beam muon (160 GeV), the scattered muon and the produced hadrons. The large amount of high quality data accumulated provides access to the unpolarized and polarized parton distributions of the nucleon and the hadronization process. Subtle differences (asymmetries) between polarized cross sections have been predicted for hadron production from polarized muon-nucleon interaction for COMPASS. It is based on these differences that the polarized parton distributions can be measured. In this context, it is important to first compare predictions with the gross features of the measured unpolarized semi-inclusive differential cross sections or the closely related differential multiplicities. In order to determine cross sections, the data has to be corrected for the acceptance of the spectrometer. In this thesis, a multidimensional acceptance correction method, based on Monte Carlo simulation, is developed and applied to the data measured in 2004. The method is first used to determine the inclusive muon-nucleon cross section which is compared with a global fit to world data. This serves as a test of the acceptance correction method and to verify if the results from previous experiments can be reproduced. Then, unpolarized differential multiplicities as a function of transverse momentum

  6. Hadron muoproduction at the COMPASS experiment

    International Nuclear Information System (INIS)

    The COMPASS Collaboration has two main fields of interest: to improve our knowledge of the nucleon spin structure and to study hadrons through spectroscopy. These goals require a multipurpose universal spectrometer such as the COmmon Muon and Proton Apparatus for Structure and Spectroscopy, COMPASS. In its first years of data taking (2002-2007), the nucleon spin structure was studied with a polarized muon beam scattering off a polarized target. These studies resumed in 2010 and will continue until at least 2011. The years 2008 and 2009 were dedicated to hadron spectroscopy using hadron beams. In the case of the nucleon structure studies, it is crucial to detect with high precision the incoming beam muon (160 GeV), the scattered muon and the produced hadrons. The large amount of high quality data accumulated provides access to the unpolarized and polarized parton distributions of the nucleon and the hadronization process. Subtle differences (asymmetries) between polarized cross sections have been predicted for hadron production from polarized muon-nucleon interaction for COMPASS. It is based on these differences that the polarized parton distributions can be measured. In this context, it is important to first compare predictions with the gross features of the measured unpolarized semi-inclusive differential cross sections or the closely related differential multiplicities. In order to determine cross sections, the data has to be corrected for the acceptance of the spectrometer. In this thesis, a multidimensional acceptance correction method, based on Monte Carlo simulation, is developed and applied to the data measured in 2004. The method is first used to determine the inclusive muon-nucleon cross section which is compared with a global fit to world data. This serves as a test of the acceptance correction method and to verify if the results from previous experiments can be reproduced. Then, unpolarized differential multiplicities as a function of transverse momentum

  7. BONNSAI: a Bayesian tool for comparing stars with stellar evolution models

    CERN Document Server

    Schneider, Fabian R N; de Koter, Alex; Brott, Ines; Izzard, Robert G; Lau, Herbert H B

    2014-01-01

    Powerful telescopes equipped with multi-fibre or integral field spectrographs combined with detailed models of stellar atmospheres and automated fitting techniques allow for the analysis of large number of stars. These datasets contain a wealth of information that require new analysis techniques to bridge the gap between observations and stellar evolution models. To that end, we develop BONNSAI (BONN Stellar Astrophysics Interface), a Bayesian statistical method, that is capable of comparing all available observables simultaneously to stellar models while taking observed uncertainties and prior knowledge such as initial mass functions and distributions of stellar rotational velocities into account. BONNSAI can be used to (1) determine probability distributions of fundamental stellar parameters such as initial masses and stellar ages from complex datasets, (2) predict stellar parameters that were not yet observationally determined and (3) test stellar models to further advance our understanding of stellar evol...

  8. Light-dependent magnetic compass in Iberian green frog tadpoles

    Science.gov (United States)

    Diego-Rasilla, Francisco Javier; Luengo, Rosa Milagros; Phillips, John B.

    2010-12-01

    Here, we provide evidence for a wavelength-dependent effect of light on magnetic compass orientation in Pelophylax perezi (order Anura), similar to that observed in Rana catesbeiana (order Anura) and Notophthalmus viridescens (order Urodela), and confirm for the first time in an anuran amphibian that a 90° shift in the direction of magnetic compass orientation under long-wavelength light (≥500 nm) is due to a direct effect of light on the underlying magnetoreception mechanism. Although magnetic compass orientation in other animals (e.g., birds and some insects) has been shown to be influenced by the wavelength and/or intensity of light, these two amphibian orders are the only taxa for which there is direct evidence that the magnetic compass is light-dependent. The remarkable similarities in the light-dependent magnetic compasses of anurans and urodeles, which have evolved as separate clades for at least 250 million years, suggest that the light-dependent magnetoreception mechanism is likely to have evolved in the common ancestor of the Lissamphibia (Early Permian, ~294 million years) and, possibly, much earlier. Also, we discuss a number of similarities between the functional properties of the light-dependent magnetic compass in amphibians and blue light-dependent responses to magnetic stimuli in Drosophila melanogaster, which suggest that the wavelength-dependent 90° shift in amphibians may be due to light activation of different redox forms of a cryptochrome photopigment. Finally, we relate these findings to earlier studies showing that the pineal organ of newts is the site of the light-dependent magnetic compass and recent neurophysiological evidence showing magnetic field sensitivity in the frog frontal organ (an outgrowth of the pineal).

  9. “We feel deep compassion for patients...” | NIH MedlinePlus the Magazine

    Science.gov (United States)

    ... page please turn Javascript on. Feature: Medical Mysteries “We feel deep compassion for patients...” Past Issues / Spring ... real hope and maybe even relief. As doctors, we feel deep compassion for patients who have been ...

  10. Compassion Fatigue: An Application of the Concept to Informal Caregivers of Family Members with Dementia

    Directory of Open Access Journals (Sweden)

    Jennifer R. Day

    2011-01-01

    Full Text Available Introduction. Compassion fatigue is a concept used with increasing frequency in the nursing literature. The objective of this paper is to identify common themes across the literature and to apply these themes, and an existing model of compassion fatigue, to informal caregivers for family members with dementia. Findings. Caregivers for family members with dementia may be at risk for developing compassion fatigue. The model of compassion fatigue provides an informative framework for understanding compassion fatigue in the informal caregiver population. Limitations of the model when applied to this population were identified as traumatic memories and the emotional relationship between parent and child, suggesting areas for future research. Conclusions. Research is needed to better understand the impact of compassion fatigue on informal caregivers through qualitative interviews, to identify informal caregivers at risk for compassion fatigue, and to provide an empirical basis for developing nursing interventions for caregivers experiencing compassion fatigue.

  11. Las Campanas Stellar Library

    Science.gov (United States)

    Chilingarian, Igor; Zolotukhin, Ivan; Beletsky, Yuri; Worthey, Guy

    2015-08-01

    Stellar libraries are fundamental tools required to understand stellar populations in star clusters and galaxies as well as properties of individual stars. Comprehensive libraries exist in the optical domain, but the near-infrared (NIR) domain stays a couple of decades behind. Here we present the Las Campanas Stellar Library project aiming at obtaining high signal-to-noise intermediate-resolution (R=8000) NIR spectra (0.83library the largest homogeneous collection of stellar spectra covering the entire NIR domain. We also re-calibrated in flux and wavelength the two existing optical stellar libraries, INDO-US and UVES-POP and followed up about 400 non-variable stars in the NIR in order to get complete optical-NIR coverage. Worth mentioning that our current sample includes about 80 AGB stars and a few dozens of bulge/LMC/SMC stars.

  12. Less constrained omnigeneous stellarators

    CERN Document Server

    Parra, Felix I; Helander, Per; Landreman, Matt

    2014-01-01

    A stellarator is omnigeneous if all particles have vanishing average radial drifts. For this reason, omnigeneous stellarators have levels of neoclassical particle and energy transport comparable to those in tokamaks, and are good candidates for nuclear fusion reactors. In the pioneering and influential article [Cary~J~R and Shasharina~S~G 1997 {\\it Phys. Plasmas} {\\bf 4} 3323], the conditions that the magnetic field of a stellarator must satisfy to be omnigeneous are derived. However, reference [Cary~J~R and Shasharina~S~G 1997 {\\it Phys. Plasmas} {\\bf 4} 3323] only considered omnigeneous stellarators in which all the minima of the magnetic field strength on a flux surface must have the same value. The same is assumed for the maxima. We show that omnigenenous magnetic fields can have local minima and maxima with different values. Thus, the parameter space in which omnigeneous stellarators are possible is larger than previously expected.

  13. Measurement of radiative widths at COMPASS

    CERN Document Server

    Krämer, Markus

    2014-01-01

    COMPASS is a multipurpose fixed-target experiment at the CERN SPS, which addresses a wide variety of physic topics, in particular the structure and spectroscopy of hadrons. Diffractive dissociation of pions on nuclear targets allows for clean access to the light meson spectrum. In addition meson production can be studied in pion-photon reactions via the Primakoff effect, where high-energetic pions react with the quasi-real photon field surrounding the target nuclei. At low pion-photon center-of-mass energies, these reactions are governed by chiral dynamics and contain information relevant for chiral perturbation theory. At higher energies, resonances are produced and their radiative coupling is investigated. During a short run using a 190GeV $\\pi^-$ beam and a lead target in the year 2004, 3 million exclusive $\\pi^-\\pi^-\\pi^+$ events in the region of small squared four-momentum transfer, i.e. t' < 0:01GeV$^2$=c$^2$, have been recorded. At very low t' < 0:001GeV$^2$=c$^2$, the contribution from electroma...

  14. COMPASS polarized target for Drell-Yan

    CERN Document Server

    Pešek, M

    2014-01-01

    In the COMPASS Drell–Yan experiment the pion beam with momen tum of 190 GeV/ c and in- tensity up to 10 8 pions/s will interact with transversely polarized proton t arget producing muon pair via Drell–Yan process. The solid-state NH 3 will be polarized by dynamic nuclear polar- ization. Maximum polarization reached during data taking i s expected to be up to 90%. The non-interacting beam and other particles produced inside t he target will be stopped in the hadron absorber after the target. Two target cells, sepparated by a 20 cm gap in between, each 55 cm long and 4 cm in diameter give the target material volume about 691 cm 3 . The target platform needs to be moved by 2.3 m in upstream dire ction from the position used in previous experiments in order to accomodate the absorber. D uring the beam time higher radiation is expected in the area of the control room. Thus a new target r emote control system is needed. The target magnet is undergoing a substantial upgrade. Drell–Yan data taking is expected t...

  15. GARFIELD Computer Program Simulation of the COMPASS Drift Chamber 5

    Science.gov (United States)

    Oh, Seung Joon

    2014-09-01

    COMPASS is a nuclear physics experiment at the Super Proton Synchrotron (SPS) at CERN. The purpose of COMPASS is the study of hadron structure and hadron spectroscopy with high intensity muon and hadron beams. To further study the Drell-Yan process in scattering pion beams off polarized proton targets, COMPASS requires sophisticated tracking devices to determine the trajectory of scattered charged muon pairs. The University of Illinois at Urbana-Champaign is currently constructing the Drift Chamber 5 (DC5) to replace old straw-tube tracking detectors in the COMPASS spectrometer. DC5 is composed of 8 layers of anode and 13 layers of cathode frames made out of G10, a fiberglass-epoxy composite. The high rates for the Drell-Yan measurement require a small drift cell and precise mechanical tolerances have to meet in order to achieve good position resolution. GARFIELD simulations were carried out to study the impact of mechanical tolerances on the drift chamber performance in particular the position resolution that can be reached. The details of the DC5 GARFIELD simulation and results for signal development and position resolution will be presented. COMPASS is a nuclear physics experiment at the Super Proton Synchrotron (SPS) at CERN. The purpose of COMPASS is the study of hadron structure and hadron spectroscopy with high intensity muon and hadron beams. To further study the Drell-Yan process in scattering pion beams off polarized proton targets, COMPASS requires sophisticated tracking devices to determine the trajectory of scattered charged muon pairs. The University of Illinois at Urbana-Champaign is currently constructing the Drift Chamber 5 (DC5) to replace old straw-tube tracking detectors in the COMPASS spectrometer. DC5 is composed of 8 layers of anode and 13 layers of cathode frames made out of G10, a fiberglass-epoxy composite. The high rates for the Drell-Yan measurement require a small drift cell and precise mechanical tolerances have to meet in order to

  16. Compassion Fatigue: An Application of the Concept to Informal Caregivers of Family Members with Dementia

    OpenAIRE

    Anderson, Ruth A.; Day, Jennifer R.

    2011-01-01

    Introduction. Compassion fatigue is a concept used with increasing frequency in the nursing literature. The objective of this paper is to identify common themes across the literature and to apply these themes, and an existing model of compassion fatigue, to informal caregivers for family members with dementia. Findings. Caregivers for family members with dementia may be at risk for developing compassion fatigue. The model of compassion fatigue provides an informative framework for understandi...

  17. Embodying self-compassion within virtual reality and its effects on patients with depression

    OpenAIRE

    Falconer, C. J.; Rovira, A.; King, J A; Gilbert, P; Antley, A.; Fearon, P.; Ralph, N.; Slater, M.; Brewin, C. R.

    2016-01-01

    Background: Self-criticism is a ubiquitous feature of psychopathology and can be combatted by increasing levels of self-compassion. However, some patients are resistant to self-compassion. Aims: To investigate whether the effects of self-identification with virtual bodies within immersive virtual reality could be exploited to increase self-compassion in patients with depression. Method: We developed an 8-minute scenario in which 15 patients practised delivering compassion in one virtual...

  18. Stellar feedback efficiencies: supernovae versus stellar winds

    CERN Document Server

    Fierlinger, Katharina M; Ntormousi, Evangelia; Fierlinger, Peter; Schartmann, Marc; Ballone, Alessandro; Krause, Martin G H; Diehl, Roland

    2015-01-01

    Stellar winds and supernova (SN) explosions of massive stars ("stellar feedback") create bubbles in the interstellar medium (ISM) and insert newly produced heavy elements and kinetic energy into their surroundings, possibly driving turbulence. Most of this energy is thermalized and immediately removed from the ISM by radiative cooling. The rest is available for driving ISM dynamics. In this work we estimate the amount of feedback energy retained as kinetic energy when the bubble walls have decelerated to the sound speed of the ambient medium. We show that the feedback of the most massive star outweighs the feedback from less massive stars. For a giant molecular cloud (GMC) mass of 1e5 solar masses (as e.g. found in the Orion GMCs) and a star formation efficiency of 8% the initial mass function predicts a most massive star of approximately 60 solar masses. For this stellar evolution model we test the dependence of the retained kinetic energy of the cold GMC gas on the inclusion of stellar winds. In our model w...

  19. Compassion fatigue and burnout: prevalence among oncology nurses.

    Science.gov (United States)

    Potter, Patricia; Deshields, Teresa; Divanbeigi, Joyce; Berger, Julie; Cipriano, Doreen; Norris, Lori; Olsen, Sarah

    2010-10-01

    This descriptive, cross-sectional survey was conducted in inpatient nursing units and outpatient clinics in a cancer center in the midwestern United States. The sample of 153 healthcare providers included RNs, medical assistants, and radiology technicians. The fourth revision of the 30-item Professional Quality of Life (ProQOL R-IV) scale was used for measuring compassion fatigue, compassion satisfaction, and burnout. A series of cross tab analyses examined the relationship between participant demographics and three ProQOL R-IV subscales. The study sample scored similarly on compassion satisfaction and burnout when compared with participants who used the ProQOL R-IV in previous studies. Value exists in analyzing the prevalence of burnout and compassion fatigue among oncology healthcare providers. Understanding the needs of distinct demographic groups offers valuable direction for intervention program development. Applying internal evidence in the design of a relevant stress-reduction program will better equip healthcare providers to recognize and manage compassion fatigue and burnout. PMID:20880809

  20. Compassion in Soranus' Gynecology and Caelius Aurelianus' On Chronic Diseases.

    Science.gov (United States)

    Porter, Amber J

    2016-01-01

    Compassion is considered an important quality for a successful physician today, but did ancient physicians display and value this emotion? How did they feel when faced with the pain and suffering of their patients? How did their patients' emotions affect their own? Many ancient physicians are not well-known for expressions of compassion in their writings; however, this seems to change in the second century AD. One medical writer who exemplifies this change is Soranus of Ephesus (c. 98-138 AD). In his Gynecology, there are a number of passages where compassion is addressed or expressed (such as the chapters on the qualities of the best midwife, the symptom of pica, childbirth, and superstition). The same points can be made of Soranus' On Chronic Diseases, preserved to some extent by the Latin version and adaptation by fifth century AD medical writer Caelius Aurelianus (see, for example, the chapters on chronic headache, mania and elephantiasis). Soranus and Caelius display compassion, understanding, and flexibility of approach when dealing with patient issues; they show themselves willing to change their medical technique when they see that it is doing more harm or discomfort than good. In Soranus and Caelius, we have an image of a physician who acknowledges and is aware of their patients' emotions, beliefs and attitudes, and who exhibits compassion for them. PMID:26946682

  1. Quantitative vertebral compression fracture evaluation using a height compass

    Science.gov (United States)

    Yao, Jianhua; Burns, Joseph E.; Wiese, Tatjana; Summers, Ronald M.

    2012-03-01

    Vertebral compression fractures can be caused by even minor trauma in patients with pathological conditions such as osteoporosis, varying greatly in vertebral body location and compression geometry. The location and morphology of the compression injury can guide decision making for treatment modality (vertebroplasty versus surgical fixation), and can be important for pre-surgical planning. We propose a height compass to evaluate the axial plane spatial distribution of compression injury (anterior, posterior, lateral, and central), and distinguish it from physiologic height variations of normal vertebrae. The method includes four steps: spine segmentation and partition, endplate detection, height compass computation and compression fracture evaluation. A height compass is computed for each vertebra, where the vertebral body is partitioned in the axial plane into 17 cells oriented about concentric rings. In the compass structure, a crown-like geometry is produced by three concentric rings which are divided into 8 equal length arcs by rays which are subtended by 8 common central angles. The radius of each ring increases multiplicatively, with resultant structure of a central node and two concentric surrounding bands of cells, each divided into octants. The height value for each octant is calculated and plotted against octants in neighboring vertebrae. The height compass shows intuitive display of the height distribution and can be used to easily identify the fracture regions. Our technique was evaluated on 8 thoraco-abdominal CT scans of patients with reported compression fractures and showed statistically significant differences in height value at the sites of the fractures.

  2. New results on transverse spin asymmetries from COMPASS

    CERN Document Server

    Parsamyan, Bakur

    2015-01-01

    One of the important objectives of the COMPASS experiment is the exploration of transverse spin structure of nucleon via spin (in)dependent azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS) of polarized leptons (and soon also Drell-Yan (DY) reactions with $\\pi^-$) off transversely polarized target. For this purpose a series of measurements were made in COMPASS, using 160 GeV/c longitudinally polarized muon beam and polarized $^6LiD$ and $NH_3$ targets and are foreseen with 190 GeV/c $\\pi^-$ beam on polarized $NH_3$. The experimental results obtained by COMPASS for azimuthal effects in SIDIS play an important role in the general understanding of the three-dimensional nature of the nucleon and are widely used in theoretical analyses and global data fits. Future first ever polarized DY-data from COMPASS compared with SIDIS results will open a new chapter probing general principles of QCD TMD-formalism. In this review main focus will be given to the very recent COMPASS results obtained for...

  3. SIDIS transverse spin azimuthal asymmetries at COMPASS: Multidimensional analysis

    CERN Document Server

    Parsamyan, Bakur

    2015-01-01

    Exploration of transverse spin structure of the nucleon via study of the spin (in)dependent azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS) and Drell-Yan (DY) reactions is one of the main aspects of the broad physics program of the COMPASS experiment (CERN, Switzerland). In past decade COMPASS has collected a considerable amount of polarized deuteron and proton SIDIS data while 2014 and 2015 runs were dedicated to the Drell-Yan measurements. Results on SIDIS azimuthal effects provided so far by COMPASS play an important role in general understanding of the three-dimensional nature of the nucleon. Giving access to the entire "twist-2" set of transverse momentum dependent (TMD) parton distribution functions (PDFs) and fragmentation functions (FFs) COMPASS data are being widely used in phenomenological analyses and experimental data fits. Recent unique and first ever x-$Q^{2}$-z-pT multidimensional results for transverse spin asymmetries obtained by COMPASS serve as a direct and unprece...

  4. New results on transverse spin asymmetries from COMPASS

    Directory of Open Access Journals (Sweden)

    Parsamyan Bakur

    2015-01-01

    Full Text Available One of the important objectives of the COMPASS experiment is the exploration of transverse spin structure of nucleon via spin (independent azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS of polarized leptons (and soon also Drell-Yan (DY reactions with π− off transversely polarized target. For this purpose a series of measurements were made in COMPASS, using 160 GeV/c longitudinally polarized muon beam and polarized 6 LiD and NH3 targets and are foreseen with 190 GeV/c π− beam on polarized NH3. The experimental results obtained by COMPASS for azimuthal effects in SIDIS play an important role in the general understanding of the three-dimensional nature of the nucleon and are widely used in theoretical analyses and global data fits. Future first ever polarized DY-data from COMPASS compared with SIDIS results will open a new chapter probing general principles of QCD TMD-formalism. In this review main focus will be given to the very recent COMPASS results obtained for SIDIS transverse spin asymmetries from four “Drell-Yan” Q2-ranges.

  5. Burnout, compassion fatigue, and compassion satisfaction among staff in community-based mental health services.

    Science.gov (United States)

    Rossi, Alberto; Cetrano, Gaia; Pertile, Riccardo; Rabbi, Laura; Donisi, Valeria; Grigoletti, Laura; Curtolo, Cristina; Tansella, Michele; Thornicroft, Graham; Amaddeo, Francesco

    2012-12-30

    Providing care to individuals with complex mental health needs can be stressful. However, little research has focused on the emotional, cognitive, and physical consequences of providing mental health care. The aim of this study is to assess burnout (BO), compassion fatigue (CF) and compassion satisfaction (CS) among staff at the four community-based mental health services (CMHS) of Verona, Italy. All staff were asked to complete anonymously the Professional Quality of Life Scale, the General Health Questionnaire, and a socio-demographic questionnaire. In total 260 staff participated (a response rate of 84%). Psychiatrists and social workers were the professionals with the highest levels of BO and CF. Workers with psychological distress reported both higher BO and CF scores, and lower levels of CS. A significant increase in the BO and CF scores was also detected for each extra year spent working in a CMHS. A higher level of CF was associated with female and having been experienced one negative life event in the previous year. These findings are useful for health managers and team leaders to identify factors affecting the professional quality of life of mental healthcare staff, and can provide a rationale for detecting staff at risk for developing negative work-related outcomes. PMID:22951335

  6. Compassion Fatigue Risk and Self-Care Practices among Residential Treatment Center Childcare Workers

    Science.gov (United States)

    Eastwood, Callum D.; Ecklund, Kathryn

    2008-01-01

    Exploration of the presence of risk for compassion fatigue among residential childcare workers (RCW) at residential treatment facilities and the relationship between self-care practices and compassion fatigue were explored. Using the Professional Quality of Life Survey (ProQOL-R III) to assess compassion fatigue, burnout, and compassion…

  7. Is compassion possible in a market-led NHS?

    Science.gov (United States)

    Flynn, Maria; Mercer, Dave

    The principle of compassionate care is increasingly seen as the core element of good nursing practice. However, recent media reports have focused on the "compassion deficit". We carried out a review of national and international evidence on core professional values, which showed that caring and compassion are inherent nursing values. While the development of these values is influenced by training and role modelling, the main influence is the organisation and culture in which nurses work. This article discusses the findings of the review in relation to the national debate around compassionate care within an NHS that is being fundamentally changed. We suggest any failure in compassion is more likely to be due to government health policy and NHS organisational culture than to any shortcomings of nurses or nursing practice. PMID:23513933

  8. Compassion fatigue among registered nurses: connecting theory and research.

    Science.gov (United States)

    Sheppard, Kate

    2015-02-01

    Unresolved compassion fatigue often causes physical and emotional exhaustion, and can significantly impair job performance. It is also known to cause increased absenteeism and even turnover among health care providers such as registered nurses. Often those experiencing compassion fatigue attempt to self-medicate in order to numb the intense emotions, and distance themselves from patients, colleagues, friends, and even family. This article describes the challenges of applying one widely used conceptual model to research among nurses who are at risk for experiencing this important and debilitating phenomenon. Through two qualitative studies that explored compassion fatigue among registered nurses, symptoms were identified that fit within the conceptual model. Several additional elements were not adequately captured by the conceptual model, and the term was perceived as being stigmatizing. PMID:25434861

  9. Stellarator theory and stability

    International Nuclear Information System (INIS)

    This report summarizes our work in the past year on stellarator transport theory and stability. We have developed two methods of calculating diffusion rates due to ripple transport: a ''hybrid'' bounce-averaged/guiding-center Monte Carlo code, and a numerical method of solving the bounce-averaged Fokker-Planck equation. We have modified a one-dimensional transport code to describe the Wisconsin stellarator experiments and applied it to interpret experimental results, and we have studied stability in stellarators by writing a computer code which solves the linearized ''double-adiabatic'' equations as an initial value problem. 20 refs., 7 figs

  10. Micromegas characterization and gluons polarization measurement with COMPASS

    International Nuclear Information System (INIS)

    The COMPASS experiment will determine the gluon polarization in the nucleon ΔG/G from the double helicity asymmetry measured in the scattering of a polarized 160 GeV muon beam on a longitudinally polarized deuteron target. The outgoing particles are detected in a high resolution, high flux capability spectrometer. Between the target and the first spectrometer dipole magnet, the tracks reconstruction heavily relies on Micromegas, a microstrip gaseous detector developed at DAPNIA and used for the first time on a high energy experiment. The instrumental part of this work presents the commissioning of the 12 planes of Micromegas installed in COMPASS. It is shown that these detectors satisfy the requirements from COMPASS, with an efficiency of 96.5%, a space resolution of 93 μm and a time resolution of 10.0 ns. COMPASS accesses the gluons through the photon-gluon fusion, in which the incident muon merges with a gluon from the nucleon, giving rise to a qq-bar pair. This reaction can be tagged either by detecting a charmed hadron in the final state, or by detecting a pair of high transverse momentum hadrons. This thesis presents the first asymmetry measurement of COMPASS, performed on a high transverse momentum sample of events collected in 2002. The preliminary result is (A//γ*d)μd→hh ≡ (A///D)μd→hh = -0.065 ± 0.036(stat.) ± 0.005(syst.). A Monte-Carlo simulation of the COMPASS experiment, based on the event generator PYTHIA, allows to obtain a first estimate of the gluon polarization. (author)

  11. A molecular compass for bird navigation

    Science.gov (United States)

    Hore, Peter

    2015-03-01

    Migratory birds travel spectacular distances, navigating and orienting by a variety of means, most of which are poorly understood. Among them is a remarkable ability to perceive the intensity and direction of the Earth's magnetic field. Biologically credible mechanisms for the sensing of such weak fields (25-65 microtesla) are scarce and in recent years just two proposals have emerged as frontrunners. One involves biogenic iron-containing nanoparticles; the other relies on the magnetic sensitivity of short-lived photochemical intermediates known as radical pairs. The latter began to attract attention following the proposal 15 years ago that the necessary physics and chemistry could take place in the bird's retina in specialised photoactive proteins called cryptochromes. The coherent dynamics of the electron-nuclear spin systems of pairs of photo-induced radicals is conjectured to form the basis of the sensing mechanism even though the interaction of an electron spin with the geomagnetic field is six orders of magnitude smaller than the thermal energy. The possibility that slowing decohering, entangled electron spins could form the basis of an important sensory mechanism has qualified radical pair magnetoreception for a place under the umbrella of ``Quantum Biology.'' In this talk, I will introduce the radical pair mechanism, comment on the roles of entanglement and quantum coherence, outline some of the experimental evidence for the cryptochrome hypothesis, and summarize what still needs to be done to determine whether birds (and maybe other animals) really do use a chemical compass to find their way around. This work was supported by grants from DARPA, AFOSR, ERC and the EMF Biological Research Trust.

  12. Quantum control and entanglement in a chemical compass

    CERN Document Server

    Cai, Jianming; Briegel, Hans J

    2009-01-01

    The radical pair mechanism is one of the two main hypotheses to explain the navigability of animals in weak magnetic fields, enabling e.g. birds to see the Earth's magnetic field. We show how quantum control can be used to either enhance or reduce the performance of such a chemical compass, providing a route to further test this hypothesis experimentally. We investigate the dynamics of quantum entanglement in this model, and demonstrate intriguing connections between radical-pair entanglement and the magnetic field sensitivity of the compass. The nature of the nuclear-spin environment plays an essential role for the observed effects.

  13. Fast photon-detection for COMPASS RICH-1

    CERN Document Server

    Chiosso, Michela; Alexeev, M; Angerer, H; Birsa, R; Bordalo, P; Bradamante, F; Bressan, A; Ciliberti, P; Colantoni, M L; Dafni, T; Dalla Torre, S; Delagnes, E; Denisov, O; Deschamps, H; Diaz, V; Dibiase, N; Duic, V; Eyrich, W; Ferrero, A; Finger, M; Finger Jr, M; Fisher, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; von Harrac, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K; Kolosov, V N; Konorov, I; Kramer, D; Kunne, F; Lehmann, A; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nähle, O; Neyret, D; Nerling, F; Panebianco, S; Panzieri, D; Paul, S; Pesaro, G; Pizzolotto, C; Polak, J; Rebourgeard, P; Robinet, P; Rocco, E; Schiavon, P; Schill, C; Schoenmaier, W; Schröder, W; Silva, L; Slunecka, M; Sozzi, F; Steiger, L; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2008-01-01

    A fast photon-detection system for the detector RICH-1 of the COMPASS Experiment at CERN SPS is in operation since the 2006 run. It is based on the use of Multi-Anode Photomultipliers (MAPMTs) coupled to individual fused silica lens telescopes and fast read-out electronics. It has been designed taking into account the high photon flux in the central region of the detector and the high rate requirements of the COMPASS Experiment. We present the photon-detection design and construction, together with its characterization and measured performances based on the data collected in 2006.

  14. Ocelli: A Celestial Compass in the Desert Ant Cataglyphis

    Science.gov (United States)

    Fent, Karl; Wehner, Rudiger

    1985-04-01

    In addition to multifaceted lateral compound eyes, most insects possess three frontal eyes called ocelli. Each ocellus has a single lens, as does the vertebrate eye. The ocelli of some flying insects, locusts and dragonflies, have been shown to function as horizon detectors involved in the visual stabilization of course. In a walking insect, the desert ant Cataglyphis, it is now shown that the ocelli can read compass information from the blue sky. When the ant's compound eyes are occluded and both sun and landmarks are obscured, the ocelli, using the pattern of polarized light in the sky as a compass cue, help in guiding the ant back home.

  15. Synchrotron Radiation from Runaway Electrons in COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Vlainić, M.; Vondráček, Petr; Mlynář, Jan; Weinzettl, Vladimír; Ficker, Ondřej; Varavin, Mykyta; Papřok, Richard; Imríšek, Martin; Havlíček, Josef; Pánek, Radomír; Noterdaeme, J.-M.

    Vol. 39E. Mulhouse : European Physical Society, 2015, P4.108-P4.108. ISBN 2-914771-98-3. - (Europhysics Conference Abstracts. ECA. 39E). [EPS 2015 Conference on Plasma Physics/42./. Lisabon (PT), 22.06.2015-26.06.2015] R&D Projects: GA MŠk(CZ) LM2011021 EU Projects: European Commission(XE) 633053 Institutional support: RVO:61389021 Keywords : plasma COMPASS * tokamak * synchrotron radiation runaway electrons * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics http://ocs.ciemat.es/EPS2015PAP/pdf/P4.108.pdf

  16. Robust signals from a quantum-based magnetic compass sensor

    CERN Document Server

    Procopio, Maria

    2013-01-01

    A quantum-based magnetic compass sensor, mediated through radical pair reactions, has been suggested to underlie the sensory ability of migrating birds to receive directional information from the geomagnetic field. Here we extend the currently available models by considering the effects of slow fluctuations in the nuclear spin environment on the directional signal. We quantitatively evaluate the robustness of signals under fluctuations on a timescale longer than the lifetime of a radical pair, utilizing two models of radical pairs. Our results suggest design principles for building a radical-pair based compass sensor that is both robust and highly directional sensitive.

  17. First dedicated observations of runaway electrons in the COMPASS tokamak

    Directory of Open Access Journals (Sweden)

    Vlainić Miloš

    2015-06-01

    Full Text Available Runaway electrons present an important part of the present efforts in nuclear fusion research with respect to the potential damage of the in-vessel components. The COMPASS tokamak a suitable tool for the studies of runaway electrons, due to its relatively low vacuum safety constraints, high experimental flexibility and the possibility of reaching the H-mode D-shaped plasmas. In this work, results from the first experimental COMPASS campaign dedicated to runaway electrons are presented and discussed in preliminary way. In particular, the first observation of synchrotron radiation and rather interesting raw magnetic data are shown.

  18. Trends of Stellar Entropy along Stellar Evolution

    CERN Document Server

    de Avellar, Marcio G B; Horvath, Jorge E

    2015-01-01

    This paper is devoted to discuss the difference in the thermodynamic entropy budget {\\it per baryon} in each type of stellar object found in Universe. We track and discuss the actual {\\it decrease} of the stored baryonic thermodynamic entropy from the most primitive molecular cloud up to the final fate of matter in the black holes, passing through evolved states of matter as found in white dwarfs and neutron stars. We then discuss the case of actual stars of different masses throughout their {\\it evolution}, clarifying the role of virial equilibrium condition for the decrease of the entropy and related issues. Finally, we discuss how gravity ultimately drives composition, hence structural changes along the stellar evolution all the way until the ultimate collapse to black holes, which may increase dramatically their entropy because of the gravitational contribution itself.

  19. ComPASS : a tool for distributed parallel finite volume discretizations on general unstructured polyhedral meshes

    Directory of Open Access Journals (Sweden)

    Dalissier E.

    2013-12-01

    Full Text Available The objective of the ComPASS project is to develop a parallel multiphase Darcy flow simulator adapted to general unstructured polyhedral meshes (in a general sense with possibly non planar faces and to the parallelization of advanced finite volume discretizations with various choices of the degrees of freedom such as cell centres, vertices, or face centres. The main targeted applications are the simulation of CO2 geological storage, nuclear waste repository and reservoir simulations. The CEMRACS 2012 summer school devoted to high performance computing has been an ideal framework to start this collaborative project. This paper describes what has been achieved during the four weeks of the CEMRACS project which has been focusing on the implementation of basic features of the code such as the distributed unstructured polyhedral mesh, the synchronization of the degrees of freedom, and the connection to scientific libraries including the partitioner METIS, the visualization tool PARAVIEW, and the parallel linear solver library PETSc. The parallel efficiency of this first version of the ComPASS code has been validated on a toy parabolic problem using the Vertex Approximate Gradient finite volume spatial discretization with both cell and vertex degrees of freedom, combined with an Euler implicit time integration.

  20. Stellar Chromospheric Activity

    Directory of Open Access Journals (Sweden)

    Hall Jeffrey C.

    2008-03-01

    Full Text Available The Sun, stars similar to it, and many rather dissimilar to it, have chromospheres, regions classically viewed as lying above the brilliant photosphere and characterized by a positive temperature gradient and a marked departure from radiative equilibrium. Stellar chromospheres exhibit a wide range of phenomena collectively called activity, stemming largely from the time evolution of their magnetic fields and the mass flux and transfer of radiation through the complex magnetic topology and the increasingly optically thin plasma of the outer stellar atmosphere. In this review, I will (1 outline the development of our understanding of chromospheric structure from 1960 to the present, (2 discuss the major observational programs and theoretical lines of inquiry, (3 review the origin and nature of both solar and stellar chromospheric activity and its relationship to, and effect on, stellar parameters including total energy output, and (4 summarize the outstanding problems today.

  1. Self-Compassion in Relation to Self-Esteem, Self-Efficacy and Demographical Aspects

    Directory of Open Access Journals (Sweden)

    Luciana Karine de Souza

    2016-08-01

    Full Text Available Abstract This study investigated relationships between self-compassion, self-efficacy, and self-esteem, as well as age and sex differences and other sociodemographic variables in relation to self-compassion. Four-hundred and thirty-two Brazilian adults (50% women from nearly all country states participated in the study filling out a sociodemographic survey and three scales: self-compassion, self-efficacy, and self-esteem. Comparisons of means between self-compassion and pairs of groups designed by sociodemographic data showed higher self-compassion in men, people aged from 31 to 66 years-old, not under psychiatric medication, without a job, and with children. Results also showed that self-compassion is highly correlated with self-esteem and self-efficacy. We highlight that results are sample dependent and further studies on self-compassion need to be conducted in Brazil.

  2. Self-Compassion, Emotion Regulation and Stress among Australian Psychologists: Testing an Emotion Regulation Model of Self-Compassion Using Structural Equation Modeling.

    Science.gov (United States)

    Finlay-Jones, Amy L; Rees, Clare S; Kane, Robert T

    2015-01-01

    Psychologists tend to report high levels of occupational stress, with serious implications for themselves, their clients, and the discipline as a whole. Recent research suggests that self-compassion is a promising construct for psychologists in terms of its ability to promote psychological wellbeing and resilience to stress; however, the potential benefits of self-compassion are yet to be thoroughly explored amongst this occupational group. Additionally, while a growing body of research supports self-compassion as a key predictor of psychopathology, understanding of the processes by which self-compassion exerts effects on mental health outcomes is limited. Structural equation modelling (SEM) was used to test an emotion regulation model of self-compassion and stress among psychologists, including postgraduate trainees undertaking clinical work (n = 198). Self-compassion significantly negatively predicted emotion regulation difficulties and stress symptoms. Support was also found for our preliminary explanatory model of self-compassion, which demonstrates the mediating role of emotion regulation difficulties in the self-compassion-stress relationship. The final self-compassion model accounted for 26.2% of variance in stress symptoms. Implications of the findings and limitations of the study are discussed. PMID:26207900

  3. Exploring self-compassion as a refuge against recalling the body-related shaming of caregiver eating messages on dimensions of objectified body consciousness in college women.

    Science.gov (United States)

    Daye, Chesnee A; Webb, Jennifer B; Jafari, Nadia

    2014-09-01

    Guided by an overarching body-related shame regulation framework, the present investigation examined the associations between caregiver eating messages and dimensions of objectified body consciousness and further explored whether self-compassion moderated these links in a sample of 322 U.S. college women. Correlational findings indicated that retrospective accounts of restrictive/critical caregiver eating messages were positively related to body shame and negatively related to self-compassion and appearance control beliefs. Recollections of experiencing pressure to eat from caregivers were positively correlated with body shame and inversely associated with appearance control beliefs. Higher self-compassion was associated with lower body shame and body surveillance. Self-compassion attenuated the associations between restrictive/critical caregiver eating messages and both body surveillance and body shame. Implications for advancing our understanding of the adaptive properties of a self-compassionate self-regulatory style in mitigating recall of familial body-related shaming on the internalized body-related shame regulating processes of body objectification in emerging adulthood are discussed. PMID:25195124

  4. The experience of building and operating COMPASS RICH-1

    CERN Document Server

    Birsa, R; Rocco, E; Schiavon, P; Kramer, D; Schroder, W; Dafni, T; Tessarotto, F; Bressan, A; Schill, C; Deschamps, H; Mann, A; Sozzi, F; Colantoni, M; Dibiase, N; Abbon, P; Svec, M; Delagnes, E; Ketzer, B; Joosten, R; Steiger, L; Ciliberti, P; Konigsmann, K; Maggiora, A; Kolosov, V N; Giorgi, M; Sbrizzai, G; Nahle, O; Kunne, F; Sulc, M; Teufel, A; Paul, S; Neyret, D; Rebourgeard, P; Menon, G; Dalla Torre, S; Hagemann, R; Slunecka, M; Martin, A; Magnon, A; Takekawa, S; Finger, M; Bradamante, F; Heinsius, F H; Nerling, F; Gerassimov, S; Polak, J; Alexeev, M; Pizzolotto, C; Chiosso, M; Gobbo, B; Angerer, H; Denisov, O; Ferrero, A; Baum, G; Franco, C; Lehmann, A; Bordalo, P; Duic, V; Konorov, I; Mutter, A; Levorato, S; Robinet, F; von Harrach, D; Fischer, H; Schoenmeier, P; Pesaro, G; Wollny, H; Panzieri, D

    2011-01-01

    COMPASS RICH-1 is a large size gaseous Imaging Cherenkov Detector providing hadron identification in the range from 3 to 55 GeV/c, in the wide acceptance spectrometer of the COMPASS Experiment at CERN SPS. It uses a 3 m long C(4)F(10) radiator, a 21 m(2) large VUV mirror surface and two kinds of photon detectors: MAPMTs and MWPCs with CsI photocathodes, covering a total of 5.5 m(2). It is in operation since 2002 and its performance has increased in time thanks to progressive optimization and mostly to a major upgrade which was implemented in 2006. The main characteristics of COMPASS RICH-1 components are described and some specific aspects related to the radiator gas system, the mirror alignment, the MWPC electrical stability and the readout electronics are discussed. Some key features of the event reconstruction and the PID analysis are presented together with results from the COMPASS RICH-1 performance characterization study. (C) 2010 Elsevier B.V. All rights reserved.

  5. Characterisation of optical components of the COMPASS RICH1 detector

    CERN Document Server

    D'Ambrosio, C; Laub, M; Piedigrossi, D; Finger, M H; Zichy, J A

    2001-01-01

    The COMPASS RICH1 detector is under construction at CERN. We participated to the preparation of its optical system by characterising its spherical mirrors. In the article, the experimental set-up for mirror characterisation is described together with the obtained results. (5 refs).

  6. Post-disruptive runaway electron beams in the COMPASS tokamak

    Czech Academy of Sciences Publication Activity Database

    Vlainić, M.; Mlynář, Jan; Cavalier, Jordan; Weinzettl, Vladimír; Papřok, Richard; Imríšek, Martin; Ficker, Ondřej; Varavin, Mykyta; Noterdaeme, J.M.

    2015-01-01

    Roč. 81, č. 5 (2015), s. 475810506-475810506. ISSN 0022-3778 R&D Projects: GA MŠk(CZ) LM2011021 Institutional support: RVO:61389021 Keywords : plasma * tokamak * runaway electron beam * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 0.864, year: 2014

  7. Exotic skyrmion crystals in chiral magnets with compass anisotropy

    Science.gov (United States)

    Chen, J. P.; Zhang, Dan-Wei; Liu, J. -M.

    2016-01-01

    The compass-type anisotropy appears naturally in diverse physical contexts with strong spin-orbit coupling (SOC) such as transition metal oxides and cold atomic gases etc, and it has been receiving substantial attention. Motivated by recent studies and particularly recent experimental observations on helimagnet MnGe, we investigate the critical roles of this compass-type anisotropy in modulating various spin textures of chiral magnets with strong SOC, by Monte Carlo simulations based on a classical Heisenberg spin model with Dzyaloshinsky-Moriya interaction and compass anisotropy. A phase diagram with emergent spin orders in the space of compass anisotropy and out-of-plane magnetic field is presented. In this phase diagram, we propose that a hybrid super-crystal structure consisting of alternating half-skyrmion and half-anti-skyrmion is the possible zero-field ground state of MnGe. The simulated evolution of the spin structure driven by magnetic field is in good accordance with experimental observations on MnGe. Therefore, this Heisenberg spin model successfully captures the main physics responsible for the magnetic structures in MnGe, and the present work may also be instructive to research on the magnetic states in other systems with strong SOC. PMID:27377149

  8. Measurement of the Polarised Drell-Yan process at COMPASS

    Science.gov (United States)

    Quaresma, Márcia

    2014-11-01

    The COMPASS experiment at CERN has been playing an important role in the studies of the spin content of the nucleon. The Semi-Inclusive Deep Inelastic Scattering (SIDIS) process gives access to the transverse momentum dependent parton distribution functions (TMDs) by the measurement of azimuthal asymmetries that have been studied in COMPASS and published in recent years. TMDs are also accessible by the transversely polarised Drell-Yan (DY) process which will be measured in COMPASS. This will be the first ever polarised DY measurement. The valence quarks region will be dominant due to the use of a negative pion beam at 190 GeV/c momentum impinging on a transversely polarised ammonia target. The QCD prediction that Sivers TMD change sign when accessed by SIDIS or by DY will be checked by the COMPASS measurement. The data taking is scheduled to start in the fall of this year. After one year of data collection, a statistical error below 2% in the azimuthal asymmetry related to the u quark Sivers function is expected. Details of the final experimental setup will be presented.

  9. Exotic skyrmion crystals in chiral magnets with compass anisotropy

    Science.gov (United States)

    Chen, J. P.; Zhang, Dan-Wei; Liu, J.-M.

    2016-07-01

    The compass-type anisotropy appears naturally in diverse physical contexts with strong spin-orbit coupling (SOC) such as transition metal oxides and cold atomic gases etc, and it has been receiving substantial attention. Motivated by recent studies and particularly recent experimental observations on helimagnet MnGe, we investigate the critical roles of this compass-type anisotropy in modulating various spin textures of chiral magnets with strong SOC, by Monte Carlo simulations based on a classical Heisenberg spin model with Dzyaloshinsky-Moriya interaction and compass anisotropy. A phase diagram with emergent spin orders in the space of compass anisotropy and out-of-plane magnetic field is presented. In this phase diagram, we propose that a hybrid super-crystal structure consisting of alternating half-skyrmion and half-anti-skyrmion is the possible zero-field ground state of MnGe. The simulated evolution of the spin structure driven by magnetic field is in good accordance with experimental observations on MnGe. Therefore, this Heisenberg spin model successfully captures the main physics responsible for the magnetic structures in MnGe, and the present work may also be instructive to research on the magnetic states in other systems with strong SOC.

  10. Avian magnetic compass: Its functional properties and physical basis

    Directory of Open Access Journals (Sweden)

    Roswitha WILTSCHKO, Wolfgang WILTSCHKO

    2010-06-01

    Full Text Available The avian magnetic compass was analyzed in bird species of three different orders – Passeriforms, Columbiforms and Galliforms – and in three different behavioral contexts, namely migratory orientation, homing and directional conditioning. The respective findings indicate similar functional properties: it is an inclination compass that works only within a functional window around the ambient magnetic field intensity; it tends to be lateralized in favor of the right eye, and it is wavelength-dependent, requiring light from the short-wavelength range of the spectrum. The underlying physical mechanisms have been identified as radical pair processes, spin-chemical reactions in specialized photopigments. The iron-based receptors in the upper beak do not seem to be involved. The existence of the same type of magnetic compass in only very distantly related bird species suggests that it may have been present already in the common ancestors of all modern birds, where it evolved as an all-purpose compass mechanism for orientation within the home range [Current Zoology 56 (3: 265–276, 2010].

  11. Double spin asymmetry in exclusive rho(0) muoproduction at COMPASS

    Czech Academy of Sciences Publication Activity Database

    Alekseev, M.; Alexakhin, V. Yu.; Alexandrov, Yu.; Alexeev, G. D.; Amoroso, A.; Arbuzov, A.; Badelek, B.; Balestra, F.; Ball, J.; Baum, G.; Barth, J.; Bedfer, Y.; Bernet, C.; Bertini, R.; Bettinelli, M.; Birsa, R.; Bisplinghoff, J.; Bordalo, P.; Bradamante, F.; Bravar, A.; Bressan, A.; Brona, G.; Burtin, E.; Bussa, M.; Chapiro, A.; Chiosso, M.; Cicuttin, A.; Colantoni, M.; Costa, S.; Crespo, M.; d'Hose, N.; Dalla Torre, S.; Das, S.; Dasgupta, S. S.; De Masi, R.; Dedek, N.; Denisov, O.; Dhara, L.; Diaz, V.; Dinkelbach, A.; Donskov, S.; Dorofeev, V.; Doshita, N.; Duic, V.; Dünnweber, W.; Eversheim, P.; Eyrich, W.; Fabro, M.; Faessler, M.; Falaleev, V.; Ferrero, A.; Ferrero, L.; Finger, M.; Finger jr., M.; Fischer, H.; Franco, C.; Franz, J.; Friedrich, J.; Frolov, V.; Garfagnini, R.; Gautheron, F.; Gavrichtchouk, O.; Gazda, R.; Gerassimov, S.; Geyer, R.; Giorgi, M.; Gobbo, B.; Goertz, S.; Gorin, A. M.; Grabmüller, S.; Grajek, O.; Grasso, A.; Grube, B.; Gushterski, R.; Guskov, A.; Haas, F.; Hannappel, J.; von Harrach, D.; Hasegawa, T.; Heckmann, J.; Hedicke, S.; Heinsius, F.; Hermann, R.; Hess, C.; Hinterberger, F.; von Hodenberg, M.; Horikawa, N.; Horikawa, S.; Ilgner, C.; Ioukaev, A.; Ishimoto, S.; Ivanov, O.; Ivanshin, Yu.; Iwata, T.; Jahn, R.; Janata, A.; Jasinski, P.; Joosten, R.; Jouravlev, N. I.; Kabuss, E.; Kang, D.; Ketzer, B.; Khaustov, G.; Khokhlov, Y.; Kisselev, Y.; Klein, F.; Klimaszewski, K.; Koblitz, S.; Koivuniemi, J.; Kolosov, V.; Komissarov, E.; Kondo, K.; Königsmann, K.; Konorov, I.; Konstantinov, V.; Korentchenko, A.; Korzenev, A.; Kotzinian, A.; Koutchinski, N.; Kouznetsov, O.; Kravchuk, N.; Kral, A.; Kroumchtein, Z.; Kuhn, R.; Kunne, F.; Kurek, K.; Ladygin, M.; Lamanna, M.; Le Goff, J.; Lednev, A.; Lehmann, A.; Lichtenstadt, J.; Liska, T.; Ludwig, I.; Maggiora, A.; Maggiora, M.; Magnon, A.; Mallot, G.; Mann, A.; Marchand, C.; Marroncle, J.; Martin, A.; Marzec, J.; Massmann, F.; Matsuda, T.; Maximov, A.; Meyer, W.; Mielech, A.; Mikhailov, Y.; Moinester, M.; Mutter, M.; Nähle, O.; Nagaytsev, A.; Nagel, T.; Nassalski, J.; Neliba, S.; Nerling, F.; Neubert, S.; Neyret, D.; Nikolaenko, V.; Nikolaev, K.; Olshevsky, A.; Ostrick, M.; Padee, A.; Pagano, P.; Panebianco, S.; Panknin, R.; Panzieri, D.; Paul, S.; Pawlukiewicz-Kaminska, B.; Peshekhonov, D.; Peshekhonov, V.; Piragino, G.; Platchkov, S.; Pochodzalla, J.; Polak, J.; Polyakov, V.; Pretz, J.; Procureur, S.; Quintans, C.; Rajotte, J.; Rapatsky, V.; Ramos, S.; Reicherz, G.; Richter, A.; Robinet, F.; Rocco, E.; Rondio, E.; Rozhdestvensky, A.; Ryabchikov, D.; Samoylenko, V.; Sandacz, A.; Santos, H.; Sapozhnikov, M.; Sarkar, S.; Savin, I.; Schiavon, P.; Schill, C.; Schmitt, L.; Schönmeier, P.; Schröder, W.; Shevchenko, O.; Siebert, H.; Silva, L.; Sinha, L.; Sissakian, A.; Slunecka, M.; Smirnov, G.; Sosio, S.; Sozzi, F.; Sugonyaev, V.; Srnka, Aleš; Stinzing, F.; Stolarski, M.; Sulc, M.; Sulej, R.; Takabayashi, N.; Tchalishev, V.; Tessaro, S.; Tessarotto, F.; Teufel, A.; Tkatchev, L.; Venugopal, G.; Virius, M.; Vlassov, N.; Vossen, A.; Webb, R.; Weise, E.; Weitzel, Q.; Windmolders, R.; Wirth, S.; Wislicki, W.; Zaremba, K.; Zavertyaev, M.; Zemlyanichkina, E.; Zhao, J.; Ziegler, R.; Zvyagin, A.

    2007-01-01

    Roč. 52, č. 2 (2007), s. 255-265. ISSN 1434-6044 R&D Projects: GA MŠk ME 492 Institutional research plan: CEZ:AV0Z20650511 Keywords : double spin asymmetry * polarized deuterons * scattering * COMPASS Subject RIV: BF - Elementary Particles and High Energy Physics Impact factor: 3.255, year: 2007

  12. Simulation of the first muon filter for the COMPASS spectrometer

    International Nuclear Information System (INIS)

    Performance of the First Muon Filter (μF1) of the COMPASS spectrometer was analyzed. The Monte Carlo simulation of different reactions in final states was done. The construction of the individual detectors of μF1 as well as the total layout of μF1 was optimized

  13. Polarized target for Drell-Yan experiment at COMPASS

    Czech Academy of Sciences Publication Activity Database

    Finger jr., M.; Finger, M.; Matoušek, J.; Pešek, M.; Srnka, Aleš

    Dubna: Joint Institute for Nuclear Research, 2014, s. 385-388. ISBN 978-5-9530-0377-3. [Workshop on High Energy Spin Physics /15./ (DSPIN-13). Dubna (RU), 08.10.2013-12.10.2013] Institutional support: RVO:68081731 Keywords : polarized NH3 target * Drell-Yan process * muon pairs * COMPASS spectrometer Subject RIV: BH - Optics, Masers, Lasers

  14. Psychiatric caregiver stress: clinical implications of compassion fatigue.

    Science.gov (United States)

    Franza, Francesco; Del Buono, Gianfranco; Pellegrino, Ferdinando

    2015-09-01

    The capacity to work productively is a key component of health and emotional well-being. People who work in health care can be exposed to the fatigue of care. Compassion fatigue has been described as an occupational hazard specific to clinical work related severe emotional distress. In our study, we have evaluated compassion fatigue in a mental health group (47 psychiatric staff) and its relationship with inpatients (237 inpatients) affected by some psychiatric disorders. At baseline, the more significant data indicate a high percentage of Job Burnout and Compassion Fatigue in psychiatric nurses (respectively, 39.28%, 28.57%). Significant Compassion Fatigue percentage is present also in psychologist group (36.36%). Finally, in psychiatrists, the exposure to patients increased vicarious trauma (28.57%), but not job burnout. After a year of participation in Balint Groups, the psychiatric staff presented an overall reduction in total mean score in any administered scale (CBI: pBurnout: pprofessionals, and Balint Groups may represent a therapeutic strategy to help health professionals to face difficulties in challenging work environments. PMID:26417788

  15. Measurement of the Polarised Drell-Yan process at COMPASS

    Directory of Open Access Journals (Sweden)

    Quaresma Márcia

    2014-01-01

    Full Text Available The COMPASS experiment at CERN has been playing an important role in the studies of the spin content of the nucleon. The Semi-Inclusive Deep Inelastic Scattering (SIDIS process gives access to the transverse momentum dependent parton distribution functions (TMDs by the measurement of azimuthal asymmetries that have been studied in COMPASS and published in recent years. TMDs are also accessible by the transversely polarised Drell-Yan (DY process which will be measured in COMPASS. This will be the first ever polarised DY measurement. The valence quarks region will be dominant due to the use of a negative pion beam at 190 GeV/c momentum impinging on a transversely polarised ammonia target. The QCD prediction that Sivers TMD change sign when accessed by SIDIS or by DY will be checked by the COMPASS measurement. The data taking is scheduled to start in the fall of this year. After one year of data collection, a statistical error below 2% in the azimuthal asymmetry related to the u quark Sivers function is expected. Details of the final experimental setup will be presented.

  16. Transverse spin azimuthal asymmetries in SIDIS at COMPASS: Multidimensional analysis

    CERN Document Server

    Parsamyan, Bakur

    2015-01-01

    One of the important objectives of the COMPASS experiment (CERN, SPS north area) is the exploration of transverse spin structure of nucleon via study of spin (in)dependent azimuthal asymmetries with semi-inclusive deep inelastic scattering (SIDIS) processes and recently also with Drell-Yan (DY) reactions. In the past twelve years series of measurements were made in COMPASS, using 160 GeV/c longitudinally polarized muon beam and polarized $^6LiD$ and $NH_3$ targets. Drell-Yan measurements with high energy (190 GeV/c) pion beam and transversely polarized $NH_3$ target started in 2014 with a pilot-run have been followed by 140 days of data taking in 2015. The experimental results obtained by COMPASS for azimuthal effects in SIDIS play an important role in the general understanding of the three-dimensional nature of the nucleon and are widely used in theoretical analyses and global data fits. In addition, future first ever polarized DY-data from COMPASS compared with SIDIS results will open a new chapter probing ...

  17. PREFACE: A Stellar Journey A Stellar Journey

    Science.gov (United States)

    Asplund, M.

    2008-10-01

    The conference A Stellar Journey was held in Uppsala, Sweden, 23 27June 2008, in honour of Professor Bengt Gustafsson's 65th birthday. The choice of Uppsala as the location for this event was obvious given Bengt's long-standing association with the city stemming back to his school days. With the exception of a two-year postdoc stint in Copenhagen, five years as professor at Stockholm University and two years as director of the Sigtuna foundation, Bengt has forged his illustrious professional career at Uppsala University. The symposium venue was Museum Gustavianum, once the main building of the oldest university in Scandinavia. The title of the symposium is a paraphrasing of Bengt's popular astronomy book Kosmisk Resa (in English: Cosmic Journey) written in the early eighties. I think this aptly symbolizes his career that has been an astronomical voyage from near to far, from the distant past to the present. The original book title was modified slightly to reflect that most of his work to date has dealt with stars in one way or another. In addition it also gives credit to Bengt's important role as a guiding light for a very large number of students, colleagues and collaborators, indeed for several generations of astronomers. For me personally, the book Kosmisk Resa bears particular significance as it has shaped my life rather profoundly. Although I had already decided to become an astronomer, when I first read the book as a 14-year-old I made up my mind then and there that I would study under Bengt Gustafsson and work on stars. Indeed I have remained true to this somewhat audacious resolution. I suspect that a great number of us have similar stories how Bengt has had a major influence on our lives, whether on the professional or personal level. Perhaps Bengt's most outstanding characteristic is his enthralling enthusiasm. This is equally true whether he is pondering some scientific conundrum, supervising students or performing in front of an audience, be it an

  18. Stellar magnetic activity

    International Nuclear Information System (INIS)

    The stellar emission in the chromospheric Ca II H+K lines is compared with the coronal soft X-ray emission, measuring the effects of non-radiative heating in the outer atmosphere at temperatures differing two orders of magnitude. The comparison of stellar flux densities in Ca II H+K and X-rays is extended to fluxes from the transition-region and the high-temperature chromosphere. The stellar magnetic field is probably generated in the differentially rotating convective envelope. The relation between rotation rate and the stellar level of activity measured in chromospheric, transition-region, and coronal radiative diagnostics is discovered. X-ray observations of the binary λ Andromedae are discussed. The departure of M-type dwarfs from the main relations, and the implications for the structure of the chromospheres of these stars are discussed. Variations of the average surface flux densities of the Sun during the 11-year activity cycle agree with flux-flux relations derived for other cool stars, suggesting that the interpretation of the stellar relations may be furthered by studying the solar analogue in more detail. (Auth.)

  19. Automated Stellar Spectral Classification

    Science.gov (United States)

    Bailer-Jones, Coryn; Irwin, Mike; von Hippel, Ted

    1996-05-01

    Stellar classification has long been a useful tool for probing important astrophysical phenomena. Beyond simply categorizing stars it yields fundamental stellar parameters, acts as a probe of galactic abundance distributions and gives a first foothold on the cosmological distance ladder. The MK system in particular has survived on account of its robustness to changes in the calibrations of the physical parameters. Nonetheless, if stellar classification is to continue as a useful tool in stellar surveys, then it must adapt to keep pace with the large amounts of data which will be acquired as magnitude limits are pushed ever deeper. We are working on a project to automate the multi-parameter classification of visual stellar spectra, using artificial neural networks and other techniques. Our techniques have been developed with 10,000 spectra (B Analysis as a front-end compression of the data. Our continuing work also looks at the application of synthetic spectra to the direct classification of spectra in terms of the physical parameters of Teff, log g, and [Fe/H].

  20. Stellar libraries for Gaia

    International Nuclear Information System (INIS)

    Gaia will observe up to a billion stellar sources. Automated algorithms are under development to derive the atmospheric parameters of all observed spectra, from low resolution optical spectra alone or in synergy with high resolution spectra in the near-IR Ca II triplet region. To do so, a large database of state-of-the-art stellar libraries has been produced for the Gaia community, computed using different codes optimized for specific purposes. The choice to use different spectral codes in different regions of the H-R diagram raises the problem of the coherence of the different spectra, specifically in the transition zones. We present a comparison between the libraries from the point of view of spectra simulations for training the Gaia algorithms. We also present the implementation of these libraries into a Simple Stellar Population code.

  1. Affective and physiological responses to the suffering of others: compassion and vagal activity.

    Science.gov (United States)

    Stellar, Jennifer E; Cohen, Adam; Oveis, Christopher; Keltner, Dacher

    2015-04-01

    Compassion is an affective response to another's suffering and a catalyst of prosocial behavior. In the present studies, we explore the peripheral physiological changes associated with the experience of compassion. Guided by long-standing theoretical claims, we propose that compassion is associated with activation in the parasympathetic autonomic nervous system through the vagus nerve. Across 4 studies, participants witnessed others suffer while we recorded physiological measures, including heart rate, respiration, skin conductance, and a measure of vagal activity called respiratory sinus arrhythmia (RSA). Participants exhibited greater RSA during the compassion induction compared with a neutral control (Study 1), another positive emotion (Study 2), and a prosocial emotion lacking appraisals of another person's suffering (Study 3). Greater RSA during the experience of compassion compared with the neutral or control emotion was often accompanied by lower heart rate and respiration but no difference in skin conductance. In Study 4, increases in RSA during compassion positively predicted an established composite of compassion-related words, continuous self-reports of compassion, and nonverbal displays of compassion. Compassion, a core affective component of empathy and prosociality, is associated with heightened parasympathetic activity. PMID:25621856

  2. Solar and Stellar Photospheric Abundances

    CERN Document Server

    Prieto, Carlos Allende

    2016-01-01

    The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations. Improving those foundations to refine the accuracy of the inferred abundances has proven challenging, but progress has been made. In parallel, developments on instrumentation, chiefly regarding multi-object spectroscopy, have been spectacular, and a number of projects are collecting large numbers of observations for stars across the Milky Way and nearby galaxies, promising important advances in our understanding of galaxy formation and evolution. After providing a brief description of the basic physics and input data involved in the analysis of stellar spectra, a review is made of the analysis steps, and the available tools to cope with large observational efforts. The paper closes with a quick overview of relevant ongoing and planned spectroscopic surveys, and highlights of recent research on photospheric abundances.

  3. Solar and stellar photospheric abundances

    Science.gov (United States)

    Allende Prieto, Carlos

    2016-07-01

    The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations. Improving those foundations to refine the accuracy of the inferred abundances has proven challenging, but progress has been made. In parallel, developments on instrumentation, chiefly regarding multi-object spectroscopy, have been spectacular, and a number of projects are collecting large numbers of observations for stars across the Milky Way and nearby galaxies, promising important advances in our understanding of galaxy formation and evolution. After providing a brief description of the basic physics and input data involved in the analysis of stellar spectra, a review is made of the analysis steps, and the available tools to cope with large observational efforts. The paper closes with a quick overview of relevant ongoing and planned spectroscopic surveys, and highlights of recent research on photospheric abundances.

  4. Gravitational Lensing & Stellar Dynamics

    CERN Document Server

    Koopmans, L V E

    2005-01-01

    Strong gravitational lensing and stellar dynamics provide two complementary and orthogonal constraints on the density profiles of galaxies. Based on spherically symmetric, scale-free, mass models, it is shown that the combination of both techniques is powerful in breaking the mass-sheet and mass-anisotropy degeneracies. Second, observational results are presented from the Lenses Structure & Dynamics (LSD) Survey and the Sloan Lens ACS (SLACS) Survey collaborations to illustrate this new methodology in constraining the dark and stellar density profiles, and mass structure, of early-type galaxies to redshifts of unity.

  5. PREFACE: A Stellar Journey A Stellar Journey

    Science.gov (United States)

    Asplund, M.

    2008-10-01

    The conference A Stellar Journey was held in Uppsala, Sweden, 23 27June 2008, in honour of Professor Bengt Gustafsson's 65th birthday. The choice of Uppsala as the location for this event was obvious given Bengt's long-standing association with the city stemming back to his school days. With the exception of a two-year postdoc stint in Copenhagen, five years as professor at Stockholm University and two years as director of the Sigtuna foundation, Bengt has forged his illustrious professional career at Uppsala University. The symposium venue was Museum Gustavianum, once the main building of the oldest university in Scandinavia. The title of the symposium is a paraphrasing of Bengt's popular astronomy book Kosmisk Resa (in English: Cosmic Journey) written in the early eighties. I think this aptly symbolizes his career that has been an astronomical voyage from near to far, from the distant past to the present. The original book title was modified slightly to reflect that most of his work to date has dealt with stars in one way or another. In addition it also gives credit to Bengt's important role as a guiding light for a very large number of students, colleagues and collaborators, indeed for several generations of astronomers. For me personally, the book Kosmisk Resa bears particular significance as it has shaped my life rather profoundly. Although I had already decided to become an astronomer, when I first read the book as a 14-year-old I made up my mind then and there that I would study under Bengt Gustafsson and work on stars. Indeed I have remained true to this somewhat audacious resolution. I suspect that a great number of us have similar stories how Bengt has had a major influence on our lives, whether on the professional or personal level. Perhaps Bengt's most outstanding characteristic is his enthralling enthusiasm. This is equally true whether he is pondering some scientific conundrum, supervising students or performing in front of an audience, be it an

  6. MODEST-1: Integrating Stellar Evolution and Stellar Dynamics

    OpenAIRE

    Hut, Piet; Shara, Michael M.; Aarseth, Sverre J.; Klessen, Ralf S.; Lombardi Jr, James C.; Makino, Junichiro; McMillan, Steve; Pols, Onno R.; Teuben, Peter J.; Webbink, Ronald F.

    2002-01-01

    We summarize the main results from MODEST-1, the first workshop on MOdeling DEnse STellar systems. Our goal is to go beyond traditional population synthesis models, by introducing dynamical interactions between single stars, binaries, and multiple systems. The challenge is to define and develop a software framework to enable us to combine in one simulation existing computer codes in stellar evolution, stellar dynamics, and stellar hydrodynamics. With this objective, the workshop brought toget...

  7. Progress Toward Attractive Stellarators

    Energy Technology Data Exchange (ETDEWEB)

    Neilson, G H; Brown, T G; Gates, D A; Lu, K P; Zarnstorff, M C; Boozer, A H; Harris, J H; Meneghini, O; Mynick, H E; Pomphrey, N; Reiman, A H

    2011-01-05

    The quasi-axisymmetric stellarator (QAS) concept offers a promising path to a more compact stellarator reactor, closer in linear dimensions to tokamak reactors than previous stellarator designs. Concept improvements are needed, however, to make it more maintainable and more compatible with high plant availability. Using the ARIES-CS design as a starting point, compact stellarator designs with improved maintenance characteristics have been developed. While the ARIES-CS features a through-the-port maintenance scheme, we have investigated configuration changes to enable a sector-maintenance approach, as envisioned for example in ARIES AT. Three approaches are reported. The first is to make tradeoffs within the QAS design space, giving greater emphasis to maintainability criteria. The second approach is to improve the optimization tools to more accurately and efficiently target the physics properties of importance. The third is to employ a hybrid coil topology, so that the plasma shaping functions of the main coils are shared more optimally, either with passive conductors made of high-temperature superconductor or with local compensation coils, allowing the main coils to become simpler. Optimization tools are being improved to test these approaches.

  8. Stellarator theory: Progress report

    International Nuclear Information System (INIS)

    This paper discusses progress in the following areas: The propagator method; ripple transport in tokamaks; self-consistent bounce-averaged numerical transport; computations: The bootstrap current; comparisons of stellarator ripple transport calculations; and plasma transport in IMS using a 1D fluid transport code

  9. Compact stellarator coils

    International Nuclear Information System (INIS)

    Experimental devices to study the physics of high-beta (β>∼4%), low aspect ratio (A<∼4.5) stellarator plasmas require coils that will produce plasmas satisfying a set of physics goals, provide experimental flexibility, and be practical to construct. In the course of designing a flexible coil set for the National Compact Stellarator Experiment, we have made several innovations that may be useful in future stellarator design efforts. These include: the use of Singular Value Decomposition methods for obtaining families of smooth current potentials on distant coil winding surfaces from which low current density solutions may be identified; the use of a Control Matrix Method for identifying which few of the many detailed elements of the stellarator boundary must be targeted if a coil set is to provide fields to control the essential physics of the plasma; the use of Genetic Algorithms for choosing an optimal set of discrete coils from a continuum of potential contours; the evaluation of alternate coil topologies for balancing the tradeoff between physics objective and engineering constraints; the development of a new coil optimization code for designing modular coils, and the identification of a 'natural' basis for describing current sheet distributions. (author)

  10. Progress Toward Attractive Stellarators

    International Nuclear Information System (INIS)

    The quasi-axisymmetric stellarator (QAS) concept offers a promising path to a more compact stellarator reactor, closer in linear dimensions to tokamak reactors than previous stellarator designs. Concept improvements are needed, however, to make it more maintainable and more compatible with high plant availability. Using the ARIES-CS design as a starting point, compact stellarator designs with improved maintenance characteristics have been developed. While the ARIES-CS features a through-the-port maintenance scheme, we have investigated configuration changes to enable a sector-maintenance approach, as envisioned for example in ARIES AT. Three approaches are reported. The first is to make tradeoffs within the QAS design space, giving greater emphasis to maintainability criteria. The second approach is to improve the optimization tools to more accurately and efficiently target the physics properties of importance. The third is to employ a hybrid coil topology, so that the plasma shaping functions of the main coils are shared more optimally, either with passive conductors made of high-temperature superconductor or with local compensation coils, allowing the main coils to become simpler. Optimization tools are being improved to test these approaches.

  11. Stellar Structure and Evolution

    CERN Document Server

    Kippenhahn, Rudolf; Weiss, Achim

    2013-01-01

    This long-awaited second edition of the classical textbook on Stellar Structure and Evolution by Kippenhahn and Weigert is a thoroughly revised version of the original text. Taking into account modern observational constraints as well as additional physical effects such as mass loss and diffusion, Achim Weiss and Rudolf Kippenhahn have succeeded in bringing the book up to the state-of-the-art with respect to both the presentation of stellar physics and the presentation and interpretation of current sophisticated stellar models. The well-received and proven pedagogical approach of the first edition has been retained. The book provides a comprehensive treatment of the physics of the stellar interior and the underlying fundamental processes and parameters. The models developed to explain the stability, dynamics and evolution of the stars are presented and great care is taken to detail the various stages in a star’s life. Just as the first edition, which remained a standard work for more than 20 years after its...

  12. 8. stellarator workshop

    International Nuclear Information System (INIS)

    The technical reports in this collection of papers were presented at the 8th International Workshop on Stellarators, and International Atomic Energy Agency Technical Committee Meeting. They include presentations on transport, magnetic configurations, fluctuations, equilibrium, stability, edge plasma and wall aspects, heating, diagnostics, new concepts and reactor studies. Refs, figs and tabs

  13. Trends of stellar entropy along stellar evolution

    International Nuclear Information System (INIS)

    This paper is devoted to discussing the difference in the thermodynamic entropy budget per baryon in each type of stellar object found in the Universe. We track and discuss the actual decrease of the stored baryonic thermodynamic entropy from the most primitive molecular cloud up to the final fate of matter in black holes, passing through evolved states of matter as found in white dwarfs and neutron stars. We then discuss the case of actual stars with different masses throughout their evolution, clarifying the role of the virial equilibrium condition for the decrease in entropy and related issues. Finally, we discuss the role of gravity in driving the composition and the structural changes of stars with different Main Sequence masses during their evolution up to the final product. Particularly, we discuss the entropy of a black hole in this context arguing that the dramatic increase in its entropy, differently from the other cases, is due to the gravitational field itself. (paper)

  14. Trends of stellar entropy along stellar evolution

    Science.gov (United States)

    de Avellar, Guilherme Bronzato, Marcio; Alvares de Souza, Rodrigo; Horvath, Jorge Ernesto

    2016-02-01

    This paper is devoted to discussing the difference in the thermodynamic entropy budget per baryon in each type of stellar object found in the Universe. We track and discuss the actual decrease of the stored baryonic thermodynamic entropy from the most primitive molecular cloud up to the final fate of matter in black holes, passing through evolved states of matter as found in white dwarfs and neutron stars. We then discuss the case of actual stars with different masses throughout their evolution, clarifying the role of the virial equilibrium condition for the decrease in entropy and related issues. Finally, we discuss the role of gravity in driving the composition and the structural changes of stars with different Main Sequence masses during their evolution up to the final product. Particularly, we discuss the entropy of a black hole in this context arguing that the dramatic increase in its entropy, differently from the other cases, is due to the gravitational field itself.

  15. Examining the predictive role of self-compassion on flourishing in Turkish university students

    Directory of Open Access Journals (Sweden)

    Akın Ahmet

    2015-10-01

    Full Text Available The purpose of this study is to examine the predictive role of self-compassion on flourishing Participants were 278 university students (153 women, 125 men. In this study, the Self-compassion Scale and the Flourishing Scale were used. The relationships between self-compassion and flourishing were examined using correlation and regression analysis. In correlation analysis, self-kindness, common humanity, and mindfulness factors of self-compassion were found positively and self-judgment, isolation, and over-identification factors of self-compassion were found negatively related to flourishing. According to regression results, flourishing was predicted negatively by self-judgment, isolation, and over-identification. Further self-kindness and mindfulness predicted flourishing in a positive way. Self-compassion has explained 47% of the variance in flourishing. Results were discussed in the light of related literature.

  16. Self-compassion and emotional invalidation mediate the effects of parental indifference on psychopathology.

    Science.gov (United States)

    Westphal, Maren; Leahy, Robert L; Pala, Andrea Norcini; Wupperman, Peggilee

    2016-08-30

    This study investigated whether self-compassion and emotional invalidation (perceiving others as indifferent to one's emotions) may explain the relationship of childhood exposure to adverse parenting and adult psychopathology in psychiatric outpatients (N=326). Path analysis was used to investigate associations between exposure to adverse parenting (abuse and indifference), self-compassion, emotional invalidation, and mental health when controlling for gender and age. Self-compassion was strongly inversely associated with emotional invalidation, suggesting that a schema that others will be unsympathetic or indifferent toward one's emotions may affect self-compassion and vice versa. Both self-compassion and emotional invalidation mediated the relationship between parental indifference and mental health outcomes. These preliminary findings suggest the potential utility of self-compassion and emotional schemas as transdiagnostic treatment targets. PMID:27288737

  17. Operations of a non-stellar object tracker in space

    DEFF Research Database (Denmark)

    Riis, Troels; Jørgensen, John Leif; Betto, Maurizio

    1999-01-01

    The ability to detect and track non-stellar objects by utilizing a star tracker may seem rather straight forward, as any bright object, not recognized as a star by the system is a non stellar object. However, several pitfalls and errors exist, if a reliable and robust detection is required. To test...... the operation, performance and robustness of such a function, the Autonomous Vision System (AVS), a fully autonomous star tracker that has flown onboard the Teamsat was equipped with several advanced features. These features included a non-stellar object detection and tracking module and an image and...

  18. Operations of a non-stellar object tracker in space

    OpenAIRE

    Riis, Troels; Jørgensen, John Leif; Betto, Maurizio

    1999-01-01

    The ability to detect and track non-stellar objects by utilizing a star tracker may seem rather straight forward, as any bright object, not recognized as a star by the system is a non stellar object. However, several pitfalls and errors exist, if a reliable and robust detection is required. To test the operation, performance and robustness of such a function, the Autonomous Vision System (AVS), a fully autonomous star tracker that has flown onboard the Teamsat was equipped with several advanc...

  19. Species of Compassion: Aesthetics, Anaesthetics, and Pain in the Physiological Laboratory

    OpenAIRE

    Rob Boddice

    2012-01-01

    This essay explores the interplay of different species of compassion with regard to physiological practices in the final decades of the nineteenth century. Drawing on the lexicon from which ideals of late-Victorian compassion were formed, it illustrates their contested nature, demonstrating how physiologists developed their own concepts of compassion based on the theories of Darwin and Spencer. Within this purview, the essay examines the historical specificity of antivivisectionist compassi...

  20. Påvirker mindfulness og self-compassion relasjonen mellom nevrotisisme og symptomtrykk?

    OpenAIRE

    Rummelhoff, Cecilie; Tingvold, Maiken

    2016-01-01

    Tidligere forskning indikerer at nevrotisisme er positivt korrelert med symptomtrykk, men at mindfulness og self-compassion er positivt korrelert med velvære og gode mestringsstrategier. I denne studien undersøkte vi hvordan nevrotisisme, mindfulness og self-compassion, kan relateres til symptombelastning. Vi forventet å se at self-compassion og mindfulness ville utgjøre en modererende eller medierende effekt på relasjonen mellom nevrotisisme og symptombelastning. Totalt 212 de...

  1. Stellar Pulsations and Stellar Evolution: Conflict, Cohabitation, or Symbiosis?

    Science.gov (United States)

    Weiss, Achim

    While the analysis of stellar pulsations allows the determination of current properties of a star, stellar evolution models connect it with its previous history. In many cases results from both methods do not agree. In this review some classical and current cases of disagreement are presented. In some cases these conflicts led to an improvement of the theory of stellar evolution, while in others they still remain unsolved. Some well-known problems of stellar physics are pointed out as well, for which it is hoped that seismology—or in general the analysis of stellar pulsations—will help to resolve them. The limits of this symbiosis will be discussed as well.

  2. Post-Disruptive Runaway Electron Beam in COMPASS Tokamak

    CERN Document Server

    Vlainic, Milos; Cavalier, Jordan; Weinzettl, Vladimir; Paprok, Richard; Imrisek, Martin; Ficker, Ondrej; Noterdaeme, Jean-Marie

    2015-01-01

    For ITER-relevant runaway electron studies, such as suppression, mitigation, termination and/or control of runaway beam, obtaining the runaway electrons after the disruption is important. In this paper we report on the first achieved discharges with post-disruptive runaway electron beam, entitled "runaway plateau", in the COMPASS tokamak. The runaway plateau is produced by massive gas injection of argon. Almost all of the disruptions with runaway electron plateaus occurred during the plasma current ramp-up phase. Comparison between the Ar injection discharges with and without plateau has been done for various parameters. Parametrisation of the discharges shows that COMPASS disruptions fulfill the range of parameters important for the runaway plateau occurrence. These parameters include electron density, electric field, disruption speed, effective safety factor, maximum current quench electric field. In addition to these typical parameters, the plasma current value just before the massive gas injection surpris...

  3. Fast photon detection for the COMPASS RICH detector

    CERN Document Server

    Abbon, P; Alekseev, M; Angerer, H; Apollonio, M; Birsa, R; Bordalo, P; Bradamante, Franco; Bressan, A; Busso, L; Chiosso, M; Ciliberti, P; Colantoni, M L; Costa, S; Dalla Torre, S; Dafni, T; Delagnes, E; Deschamps, H; Díaz, V; Dibiase, N; Duic, V; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Finger, M Jr; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; Von Harrach, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K C; Kolosov, V N; Konorov, I; Kramer, Daniel; Kunne, Fabienne; Lehmann, A; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nahle, O; Nerling, F; Neyret, D; Pagano, P; Panebianco, S; Panzieri, D; Paul, S; Pesaro, G; Polak, J; Rebourgeard, P; Robinet, F; Rocco, E; Schiavon, Paolo; Schroder, W; Silva, L; Slunecka, M; Sozzi, F; Steiger, L; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2007-01-01

    The COMPASS experiment at the SPS accelerator at CERN uses a large scale Ring Imaging CHerenkov detector (RICH) to identify pions, kaons and protons in a wide momentum range. For the data taking in 2006, the COMPASS RICH has been upgraded in the central photon detection area (25% of the surface) with a new technology to detect Cherenkov photons at very high count rates of several 10^6 per second and channel and a new dead-time free read-out system, which allows trigger rates up to 100 kHz. The Cherenkov photons are detected by an array of 576 visible and ultra-violet sensitive multi-anode photomultipliers with 16 channels each. The upgraded detector showed an excellent performance during the 2006 data taking.

  4. New pixelized Micromegas detector for the COMPASS experiment

    CERN Document Server

    Neyret, Damien; Bedfer, Yann; Burtin, Etienne; d'Hose, Nicole; Giganon, Arnaud; Ketzer, Bernhard; Konorov, Igor; Kunne, Fabienne; Magnon, Alain; Marchand, Claude; Paul, Bernard; Platchkov, Stéphane; Vandenbroucke, Maxence

    2009-01-01

    New Micromegas (Micro-mesh gaseous detectors) are being developed in view of the future physics projects planned by the COMPASS collaboration at CERN. Several major upgrades compared to present detectors are being studied: detectors standing five times higher luminosity with hadron beams, detection of beam particles (flux up to a few hundred of kHz/mm^2, 10 times larger than for the present detectors) with pixelized read-out in the central part, light and integrated electronics, and improved robustness. Studies were done with the present detectors moved in the beam, and two first pixelized prototypes are being tested with muon and hadron beams in real conditions at COMPASS. We present here this new project and report on two series of tests, with old detectors moved into the beam and with pixelized prototypes operated in real data taking condition with both muon and hadron beams.

  5. Cryogenic control system of the large COMPASS polarized target

    CERN Document Server

    Gautheron, F; Baum, G; Berglund, P; Doshita, N; Görtz, S; Gustafsson, K K; Horikawa, N; Kisselev, Yu V; Koivuniemi, J H; Kondo, K; Meyer, Werner T; Reicherz, G

    2004-01-01

    The dilution refrigerator used to cool the large COMPASS polarized target is monitored through a PC running LabVIEW trademark 6.1 under Windows 2000 trademark . About 60 parameters of the target (temperatures, pressures, flow rates) are continuously plotted and checked. They are periodically recorded in an Oracle trademark database and in a data file. An alarm for every parameter can be individually activated and optionally connected to a GSM (Global System for Mobile Communication) delivery message system. A web server receives and publishes the online status of the target with online tables and graphics on a dedicated COMPASS polarized target information web site. A Siemens programmable logic controller (PLC) powered by an uninterruptable source keeps the cryogenic system safe and stable during the long beam periods by controlling valves and interlocks. This safety feature protects the dilution refrigerator against potential damages in case of power failure.

  6. A multichannel interferometer for electron density measurements in COMPASS

    Science.gov (United States)

    Edlington, Trevor; Wylde, Richard

    1992-10-01

    A compact seven channel interferometer has been designed and built to measure electron density profiles in the COMPASS (compact assembly) tokamak. Two far-infrared (FIR) laser cavities are optically pumped with a single continuous-wave CO2 laser, generating two similar beams at λ=433 μm with a small, tunable difference frequency (0.5-1.0 MHz). The COMPASS facility incorporates a complex set of poloidal field coils close to the vacuum vessel as well as a versatile set of close coupled ``helical'' resonant magnetic perturbation windings which severely restrict diagnostic access. As a result a novel approach to the optical circuit has been necessary. Wire grid polarizers are used to divide the laser power equally between channels and to overlay probing and local oscillator beams after the probe beams have made a double pass through the plasma. Gaussian beam-mode optics is used to minimize the size of the optical components.

  7. Oncology nurse as wounded healer: developing a compassion identity.

    Science.gov (United States)

    Corso, Vincent M

    2012-10-01

    Oncology nurses caring for patients with complex medical, psychosocial, and spiritual issues-including patients at end of life-rely on current medical interventions to offer comfort to their patients. Equally important, but less acknowledged, is nurses' reliance on the internal processes of reflection and self-care. That internal focus is vital to the longevity of the nurse in a rewarding, but often depleting, arena. Compassion fatigue and burnout among oncology nurses are great risks to professional development and personal growth. Repeated exposure to physical and psychosocial pain and suffering can cause symptoms that resemble those of post-traumatic stress disorder. Awareness of one's own fragility and the need to understand the connections between body, mind, and spirit can assist the clinician in developing a compassion identity that nurses and other clinicians can use to insulate themselves from the stressors of their difficult and rewarding environment. PMID:23022927

  8. The Drell-Yan measurement at COMPASS-II

    CERN Document Server

    Takekawa, S

    2014-01-01

    The Drell-Yan process can be used to access Transverse Momentum Dependent Parton Distribu- tion Functions (TMD PDFs), such as the Sivers and the Boer-Mulders functions, as well as the transversity function providing complementary information to what is known from Semi Inclu- sive Deep Inelastic Scattering (SIDIS) data. The COMPASS experiment offers the possibility to study single polarized Drell-Yan processes making use of its large accep- tance spectrometer and its unique transversely polarised proton target. Moreover a fundamental test of the factorization theorem in the non-perturbative QCD can be performed, by verifying the sign change of the T-odd Boer-Mulders and Sivers functions depending if they are accessed via SIDIS or Drell-Yan process. As the start of the Drell-Yan program at COMPASS is approaching, foreseen in late 2014, the spectrometer has been updated to fulfill the needs of this measurement

  9. Online analysis during the 2016 COMPASS data taking

    CERN Document Server

    Tuybens, Benoit

    2016-01-01

    The COMPASS experiment is one of the few experiments in the world capable of studying the internal structure of protons with high precision. In 2016 the experiment will use the 160 GeV high energy positive and negative muon beams and a new liquid-hydrogen target. One of the main goals is the study of the virtual Compton scattering on the proton when a high energy muon scatters on a proton to produce a single photon. The analysis of the cross section and angular distributions will provide a 3 dimensional structure of the proton by determining the correlations between position and momentum of the elementary quarks and gluons inside the proton. The COMPASS experiment comprises a high resolution forward spectrometer with many trackers for charged particles, detectors for particle identification as three electromagnetic calorimeters and a recoil proton detector around the target.

  10. Post-Disruptive Runaway Electron Beam in COMPASS Tokamak

    OpenAIRE

    Vlainic, Milos; Mlynar, Jan; Cavalier, Jordan; Weinzettl, Vladimir; Paprok, Richard; Imrisek, Martin; Ficker, Ondrej; Noterdaeme, Jean-Marie; Team, the COMPASS

    2015-01-01

    For ITER-relevant runaway electron studies, such as suppression, mitigation, termination and/or control of runaway beam, obtaining the runaway electrons after the disruption is important. In this paper we report on the first achieved discharges with post-disruptive runaway electron beam, entitled "runaway plateau", in the COMPASS tokamak. The runaway plateau is produced by massive gas injection of argon. Almost all of the disruptions with runaway electron plateaus occurred during the plasma c...

  11. Validation of equilibrium tools on the COMPASS tokamak

    Czech Academy of Sciences Publication Activity Database

    Urban, Jakub; Appel, L.C.; Artaud, J.F.; Faugeras, B.; Havlíček, Josef; Komm, Michael; Lupelli, I.; Peterka, Matěj

    San Sebastián: JEMA Irizar Group, 2014. s. 314. [Twenty-Eighth Symposium on Fusion Technology (SOFT 2014). 29.09.2014-03.10.2014, San Sebastián] R&D Projects: GA ČR GP13-38121P Keywords : tokamak * equilibrium * COMPASS * reconstruction Subject RIV: BL - Plasma and Gas Discharge Physics http://www.soft2014.eu/img/posters.pdf

  12. COMPASSION SATISFACTION AND BURNOUT AMONGST CLINICIANS OF VADODARA CITY, GUJARAT

    Directory of Open Access Journals (Sweden)

    Anupsinh H

    2014-10-01

    Full Text Available INTRODUCTION: Clinicians are the one who are involved in most stressful events. Compassion fatigue comprises of two components-burnout and secondary traumatic stress. Up to one third of practicing clinicians could be expected to be suffering from burn out if assessed cross sectional. More importantly there has been an increasing trend in the emotional exhaustion of clinicians over the years. There is paucity of literature in this area, especially in the Indian setting. AIM: Identifying ‘burn out’ and ‘compassion fatigue’ among clinicians involved in care of individuals suffering from medical illness. MATERIAL AND METHODS: A total of 100 clinicians were included in the study. A semi structured questionnaire was administered to gather information related to personal & professional details of the study participants. Professional Quality of Life Scale (Pro QoL Version V was used to assess burnout, compassion satisfaction and secondary traumatic stress. Analysis was carried out using the SPSS. RESULTS: Females had higher compassion satisfaction (CS & less burn out (BO compared to males. Clinicians working with both teaching and non-teaching institute had higher CS compared to clinicians working only in private practice or associated with teaching institute. Clinicians from dental field had higher CS compared to clinicians from medical field. Clinicians from non-surgical field had higher CS compared to surgeons. Increase in the number of hours spent in clinical practice decreases CS & increases BO. CONCLUSION: Clinicians are the first contact for any patients & gets affected by their physical as well as mental trauma. Clinicians are exposed to great level of stress & traumatic events in their day to day activity & handle the burden of disease & deceased. Thus it is necessary to know the level of burden a clinician is carrying & find out the way to improve the life style & the patient care.

  13. COMPASSION SATISFACTION AND BURNOUT AMONGST CLINICIANS OF VADODARA CITY, GUJARAT

    OpenAIRE

    Anupsinh H; Sandip H.; Lakhan R; De, Kajal; Raghav; Nisarg

    2014-01-01

    INTRODUCTION: Clinicians are the one who are involved in most stressful events. Compassion fatigue comprises of two components-burnout and secondary traumatic stress. Up to one third of practicing clinicians could be expected to be suffering from burn out if assessed cross sectional. More importantly there has been an increasing trend in the emotional exhaustion of clinicians over the years. There is paucity of literature in this area, especially in the Indian setting. AIM...

  14. From Compassion Fatigue to Resilience: Children's Hospital Colorado

    OpenAIRE

    Johnson, Kelly; Griffin, Chris

    2014-01-01

    Background: Healthcare is a stressful profession. The executives at Children's Hospital Colorado are well aware of the affects that caring for sick children and the pressure associated with it have on our entire staff. Understanding what compassion fatigue looks like as well as the importance of stress management and its role in overall wellness for each of our employees led to the interest and support of HeartMath/Caritas workshops. Methods: HeartMath/Caritas training transformed into a prog...

  15. CORPORATE RESPONSIBILITY - A MORAL COMPASS OF THE CONSTRUCTION INDUSTRY

    OpenAIRE

    EVA JANKOVICHOVA

    2012-01-01

    The era of the economic recession created new epoch - the era ofresponsibility. It was never so important to demonstrate company's leading position,communicate its values and visions, restore the trust and reasonably manage resources,because responsible behavior usually leads to trust, loyalty and goodwill betweencustomers, business partners and other involved parties. Corporate socialresponsibility helps to create values and is a moral compass in business environment.It is not enough to prag...

  16. Numerical Investigations of Plasma Parameters in COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Havlíčková, E.; Zagórski, R.; Pánek, Radomír

    Praha: Institute of Plasma Physics AS CR,v.v.i, 2007 - (Brotánková, J.). s. 19-19 [Workshop on Electric Fields, Structures, and Relaxation in Plasmas/10th./. 8.7.2007-9.7.2007, Varšava] Institutional research plan: CEZ:AV0Z20430508 Keywords : Plasma modeling * COMPASS * detachement Subject RIV: BL - Plasma and Gas Discharge Physics

  17. Design and engineering of optical diagnostics for COMPASS

    Czech Academy of Sciences Publication Activity Database

    Šesták, David; Weinzettl, Vladimír; Bílková, Petra; Böhm, Petr; Aftanas, Milan; Naydenkova, Diana; Stöckel, Jan; Ďuran, Ivan; Walsh, M.J.

    2009-01-01

    Roč. 84, 7-11 (2009), s. 1755-1758. ISSN 0920-3796. [Symposium on Fusion Technology(SOFT-25) /25th./. Rostock, 15.09.2008-19.09.2008] R&D Projects: GA ČR GD202/08/H057 Institutional research plan: CEZ:AV0Z20430508 Keywords : COMPASS * tokamak * optical diagnostic * Thomson scattering Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 1.122, year: 2009

  18. The Primakoff reaction study for pion polarizability measurement at COMPASS

    International Nuclear Information System (INIS)

    The electromagnetic structure of charged pions can be described by the electric (απ) and magnetic (βπ) polarizabilities that depend on the rigidity of pion internal structure as a composite particle. It is shown that the values of απ and βπ can be precisely measured via the Primakoff reaction π- + (A,Z) → π- + (A,Z) + γ in the COMPASS experiment at CERN

  19. Design of selected subsystems for COMPASS tokamak operation

    Czech Academy of Sciences Publication Activity Database

    Janky, Filip; Pereira, T.; Hron, Martin; Pánek, Radomír; Fernandes, H.

    Aix-en-Provence : IAEA, 2009. s. 80-80. ISBN N. [Seventh IAEATechnical Meeting on Control, Data Acquisition, and Remote Participation for Fusion Research. 15.06.2009-19.06.2009, Aix-en-Provence] Institutional research plan: CEZ:AV0Z20430508 Keywords : tokamak * Compass * machine control * tokamak operation Subject RIV: BL - Plasma and Gas Discharge Physics http://www-fusion-magnetique.cea.fr/tmiaea2009/ website /data/articles/000080.pdf

  20. Optimization of magnetic perturbation spectra for the COMPASS tokamak

    Czech Academy of Sciences Publication Activity Database

    Cahyna, Pavel

    Geneva : International Atomic Energy Agency, 2008. s. 247-247. ISBN N. [IAEA Fusion Energy Conference/22nd./. 13.10.2008-18.10.2008, Geneva] Institutional research plan: CEZ:AV0Z20430508 Keywords : resonant magnetic perturbations * ELM control * magnetic islands * saddle coils * COMPASS tokamak Subject RIV: BL - Plasma and Gas Discharge Physics http://www-pub.iaea.org/MTCD/Meetings/PDFplus/2008/cn165/cn165_BookOfAbstracts.pdf

  1. RELATIONSHIPS AMONGST SELF-COMPASSION, SELF-ESTEEM AND SCHIZOTYPY

    OpenAIRE

    Marshall, Nicola

    2014-01-01

    Aims and Objectives The primary aim of the research was to investigate the nature of the relationships between self-compassion, self-esteem and schizotypy using a non-clinical sample. A secondary aim was to investigate the mechanisms which help to explain any relationships found. In utilising a non-clinical sample the study aimed to determine whether relationships exist between the variables prior to the onset of psychosis within a continuum approach to schizotypy. A final objective was to...

  2. A fast Tracker for COMPASS based on the GEM

    International Nuclear Information System (INIS)

    The small area tracking system of COMPASS, a new high-luminosity fixed target experiment at CERN's SPS accelerator, comprises 20 large-size triple GEM (Gas Electron Multiplier) detectors. It was completed and fully operational for the first time for the 2002 muon run. We report on the performance of these chambers in the high-intensity beam and give first results on efficiencies as well as spatial and time resolutions measured for the full set of detectors under various beam conditions

  3. Validation of equilibrium tools on the COMPASS tokamak

    Czech Academy of Sciences Publication Activity Database

    Urban, Jakub; Appel, L.C.; Artaud, J.; Faugeras, B.; Havlíček, Josef; Komm, Michael; Lupelli, I.; Peterka, Matěj

    96-97, October (2015), s. 998-1001. ISSN 0920-3796. [Symposium on Fusion Technology 2014(SOFT-28)/28./. San Sebastián, 29.09.2014-03.10.2014] R&D Projects: GA ČR GP13-38121P Institutional support: RVO:61389021 Keywords : Tokamak * Equilibrium * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 1.152, year: 2014

  4. Compassion fatigue: a review of the research to date and relevance to cancer-care providers.

    Science.gov (United States)

    Najjar, Nadine; Davis, Louanne W; Beck-Coon, Kathleen; Carney Doebbeling, Caroline

    2009-03-01

    Fifty-seven studies were reviewed to identify the prevalence of compassion fatigue among cancer-care providers, instruments used to detect it and means of prevention and treatment. Conclusions were limited by an ambiguous definition of compassion fatigue that fails to adequately differentiate it from related constructs (e.g. burnout, secondary traumatic stress) and the modest number of cancer-related studies found. However, evidence suggests that compassion fatigue takes a toll not only on cancer-care providers but also on the workplace. These findings highlight the need to understand more clearly the link between the empathic sensitivity of healthcare professionals and their vulnerability to compassion fatigue. PMID:19237494

  5. Smiling through clenched teeth: why compassion cannot be written into the rules.

    Science.gov (United States)

    Wang, Yinchu

    2016-01-01

    The discourse on the failings of the National Health System often cites lack of compassion as an important factor. This has resulted in proposals to enact rules which aimed at enforcing compassion in healthcare workers so as to improve the quality of healthcare and avoid future scandals. This paper argues that compassion cannot be enforced by any rule. Moreover, the contractual nature of the current doctor-patient relationship does not foster it. Experience from other service industries shows that attempts to enforce compassion in workers are futile. Rather than improving service, these attempts result in a culture of perfunctoriness and cynicism. PMID:26530704

  6. Stellar coronas, X-rays, and Einstein

    International Nuclear Information System (INIS)

    Observations of the sun at ultraviolet and X-ray wavelengths reveal a structure connected with the configuration of the solar magnetic field. The Einstein Observatory (HEAO 2), the first satellite to use an imaging X-ray telescope, searched for faint coronas on the basis of visual brightness and their proximity to the sun. Observed temperatures of transition regions between the chromosphere and the corona exceed 1,000,000 K. A possible correlation between X-ray luminosity and rotation rate has been observed and Einstein observations also indicated that stellar coronas showed changes in X-ray brightness during the most stable period of a star's life. Solar flares and transients, which generate substantial amounts of X-rays, radio waves and charged particles, are believed to be other properties of stellar coronas which change with age. Future missions such as NASA's Extreme Ultraviolet Explorer, the Advanced X-ray Astrophysics Facility and Space Telescope will enable astronomers to greatly increase their sampling of stellar coronas available for study. Observations also suggest the early development of a strong stellar dynamo due to X-ray activity in pre-main-sequence objects. It is hoped that the study of activity cycles in other stars will yield a greater understanding of the dynamo theory

  7. Upgrade of the COMPASS tokamak real-time control system

    Energy Technology Data Exchange (ETDEWEB)

    Janky, F., E-mail: filip.janky.work@gmail.com [Institute of Plasma Physics, AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 18200 Prague (Czech Republic); Charles University in Prague, Faculty of Mathematics and Physics, V Holesovickach 2, 18000 Prague (Czech Republic); Havlicek, J. [Institute of Plasma Physics, AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 18200 Prague (Czech Republic); Charles University in Prague, Faculty of Mathematics and Physics, V Holesovickach 2, 18000 Prague (Czech Republic); Batista, A.J.N. [Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa (Portugal); Kudlacek, O.; Seidl, J. [Institute of Plasma Physics, AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 18200 Prague (Czech Republic); Neto, A.C. [Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa (Portugal); Pipek, J.; Hron, M. [Institute of Plasma Physics, AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 18200 Prague (Czech Republic); Mikulin, O. [Institute of Plasma Physics, AS CR, v.v.i., Association EURATOM/IPP.CR, Za Slovankou 3, 18200 Prague (Czech Republic); Czech Technical University, Faculty of Nuclear Sciences and Physical Engineering, V Holesovickach 2, 18000 Prague (Czech Republic); and others

    2014-03-15

    Highlights: • An upgrade of the COMPASS real-time system has been made to generally improve the plasma performance. • Stability of discharges in SNT configuration has been increased. • Plasma flat-top phase length has been extended. • Central solenoid protection has been developed. • Plasma position estimation has been improved. - Abstract: The COMPASS plasma control system is based on the MARTe real-time framework. Thanks to MARTe modularity and flexibility new algorithms have been developed for plasma diagnostic (plasma position calculation), control (shaping field control), and protection systems (central solenoid protection). Moreover, the MARTe framework itself was modified to broaden the communication capabilities via Aurora. This paper presents the recent upgrades and improvements made to the COMPASS real-time plasma control system, focusing on the issues related to precision of the real-time calculations, and discussing the improvements in terms of discharge parameters and stability. In particular, the new real-time system has given the possibility to analyze and to minimize the transport delays of each control loop.

  8. Upgrade of the COMPASS tokamak real-time control system

    International Nuclear Information System (INIS)

    Highlights: • An upgrade of the COMPASS real-time system has been made to generally improve the plasma performance. • Stability of discharges in SNT configuration has been increased. • Plasma flat-top phase length has been extended. • Central solenoid protection has been developed. • Plasma position estimation has been improved. - Abstract: The COMPASS plasma control system is based on the MARTe real-time framework. Thanks to MARTe modularity and flexibility new algorithms have been developed for plasma diagnostic (plasma position calculation), control (shaping field control), and protection systems (central solenoid protection). Moreover, the MARTe framework itself was modified to broaden the communication capabilities via Aurora. This paper presents the recent upgrades and improvements made to the COMPASS real-time plasma control system, focusing on the issues related to precision of the real-time calculations, and discussing the improvements in terms of discharge parameters and stability. In particular, the new real-time system has given the possibility to analyze and to minimize the transport delays of each control loop

  9. Exploring compassion: implications for contemporary nursing. Part 2.

    Science.gov (United States)

    Straughair, Collette

    A range of contemporary political and professional literature endorse the principle of compassion in nursing as a core and underpinning philosophy fundamental to the profession. However, despite pledges to ensure that compassion lies at the heart of nursing, the concept has not been clearly defined. It is evident that uncovering the true meaning is complex and challenging owing to its subjective nature. In light of this, several implications must be considered. Effective student nurse recruitment is essential to ensure that the most appropriate individuals are selected. Contemporary marketing campaigns must be implemented, and recruitment strategies developed, which consider specific values and attitudes. Service user involvement in recruitment and selection, curriculum planning and learning and teaching strategies, and post-qualification education, can enhance nurses' understanding of the patient perspective and make headway in embedding compassion as a core nursing value. Additionally, effective role modelling in practice which demonstrates high-quality compassionate nursing care is essential. Nurses must be adequately supported in the clinical environment to facilitate compassionate behaviours and clinical leadership at all levels must uphold political and professional pledges to achieve this. Consideration of these implications for practice is essential to ensure that nurses are able to respond to patients with humanity and kindness, and deliver high-quality, compassionate care to all. PMID:22398938

  10. Polarised Drell-Yan measurements at COMPASS-II

    Science.gov (United States)

    Quaresma, M.

    2014-01-01

    The spin structure of the nucleon and its Parton Distribution Functions (PDFs) are important topics studied by the COMPASS experiment at CERN. So far, the transverse momentum dependent PDFs (TMD PDFs) of the proton and deuteron have been studied in Semi-Inclusive Deep Inelastic Scattering (SIDIS). The Drell-Yan (DY) process is a complementary way to access the TMD PDFs, using a transversely polarised target. Studying the angular distributions of dimuons from the DY events produced in the collisions of a π- beam with 190 GeV/ c momentum off a transversely polarised proton target (NH3) we are able to extract the azimuthal spin asymmetries, which are generated by 4 out of the 8 TMD PDFs needed to describe the nucleon structure at leading order QCD. The expected sign change in Sivers and Boer-Mulders functions when accessed from DY and SIDIS will be checked [1]. The opportunity to study, in the same experiment, the TMD PDFs from both SIDIS and DY processes is unique at COMPASS. The COMPASS II Proposal [2] was approved by CERN including one year for polarised DY measurements; the beginning of the DY data taking is scheduled for 2014. The feasibility of the measurement was proven by several beam tests performed so far.

  11. The quantum needle of the avian magnetic compass.

    Science.gov (United States)

    Hiscock, Hamish G; Worster, Susannah; Kattnig, Daniel R; Steers, Charlotte; Jin, Ye; Manolopoulos, David E; Mouritsen, Henrik; Hore, P J

    2016-04-26

    Migratory birds have a light-dependent magnetic compass, the mechanism of which is thought to involve radical pairs formed photochemically in cryptochrome proteins in the retina. Theoretical descriptions of this compass have thus far been unable to account for the high precision with which birds are able to detect the direction of the Earth's magnetic field. Here we use coherent spin dynamics simulations to explore the behavior of realistic models of cryptochrome-based radical pairs. We show that when the spin coherence persists for longer than a few microseconds, the output of the sensor contains a sharp feature, referred to as a spike. The spike arises from avoided crossings of the quantum mechanical spin energy-levels of radicals formed in cryptochromes. Such a feature could deliver a heading precision sufficient to explain the navigational behavior of migratory birds in the wild. Our results (i) afford new insights into radical pair magnetoreception, (ii) suggest ways in which the performance of the compass could have been optimized by evolution, (iii) may provide the beginnings of an explanation for the magnetic disorientation of migratory birds exposed to anthropogenic electromagnetic noise, and (iv) suggest that radical pair magnetoreception may be more of a quantum biology phenomenon than previously realized. PMID:27044102

  12. Are migrating raptors guided by a geomagnetic compass?

    Science.gov (United States)

    Thorup, Kasper; Fuller, Mark R.; Alerstam, T.; Hake, M.; Kjellen, N.; Standberg, R.

    2006-01-01

    We tested whether routes of raptors migrating over areas with homogeneous topography follow constant geomagnetic courses more or less closely than constant geographical courses. We analysed the routes taken over land of 45 individual raptors tracked by satellite-based radiotelemetry: 25 peregrine falcons, Falco peregrinus, on autumn migration between North and South America, and seven honey buzzards, Pernis apivorus, and 13 ospreys, Pandion haliaetus, on autumn migration between Europe and Africa. Overall, migration directions showed a better agreement with constant geographical than constant geomagnetic courses. Tracks deviated significantly from constant geomagnetic courses, but were not significantly different from geographical courses. After we removed movements directed far from the mean direction, which may not be migratory movements, migration directions still showed a better agreement with constant geographical than constant geomagnetic courses, but the directions of honey buzzards and ospreys were not significantly different from constant geomagnetic courses either. That migration routes of raptors followed by satellite telemetry are in closer accordance with constant geographical compass courses than with constant geomagnetic compass courses may indicate that geographical (e.g. based on celestial cues) rather than magnetic compass mechanisms are of dominating importance for the birds' long-distance orientation.

  13. The local stellar population

    International Nuclear Information System (INIS)

    We describe an undergraduate experiment that can be used to place the Sun in context with the properties of our nearest stellar neighbours. Using stars selected on the basis of their trigonometric parallaxes and spreadsheet software, the Hertzsprung-Russell diagram and luminosity function are constructed for stars within 16 pc, showing that the Sun is at least 25 times more luminous and 2.5 times more massive than a median field star. The experiment serves as an excellent means of practising transferable skills and introduces the concepts of selection effects and systematic bias in astronomical measurements. The sample of nearby stars is demonstrably incomplete. The missing stars tend to be intrinsically faint, leading to an overestimate of the median stellar luminosity

  14. Feeding quasars with stellar winds

    International Nuclear Information System (INIS)

    Quasars may be fueled by stellar mass loss from OB stars and red giants: either normal winds and mass loss or X-ray induced stellar winds in luminous quasars with well developed cusps in the stellar density distribution. The X-ray induced mass loss may furnish part of the broad emission-line gas, as well as an accretion supply for a central black hole during transient bursts of quasar luminosity. The importance of a stellar density cusp may couple stellar dynamical processes with gas-radiative processes in the quasar nucleus, accounting for quasar variability. The coupling of X-ray luminosity with mass supply and stellar population may imply evolution of optical-to-X-ray luminosity ratios with redshift. Most importantly, the evolution of the stellar population away from the initial mass function may explain the scarcity of quasars at low redshift

  15. Stellar populations in star clusters

    CERN Document Server

    Li, Chengyuan; Deng, Licai

    2016-01-01

    Stellar populations contain the most important information about star clus- ter formation and evolution. Until several decades ago, star clusters were believed to be ideal laboratories for studies of simple stellar populations (SSPs). However, discoveries of multiple stellar populations in Galactic globular clusters have expanded our view on stellar populations in star clusters. They have simultaneously generated a number of controversies, particularly as to whether young star clusters may have the same origin as old globular clusters. In addition, extensive studies have revealed that the SSP scenario does not seem to hold for some intermediate-age and young star clusters either, thus making the origin of multiple stellar populations in star clusters even more complicated. Stellar population anomalies in numerous star clusters are well-documented, implying that the notion of star clusters as true SSPs faces serious challenges. In this review, we focus on stellar populations in massive clusters with different ...

  16. Galactic Stellar Populations

    CERN Document Server

    Wyse, R F G; Wyse, Rosemary F.G.; Gilmore, Gerard

    2005-01-01

    The history of the formation and evolution of the Milky Way Galaxy is found in the spatial distribution, kinematics, age and chemical abundance distributions of long-lived stars. From this fossil record one can in principle extract the star formation histories of different components, their chemical evolution, the stellar Initial Mass Function, the merging history -- what merged and when did it merge? -- and compare with theoretical models. Observations are driving models, and we live in exciting times.

  17. Galactic Stellar Populations

    OpenAIRE

    Wyse, Rosemary F. G.; Gilmore, Gerard

    2005-01-01

    The history of the formation and evolution of the Milky Way Galaxy is found in the spatial distribution, kinematics, age and chemical abundance distributions of long-lived stars. From this fossil record one can in principle extract the star formation histories of different components, their chemical evolution, the stellar Initial Mass Function, the merging history -- what merged and when did it merge? -- and compare with theoretical models. Observations are driving models, and we live in exci...

  18. Oscillations in stellar superflares

    CERN Document Server

    Balona, L A; Kosovichev, A; Nakariakov, V M; Pugh, C E; Van Doorsselaere, T

    2015-01-01

    Two different mechanisms may act to induce quasi-periodic pulsations (QPP) in whole-disk observations of stellar flares. One mechanism may be magneto-hydromagnetic (MHD) forces and other processes acting on flare loops as seen in the Sun. The other mechanism may be forced local acoustic oscillations due to the high-energy particle impulse generated by the flare (known as `sunquakes' in the Sun). We analyze short-cadence Kepler data of 257 flares in 75 stars to search for QPP in the flare decay branch or post-flare oscillations which may be attributed to either of these two mechanisms. About 18 percent of stellar flares show a distinct bump in the flare decay branch of unknown origin. The bump does not seem to be a highly-damped global oscillation because the periods of the bumps derived from wavelet analysis do not correlate with any stellar parameter. We detected damped oscillations covering several cycles (QPP), in seven flares on five stars. The periods of these oscillations also do not correlate with any ...

  19. Primordial Stellar Populations

    CERN Document Server

    Panagia, N

    2002-01-01

    We review the expected properties of the first stellar generations in the Universe. In particular, we consider and discuss the diagnostics, based on the emission from associated HII regions, that permit one to discern bona fide primeval stellar generations from the ones formed after pollution by supernova explosions has occurred. We argue that a proper characterization of truly primeval stellar generations has to be based on spectra that show simultaneously (a) the presence of high intensities and equivalent widths of Hydrogen and Helium emission lines, such as Ly-alpha and HeII 1640A, and (b) the absence of collisionally excited metal lines, mostly from the first heavy elements to be synthetized in large quantities, i.e. C and O. These atomic species are expected to produce emission lines, such as CIII] 1909A, OIII] 1666A, [OIII] 5007A, etc., with intensities above 10% the intensity of H-beta already for metallicities as low as 0.001Z_sun. The expected performance of the NASA/ESA/CSA NGST for the study and t...

  20. Contribution of Self-Compassion to Competence and Mental Health in Social Work Students

    Science.gov (United States)

    Ying, Yu-Wen

    2009-01-01

    This study examined the potential contribution of self-compassion to perceived competence and mental health in master's of social work students (N=65). It was hypothesized that the components of self-compassion (i.e., mindfulness, common humanity, self-kindness, overidentification, isolation, and self-judgment) would impact perceived competence…

  1. Mindfulness-Based Awareness and Compassion: Predictors of Counselor Empathy and Anxiety

    Science.gov (United States)

    Fulton, Cheryl L.; Cashwell, Craig S.

    2015-01-01

    Mindfulness-based awareness and compassion were examined as predictors of empathy and anxiety among 152 master's-level counseling interns. Results of hierarchical multiple regression analysis supported that awareness and compassion differentially contributed to explaining the variance in counselor empathy and anxiety. Implications for counselor…

  2. Self-compassion versus global self-esteem: Two different ways of relating to the self

    NARCIS (Netherlands)

    Neff, K.D.; Vonk, R.

    2008-01-01

    This research examined self-compassion and self-esteem as they relate to various aspects of psychological functioning. Self-compassion entails treating oneself with kindness, recognizing one's shared humanity, and being mindful when considering negative aspects of oneself. Study 1 (N=2,187) compared

  3. Iron-mineral-based magnetoreceptor in birds: polarity or inclination compass?

    DEFF Research Database (Denmark)

    Solov'yov, Ilia; Greiner, Walter

    2009-01-01

    In the present paper we demonstrate that the iron-mineral-based magnetoreceptor model can provide birds with a magnetic compass in addition to the generally believed "magnetic map". We show that the iron-mineral-based magnetoreceptor system possesses all properties of a polarity compass, which is...

  4. Self-Compassion as a Mediator of Maladaptive Perfectionism and Depressive Symptoms in College Students

    Science.gov (United States)

    Mehr, Kristin E.; Adams, Aimee C.

    2016-01-01

    The purpose of the study was to examine the relationships among maladaptive perfectionism, self-compassion, and depressive symptoms in college students. It was hypothesized that self-compassion would mediate the relationship between maladaptive perfectionism and depressive symptoms, with maladaptive perfectionism related to lower levels of…

  5. The Influence of Self-Compassion on Academic Procrastination and Dysfunctional Attitudes

    Science.gov (United States)

    Iskender, Murat

    2011-01-01

    In the present study, aims were (1) to determine gender differences in self-compassion, academic procrastination, and dysfunctional attitudes and (2) to examine the relationships between self-compassion, academic procrastination, and dysfunctional attitudes. Participants were 251 university students who completed a questionnaire package that…

  6. Design of the national compact stellarator experiment (NCSX)

    Energy Technology Data Exchange (ETDEWEB)

    Nelson, B.E. E-mail: nelsonbe@ornl.gov; Berry, L.A.; Brooks, A.B.; Cole, M.J.; Chrzanowski, J.C.; Fan, H.-M.; Fogarty, P.J.; Goranson, P.L.; Heitzenroeder, P.J.; Hirshman, S.P.; Jones, G.H.; Lyon, J.F.; Neilson, G.H.; Reiersen, W.T.; Strickler, D.J.; Williamson, D.E

    2003-09-01

    The National Compact Stellarator Experiment (NCSX) [http://www.pppl.gov/ncsx/Meetings/CDR/CDRFinal/EngineeringOverview{sub R}2.pdf] is being designed as a proof of principal test of a quasi-axisymmetric compact stellarator. This concept combines the high beta and good confinement features of an advanced tokamak with the low current, disruption-free characteristics of a stellarator. NCSX has a three-field-period plasma configuration with an average major radius of 1.4 m, an average minor radius of 0.33 m and a toroidal magnetic field on axis of up to 2 T. The stellarator core is a complex assembly of four coil systems that surround the highly shaped plasma and vacuum vessel. Heating is provided by up to four, 1.5 MW neutral beam injectors and provision is made to add 6 MW of ICRH. The experiment will be built at the Princeton Plasma Physics Laboratory, with first plasma expected in 2007.

  7. A Community of Scientists and Educators: The Compass Project at UC Berkeley

    Science.gov (United States)

    Roth, Nathaniel; Schwab, Josiah

    2016-01-01

    The Berkeley Compass Project is a self-formed group of graduate and undergraduate students in the physical sciences at the University of California, Berkeley. Its goals are to improve undergraduate physics education, provide opportunities for professional development, and increase retention of students from populations underrepresented in the physical sciences. For undergraduate students, the core Compass experience consists of a summer program and several seminar courses. These programs are designed to foster a diverse, collaborative student community in which students engage in authentic research practices and regular self-reflection. Graduate students, together with upper-level undergraduates, design and run all Compass programs. Compass strives to incorporate best practices from the science education literature. Experiences in Compass leave participants poised to be successful students researchers, teachers, and mentors.

  8. Self-compassion and reactions to serious illness: The case of HIV

    Science.gov (United States)

    Brion, John M; Leary, Mark R; Drabkin, Anya S

    2015-01-01

    To test the hypothesis that self-compassion buffers people against the emotional impact of illness and is associated with medical adherence, 187 HIV-infected individuals completed a measure of self-compassion and answered questions about their emotional and behavioral reactions to living with HIV. Self-compassion was related to better adjustment, including lower stress, anxiety, and shame. Participants higher in self-compassion were more likely to disclose their HIV status to others and indicated that shame had less of an effect on their willingness to practice safe sex and seek medical care. In general, self-compassion was associated with notably more adaptive reactions to having HIV. PMID:23300046

  9. Self-compassion, body image, and disordered eating: A review of the literature.

    Science.gov (United States)

    Braun, Tosca D; Park, Crystal L; Gorin, Amy

    2016-06-01

    Self-compassion, treating oneself as a loved friend might, demonstrates beneficial associations with body image and eating behaviors. In this systematic review, 28 studies supporting the role of self-compassion as a protective factor against poor body image and eating pathology are reviewed. Findings across various study designs consistently linked self-compassion to lower levels of eating pathology, and self-compassion was implicated as a protective factor against poor body image and eating pathology, with a few exceptions. These findings offer preliminary support that self-compassion may protect against eating pathology by: (a) decreasing eating disorder-related outcomes directly; (b) preventing initial occurrence of a risk factor of a maladaptive outcome; (c) interacting with risk factors to interrupt their deleterious effects; and (d) disrupting the mediational chain through which risk factors operate. We conclude with suggestions for future research that may inform intervention development, including the utilization of research designs that better afford causal inference. PMID:27038782

  10. Physics of Stellar Convection

    Science.gov (United States)

    Arnett, W. David

    2009-05-01

    We review recent progress using numerical simulations as a testbed for development of a theory of stellar convection, much as envisaged by John von Newmann. Necessary features of the theory, non-locality and fluctuations, are illustrated by computer movies. It is found that the common approximation of convection as a diffusive process presents the wrong physical picture, and improvements are suggested. New observational results discussed at the conference are gratifying in their validation of some of our theoretical ideas, especially the idea that SNIb and SNIc events are related to the explosion of massive star cores which have been stripped by mass loss and binary interactions [1

  11. Power supplies for plasma column control in the COMPASS tokamak

    Energy Technology Data Exchange (ETDEWEB)

    Havlicek, J. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8 (Czech Republic); Hauptmann, R. [ČKD Elektrotechnika, Kolbenova 936/5e, 190 00 Praha 9 (Czech Republic); Peroutka, O.; Tadros, M. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Hron, M., E-mail: hron@ipp.cas.cz [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Janky, F.; Vondracek, P. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Praha 8 (Czech Republic); Cahyna, P. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Mikulín, O. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic); Department of Physical Electronics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 180 00 Praha 8 (Czech Republic); Šesták, D.; Junek, P.; Pánek, R. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Za Slovankou 3, 182 00 Praha 8 (Czech Republic)

    2013-10-15

    Highlights: ► Design of power supplies for fast control of plasma position in COMPASS tokamak. ► Design of power supply for experiments with ELM control by vertical plasma movement. ► Common regulator for power supplies for vertical plasma position and for ELMs control. ► Current status of construction, commissioning, and operation of these power supplies. -- Abstract: The main magnetic fields in COMPASS – i.e. The Toroidal, Magnetising, Equilibrium, and Shaping Fields – are created by a set of four corresponding thyristor power supplies controlled in a 0.5 ms loop. The plasma position has to be controlled both radially and vertically by two additional magnetic fields provided by two fast amplifiers (FAs) based on MOSFET technology, each supplying ±100 V and up to ±5 kA. Currently, an ongoing project aims at ELM triggering by fast changes of the vertical position of the plasma column, also referred to as vertical kicks. For this purpose, a new Vertical Kicks Power Supply (VKPS) capable of quick change of vertical plasma position is being constructed. This power supply should operate at up to 1.2 kV with switching frequency up to 5 kHz. It is designed as a H-bridge but based on IGBT transistors which can be operated at higher voltages than MOSFETs. In this paper, we focus on the FAs and VKPS engineering design and required output parameters. Both the power supplies are based on modern components with highest available ratings in their categories. Unique design of the power supplies takes advantage of the short duration of the COMPASS discharge by overloading the transistors above their maximal steady-state rating. The FA is regularly operating, so that in addition to describing its design, we also describe the achieved performance parameters. Finally, the common controller unit, communication, and error handling is described.

  12. Progress of development of Thomson scattering diagnostic system on COMPASS

    International Nuclear Information System (INIS)

    A new Thomson scattering diagnostic system has been designed and is being built now on the COMPASS tokamak at the Institute of Plasma Physics ASCR in Prague (IPP Prague) in the Czech Republic. This contribution focuses on design, development, and installation of the light collection and detection system. High spatial resolution of 3 mm will be achieved by a combination of design of collection optics and connected polychromators. Imaging characteristics of both core and edge plasma collection objectives are described and fiber backplane design is presented. Several calibration procedures are discussed. The operational deployment of the Thomson scattering diagnostic is planned by the end of 2010.

  13. New High Resolution Thomson Scattering system for the COMPASS tokamak

    Czech Academy of Sciences Publication Activity Database

    Brotánková, Jana; Bělský, Petr; Weinzettl, Vladimír; Böhm, Petr

    Vol. 2. Prague : MATFYZPRESS, Prague, 2007 - (Šafránková, J.; Pavlů, J.), s. 218-223 ISBN 978-80-7378-024-1. [Annual Conference of Doctoral Students - WDS 2007 /16./. Prague (CZ), 05.06.2007-08.06.2007] R&D Projects: GA ČR GD202/03/H162 Institutional research plan: CEZ:AV0Z20430508 Keywords : Thomson Scattering * tokamak * diagnostics * laser * electron temperature * electron density * COMPASS tokamak Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/contents/wds07.htm#ppm

  14. Plasma Boundary Reconstruction using Fast Camera on the COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Háček, Pavel; Berta, Miklós; Stöckel, Jan; Weinzettl, Vladimír; Budai, C.; Szabolics, T.; Bencze, A.

    Prague: MATFYZPRESS, 2014 - (Šafránková, J.; Pavlů, J.), s. 221-226. (WDS). ISBN 978-80-7378-276-4. [Annual Conference of Doctoral Students – WDS 2014 /23./. Prague (CZ), 03.06.2014-05.06.2014] R&D Projects: GA MŠk(CZ) LM2011021 Institutional support: RVO:61389021 Keywords : plasma * tokamak * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/proc/pdf14/WDS14_39_f2_Hacek.pdf

  15. Real-Time Software for the Compass Tokamak Plasma Control

    Energy Technology Data Exchange (ETDEWEB)

    Valcarcel, D.F.; Duarte, A.S.; Neto, A.; Carvalho, I.S.; Carvalho, B.B.; Fernandes, H.; Sousa, J. [Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Lisboa (Portugal); Sartori, F. [Euratom-UKAEA, Culham Science Centre, Abingdon, OX14 3DB Oxon (United Kingdom); Janky, F.; Cahyna, P.; Hron, M.; Panek, R. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM / IPP.CR, Prague (Costa Rica)

    2009-07-01

    This poster presents the flexible and high-performance real time system that guarantees the desired time cycles for plasma control on the COMPASS tokamak: 500 {mu}s for toroidal field, current, equilibrium and shaping; 50 {mu}s for fast control of the equilibrium and vertical instability. This system was developed on top of a high-performance processor and a software framework (MARTe) tailored for real-time. The preliminary measurements indicate that the time constraints will be met on the final solution. The system allows the making of modifications in the future to improve software components. (A.C.)

  16. COMPASS calorimetric trigger in 2012 run: motivation and implementation

    International Nuclear Information System (INIS)

    For the COMPASS experiment at CERN a dedicated run for studies on chiral perturbation theory is planned for 2012. By impinging pions to a Nickel target, at very low momentum transfer, final states containing an outgoing photon or neutral pions are produced. In order to select these events a new calorimetric trigger, reusing the already existing readout electronics, is implemented. A backplane module as well as a central trigger module is developed on which the hits form the individual cells are collected and further processing is done. The implementation as well as the first test results is presented.

  17. Fast Photon Detection for Particle Identification with COMPASS RICH-1

    OpenAIRE

    Nerling, F.(Helmholtz-Institut Mainz, GSI Helmholtzzentrum Darmstadt, Darmstadt, Germany); group, for the COMPASS RICH upgrade

    2006-01-01

    Particle identification at high rates is an important challenge for many current and future high-energy physics experiments. The upgrade of the COMPASS RICH-1 detector requires a new technique for Cherenkov photon detection at count rates of several $10^6$ per channel in the central detector region, and a read-out system allowing for trigger rates of up to 100 kHz. To cope with these requirements, the photon detectors in the central region have been replaced with the detection system describe...

  18. Hartmann test of the COMPASS RICH-1 optical telescopes

    CERN Document Server

    Polak, J; Alekseev, M; Angerer, H; Apollonio, M; Birsa, R; Bordalo, P; Bradamante, F; Bressan, A; Busso, L; Chiosso, V M; Ciliberti, P; Colantoni, M L; Costa, S; Dibiase, N; Dafni, T; Dalla Torre, S; Diaz, V; Duic, V; Delagnes, E; Deschamps, H; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Finger, M Jr; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; von Harrach, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K; Kolosov, V N; Konorov, I; Kramer, D; Kunne, F; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Rebourgeard, P; Mutter, A; Nähle, O; Neyret, D; Nerling, F; Pagano, P; Paul, S; Panebianco, S; Panzieri, D; Pesaro, G; Pizzolotto, C; Menon, G; Rocco, E; Robinet, F; Schiavon, P; Schill, C; Schoenmeier, P; Silva, L; Slunecka, M; Steiger, L; Sozzi, F; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2008-01-01

    The central region of COMPASS RICH-1 has been equipped with a new photon detection system based on MultiAnode PhotoMultiplier Tubes (MAPMT). The Cherenkov photons are focused by an array of 576 fused silica telescopes onto 576 MAPMTs. The quality and positioning of all optical components have been tested by Hartmann method. The validation procedures are described. The quality of the optical concentrators was checked and alignment corrections were made. The upgraded detector showed excellent performances during 2006 data taking.

  19. Dust Observation in the COMPASS Tokamak Using Fast Camera

    Czech Academy of Sciences Publication Activity Database

    Odstrčil, M.; Mlynář, Jan; Weinzettl, Vladimír; Háček, Pavel; Berta, M.; Szabolics, T.; Bencze, A.

    Vol. 2. Prague : MATFYZPRESS, 2013 - (Šafránková, J.; Pavlů, J.), s. 73-79 ISBN 978-80-7378-251-1. - (WDS). [Annual Conference of Doctoral Students – WDS 2013 /22./. Praha (CZ), 04.06.2013-07.06.2013] R&D Projects: GA MŠk(CZ) LM2011021 Institutional support: RVO:61389021 Keywords : COMPASS * tokamak Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/proc/pdf13/WDS13_211_f2_Odstrcil.pdf

  20. Upgrade of the COMPASS tokamak real-time control system

    Czech Academy of Sciences Publication Activity Database

    Janky, Filip; Havlíček, Josef; Batista, A.J.N.; Kudláček, Ondřej; Seidl, Jakub; Neto, A.C.; Pipek, Jan; Hron, Martin; Mikulín, Ondřej; Duarte, A.S.; Carvalho, B.B.; Stöckel, Jan; Pánek, Radomír

    2014-01-01

    Roč. 89, č. 3 (2014), s. 186-194. ISSN 0920-3796 R&D Projects: GA ČR GAP205/11/2470; GA MŠk 7G10072; GA MŠk(CZ) LM2011021 Institutional support: RVO:61389021 Keywords : Real-time * Feedback control * Real-time framework * MARTe * COMPASS tokamak Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 1.152, year: 2014 http://www. science direct.com/ science /article/pii/S0920379613007564

  1. Vacuum Control and Gas Handling for COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Janky, F.; Pereira, T.V.; Santos, B.A.; Hron, Martin

    Vol. 2. Prague: MATFYZPRESS, Prague, 2009 - (Šafránková, J.; Pavlů, J.), s. 153-157 ISBN 978-80-7378-102-6. [Annual conference of doctoral students - WDS 2009 /18./. Prague (CZ), 02.06.2009-05.06.2009] R&D Projects: GA ČR GD202/08/H057 Institutional research plan: CEZ:AV0Z20430508 Keywords : vacuum * control * tokamak COMPASS * gas handling Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/contents/pdf09/WDS09_226_f2_Janky.pdf

  2. Design of Filters for COMPASS Thomson Scattering Diagnostics

    Czech Academy of Sciences Publication Activity Database

    Aftanas, Milan; Scannell, R.; Bílková, Petra; Böhm, Petr; Weinzettl, Vladimír; Walsh, M.

    Vol. 2. Prague : MATFYZPRESS, Prague, 2009 - (Šafránková, J.; Pavlů, J.), s. 144-147 ISBN 978-80-7378-102-6. [Annual conference of doctoral students - WDS 2009 /18./. Prague (CZ), 02.06.2009-05.06.2009] R&D Projects: GA ČR GD202/08/H057 Institutional research plan: CEZ:AV0Z20430508 Keywords : Thomson scattering * COMPASS * filters Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/contents/pdf09/WDS09_224_f2_Aftanas.pdf

  3. Design and engineering of optical diagnostics for COMPASS

    Czech Academy of Sciences Publication Activity Database

    Šesták, David; Weinzettl, Vladimír; Bílková, Petra; Brotánková, Jana; Böhm, Petr; Aftanas, Milan; Naydenkova, Diana; Stöckel, Jan; Ďuran, Ivan

    Garching bei Munchen : Max-Planck-Institute fur Plasmaphysik, 2008. s. 183-183. ISBN N. [Symposium on Fusion Technology/25th./. 15.09.2008-19.09.2008, Rostock] R&D Projects: GA ČR GD202/08/H057 Institutional research plan: CEZ:AV0Z20430508 Keywords : COMPASS * tokamak * optical diagnostic * Thomson scattering Subject RIV: BL - Plasma and Gas Discharge Physics http://www.ipp.mpg.de/eng/for/veranstaltungen/soft2008/resource/abstracts/BookOfAbstracts_final.pdf

  4. Mirror alignment control for COMPASS RICH-1 detector

    Energy Technology Data Exchange (ETDEWEB)

    Alexeev, M. [INFN, Sezione di Torino and University of East Piemonte, Alessandria (Italy); Birsa, R. [INFN, Sezione di Trieste, Trieste (Italy); Bradamante, F.; Bressan, A. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Chiosso, M. [INFN, Sezione di Torino and University of Torino, Torino (Italy); Ciliberti, P. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Dalla Torre, S. [INFN, Sezione di Trieste, Trieste (Italy); Denisov, O. [INFN, Sezione di Torino, Torino (Italy); Duic, V. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Ferrero, A. [INFN, Sezione di Torino and University of Torino, Torino (Italy); Finger, M.; Finger, M. [Charles University, Praga (Czech Republic); JINR, Dubna (Russian Federation); Giorgi, M. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Gobbo, B. [INFN, Sezione di Trieste, Trieste (Italy); Levorato, S. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Maggiora, A. [INFN, Sezione di Torino, Torino (Italy); Martin, A. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Menon, G. [INFN, Sezione di Trieste, Trieste (Italy); Panzieri, D. [INFN, Sezione di Torino and University of East Piemonte, Alessandria (Italy); Pesaro, G. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy)

    2011-05-21

    The focusing system of the COMPASS RICH-1 detector consists of two segmented spherical mirror surfaces, formed by 68 hexagonal and 48 pentagonal individual elements. All individual mirrors have two degrees of freedom to adjust the angular alignment in order to obtain a continuous spherical surface. Relative angular misalignments can be monitored on-line by the CLAM method, based on the optical reconstruction of line images. Complementing the CLAM measurements with photogrammetry, the absolute mirror orientation and position in space can be determined too. The method is described, as well as the algorithms used to access the relative and absolute mirror alignment.

  5. Compassion and Literature. Neo-Sentimentalism in Literary Theory

    OpenAIRE

    Płuciennik, Jarosław; Holmqvist, Kenneth

    2005-01-01

    This version is B-version of the pre-reviewed article appeared in the journal Problems of Literary Genres/ Zagadnienia Rodzajów Literackich 48 (95-96), 2005:1-2. In our paper, we present a review of recent developments in literary theory especially in the theory by Martha Nussbaum focusing on a role of compassion in literary studies. Our main thesis is that neo-sentimentalism is visible in three areas of Martha Nussbaum’s thought: first, in her views of emotions (she try to persuade reader...

  6. Transverse Momentum Effects in Unpolarised SIDIS at COMPASS

    Directory of Open Access Journals (Sweden)

    Makke Nour

    2015-01-01

    Full Text Available Unpolarised semi-inclusive DIS is receiving a growing interest as a powerful tool to access poorly known universal functions that play a key role in many processes, in particular in the study of the spin structure of the nucleon. These functions can be investigated through experimental observables such as hadron multiplicities in the collinear and transverse framework, the dihadron multiplicities, the azimuthal asymmetries and some others. New results on these observables by the COMPASS experiment at CERN will be shown and discussed.

  7. FPGA based data acquisition system for COMPASS experiment

    International Nuclear Information System (INIS)

    This paper presents the current data acquisition system (DAQ) of the COMPASS experiment at CERN and discusses development of a new DAQ. The aim of the new DAQ is to substitute software event building by structure composed of special FPGA cards that will do the event building. The software part of the new DAQ is robust multinode system with high emphasis on reliability. It is based on state machines and implemented in C++ with usage of the QT framework, the DIM library, and the IPBus technology. A prototype of the system has been developed and tested. The new DAQ software fulfills given requirements.

  8. The DEMO Quasisymmetric Stellarator

    Directory of Open Access Journals (Sweden)

    Geoffrey B. McFadden

    2010-02-01

    Full Text Available The NSTAB nonlinear stability code solves differential equations in conservation form, and the TRAN Monte Carlo test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These codes are well correlated with experimental observations and have been validated by convergence studies. Bifurcated 3D solutions of the 2D tokamak problem have been calculated that model persistent disruptions, neoclassical tearing modes (NTMs and edge localized modes (ELMs occurring in the International Thermonuclear Experimental Reactor (ITER, which does not pass the NSTAB simulation test for nonlinear stability. So we have designed a quasiaxially symmetric (QAS stellarator with similar proportions as a candidate for the demonstration (DEMO fusion reactor that does pass the test [1]. The configuration has two field periods and an exceptionally accurate 2D symmetry that furnishes excellent thermal confinement and good control of the prompt loss of alpha particles. Robust coils are found from a filtered form of the Biot-Savart law based on a distribution of current over a control surface for the coils and the current in the plasma defined by the equilibrium calculation. Computational science has addressed the issues of equilibrium, stability, and transport, so it remains to develop an effective plan to construct the coils and build a diverter.

  9. Truncations in stellar disks

    CERN Document Server

    Van der Kruit, P C

    2000-01-01

    The presence of radial truncations in stellar disks is reviewed. There is ample evidence that many disk galaxies have relatively shaprt truncations in their disks. These often are symmetric and independent of the wavelength band of the observations. The ratio of the truncation radius R_{max} to the disk scalelength h appears often less then 4.5, as expected on a simple model for the disk collapse. Current samples of galaxies observed may however not be representative and heavily biased towards sisks witht he largest scalelengths. Many spiral galaxies also have HI warps and these generally start at the truncation radius of the stellar disk. The HI surface density suddenly becomes much flatter with radius. In some galaxies the start of the warp and the position of the disk truncation radius is accompanied by a drop in the rotation velocity. In the regiosn beyond the dis truncation in the HI layer some star formation does occur, but the heavy element abundance and the dust content are very low. All evidence is c...

  10. The DEMO quasisymmetric stellarator

    International Nuclear Information System (INIS)

    The NSTAB nonlinear stability code solves differential equations in conservation form, and the TRAN Monte Carlo test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These codes are well correlated with experimental observations and have been validated by convergence studies. Bifurcated 3D solutions of the 2D tokamak problem have been calculated that model persistent disruptions, neoclassical tearing modes (NTMs) and edge localized modes (ELMs) occurring in the International Thermonuclear Experimental Reactor (ITER), which does not pass the NSTAB simulation test for nonlinear stability. So we have designed a quasi axially symmetric (QAS) stellarator with similar proportions as a candidate for the demonstration (DEMO) fusion reactor that does pass the test [1]. The configuration has two field periods and an exceptionally accurate 2D symmetry that furnishes excellent thermal confinement and good control of the prompt loss of alpha particles. Robust coils are found from a filtered form of the Biot-Savart law based on a distribution of current over a control surface for the coils and the current in the plasma defined by the equilibrium calculation. Computational science has addressed the issues of equilibrium, stability, and transport, so it remains to develop an effective plan to construct the coils and build a diverter. (author)

  11. Stellar axion models

    Energy Technology Data Exchange (ETDEWEB)

    Nowakowski, Daniel; Kuster, Markus; Meister, Claudia V.; Fuelbert, Florian; Hoffmann, Dieter H.H. [TU Darmstadt (Germany). Institut fuer Kernphysik; Weiss, Achim [Max-Planck-Institut fuer Astrophysik, Garching (Germany)

    2010-07-01

    An axion helioscope is typically operated to observe the sun as an axion source. Additional pointings at celestial sources, e.g. stars in other galaxies, result in possible detections of axions from distant galactic objects. For the observation of supplementary axion sources we therefore calculate the thereotical axion flux from distant stars by extending axionic flux models for the axion Primakoff effect in the sun to other main sequence stars. The main sequence star models used for our calculations are based on full stellar structure calculations. To deduce the effective axion flux of stellar objects incident on the Earth the All-Sky catalogue was used to obtain the spectral class and distance of the stars treated. Our calculations of the axion flux in the galactic plane show that for a zero age main sequence star an maximum axion flux of {phi}{sub a}=303.43 cm{sup -2}s{sup -1} could be expected. Furthermore we present estimates of axion fluxes from time-evolved stars.

  12. Stellar axion models

    International Nuclear Information System (INIS)

    An axion helioscope is typically operated to observe the sun as an axion source. Additional pointings at celestial sources, e.g. stars in other galaxies, result in possible detections of axions from distant galactic objects. For the observation of supplementary axion sources we therefore calculate the thereotical axion flux from distant stars by extending axionic flux models for the axion Primakoff effect in the sun to other main sequence stars. The main sequence star models used for our calculations are based on full stellar structure calculations. To deduce the effective axion flux of stellar objects incident on the Earth the All-Sky catalogue was used to obtain the spectral class and distance of the stars treated. Our calculations of the axion flux in the galactic plane show that for a zero age main sequence star an maximum axion flux of Φa=303.43 cm-2s-1 could be expected. Furthermore we present estimates of axion fluxes from time-evolved stars.

  13. Lattice stellar dynamics

    CERN Document Server

    Syer, D; Syer, D; Tremaine, S

    1995-01-01

    We describe a technique for solving the combined collisionless Boltzmann and Poisson equations in a discretised, or lattice, phase space. The time and the positions and velocities of `particles' take on integer values, and the forces are rounded to the nearest integer. The equations of motion are symplectic. In the limit of high resolution, the lattice equations become the usual integro-differential equations of stellar dynamics. The technique complements other tools for solving those equations approximately, such as N-body simulation, or techniques based on phase-space grids. Equilibria are found in a variety of shapes and sizes. They are true equilibria in the sense that they do not evolve with time, even slowly, unlike existing N-body approximations to stellar systems, which are subject to two-body relaxation. They can also be `tailor-made' in the sense that the mass distribution is constrained to be close to some pre-specified function. Their principal limitation is the amount of memory required to store ...

  14. Problems of stellar evolution

    International Nuclear Information System (INIS)

    Three facets of the stellar and cluster content of the Magellanic clouds are presented in this observational study. Spectra and photometry of superluminous giants, stars which are much brighter than predicted by stellar evolution theory, are studied to attempt to constrain models of the evolutionary state of these stars. Color-magnitude diagrams are constructed of three clusters, NGC 1711, NGC 1755, and NGC 2041, which may be the youngest clusters capable of making superluminous stars. A preliminary color-magnitude diagram of Kron 34, SMC cluster which may contain a planetary nebula, is discussed. The second topic concerns the age and size distribution of the open clusters in the field of the cluster NGC 1978. This work is compared to previous studies, and shows that the region just north of Constellation III has undergone vigorous recent (less than 108 years ago) star formation. The lack of old (older than 109 years) clusters in this field is discussed. A new type of nebulous object, called wisps, is briefly examined. Finally, a color-magnitude diagram of NGC 1978 is presented. Based on a new photoelectric sequence, and photographic photometry m/sub v/ about 21.5, the work exploits two elegant data reduction techniques now available to the astronomical community. These programs are RICHFLD, available at Kitt Peak, and a generalized color-magnitude diagram program written by William Harris and collaborators. The age and metal abundance of NGC 1978 is derived, and compared to previous investigation

  15. Stellar populations of stellar halos: Results from the Illustris simulation

    CERN Document Server

    Cook, B A; Pillepich, A; Hernquist, L

    2015-01-01

    The influence of both major and minor mergers is expected to significantly affect gradients of stellar ages and metallicities in the outskirts of galaxies. Measurements of observed gradients are beginning to reach large radii in galaxies, but a theoretical framework for connecting the findings to a picture of galactic build-up is still in its infancy. We analyze stellar populations of a statistically representative sample of quiescent galaxies over a wide mass range from the Illustris simulation. We measure metallicity and age profiles in the stellar halos of quiescent Illustris galaxies ranging in stellar mass from $10^{10}$ to $10^{12} M_\\odot$, accounting for observational projection and luminosity-weighting effects. We find wide variance in stellar population gradients between galaxies of similar mass, with typical gradients agreeing with observed galaxies. We show that, at fixed mass, the fraction of stars born in-situ within galaxies is correlated with the metallicity gradient in the halo, confirming th...

  16. Three-dimensional stellarator codes

    OpenAIRE

    Garabedian, P. R.

    2002-01-01

    Three-dimensional computer codes have been used to develop quasisymmetric stellarators with modular coils that are promising candidates for a magnetic fusion reactor. The mathematics of plasma confinement raises serious questions about the numerical calculations. Convergence studies have been performed to assess the best configurations. Comparisons with recent data from large stellarator experiments serve to validate the theory.

  17. Light Scalar Mesons in Central Production at COMPASS

    CERN Document Server

    Austregesilo, A

    2016-01-01

    COMPASS is a fixed-target experiment at the CERN SPS that studies the spectrum of light-quark hadrons. In 2009, it collected a large dataset using a $190\\,$GeV$/c$ positive hadron beam impinging on a liquid-hydrogen target in order to measure the central exclusive production of light scalar mesons. One of the goals is the search for so-called glueballs, which are hypothetical meson-like objects without valence-quark content. We study the decay of neutral resonances by selecting centrally produced pion pairs from the COMPASS dataset. The angular distributions of the two pseudoscalar mesons are decomposed in terms of partial waves, where particular attention is paid to the inherent mathematical ambiguities. The large dataset allows us to perform a detailed analysis in bins of the two squared four-momentum transfers carried by the exchange particles in the reaction. Possible parameterisations of the mass dependence of the partial-wave amplitudes in terms of resonances are also discussed.

  18. Longitudinal {lambda} and anti {lambda} polarization at the COMPASS experiment

    Energy Technology Data Exchange (ETDEWEB)

    Kang, Donghee

    2007-09-15

    At the COMPASS experiment at CERN {lambda} and anti {lambda} particles are produced in deep inelastic scattering (DIS) processes with high statistics. The main focus of the research is the understanding of the spin transfer mechanism from quarks to hadrons through the fragmentation process by utilizing the longitudinal {lambda} and anti {lambda} polarization. The result of the spin transfer provides useful information to test different model predictions which describe spin effects in hyperon production and the quark-antiquark asymmetry of the nucleon and hyperon. The {lambda} and anti {lambda} polarization are determined by measuring the acceptance corrected angular distribution of its decay products. A Monte Carlo simulation is used to correct the acceptance of the COMPASS spectrometer. In this work, preliminary results from data collected in the current fragmentation region during 2002-2004 are presented. A significantly positive average spin transfer of anti {lambda} is found to be equal to C{sub LL}=+0.232{+-}0.039(stat.){+-}0.022(sys.), while the spin transfer of lambda is compatible with zero within the statistical accuracy. The dependences of the spin transfer on various kinematic variables are also presented. (orig.)

  19. Switched Control of a Time Delayed Compass Gait Robot

    Directory of Open Access Journals (Sweden)

    Elyes Maherzi

    2016-07-01

    Full Text Available the analysis and control of delayed systems are becoming more and more research topics in progress. This is mainly due to the fact that the delay is frequently encountered in technological systems. Most control command laws are based on current digital computers and delays are intrinsic to the process or in the control loop caused by the transmission time control sequences, or computing time. In other hand, the controls of humanoid walking robot present a common problem in robotics because it involves physical interaction between an articulated system and its environment. This close relationship is actually a common set of fundamental problems such as the implementation of robust stable dynamic control. This paper presents acomplete approach, based on switched system theory, for the stabilization of a compass gait robot subject to time delays transmission. The multiple feedback gains designed are based on multiple linear systems governed by a switching control law. The establishment of control law in real time is affected by the unknown pounded random delay. The results obtained from this method show that the control law stabilize the compass robot walk despite a varying delay reaching six times sampling period.

  20. Plasma parameters in the COMPASS divertor during Ohmic plasmas

    Energy Technology Data Exchange (ETDEWEB)

    Dimitrova, M. [Institute of Plasma Physics, Academy of Sciences of the Czech Republic v.v.i., Prague (Czech Republic); Emil Djakov Institute of Electronics, Bulgarian Academy of Sciences, Sofia (Bulgaria); Dejarnac, R.; Stoeckel, J.; Havlicek, J.; Janky, F.; Panek, R. [Institute of Plasma Physics, Academy of Sciences of the Czech Republic v.v.i., Prague (Czech Republic); Popov, Ts.K. [Faculty of Physics, St. Kl. Ohridski University of Sofia (Bulgaria); Ivanova, P.; Vasileva, E. [Emil Djakov Institute of Electronics, Bulgarian Academy of Sciences, Sofia (Bulgaria); Kovacic, J. [Jozef Stefan Institute, Ljubljana (Slovenia)

    2014-04-15

    This paper reports on probe measurements of the electron energy distribution function and plasma potential in the divertor region of the COMPASS tokamak during D-shaped plasmas. The probe data have been processed using the novel first-derivative technique. A comparison with the results obtained by processing the same data with the classical probe technique, which assumes Maxwellian electron energy distribution functions is presented and discussed. In the vicinity of the inner and outer strike points of the divertor the electron energy distribution function can be approximated by a bi-Maxwellian, with a dominating low-energy electron population (4-7 eV) and a minority of higher energy electrons (12-25 eV). In the private flux region between the two strike points the electron energy distribution function is found to be Maxwellian with temperatures in the range of 7-10 eV. The comparative analysis using both techniques has allowed a better insight into the underlying physical processes at the divertor region of the COMPASS tokamak. (copyright 2014 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  1. Single-hadron transverse target spin asymmetries at COMPASS

    Energy Technology Data Exchange (ETDEWEB)

    Adolph, Christoph [Physikalisches Institut IV der Universitaet Erlangen-Nuernberg (Germany); Collaboration: COMPASS collaboration

    2013-07-01

    The quark content of the nucleon at twist-two level in the collinear case can be fully described by three independent distribution functions for each quark flavour: the unpolarized distribution function f{sub 1}(x), the helicity distribution function g{sub 1}(x) and the transverse spin distribution function h{sub 1}(x), also called transversity. The measurement of single spin asymmetries in semi-inclusive deep inelastic scattering (SIDIS) on a transversely polarized target are an important part of the COMPASS physics program. By extracting azimuthal asymmetries in hadron production one can access both the Collins fragmentation function and the Sivers distribution function. The COMPASS collaboration has measured these asymmetries in the scattering of a 160 GeV/c polarized μ{sup +} beam off a transversely polarized {sup 6}LiD (deuteron) target in the years 2002-2004 and off a transversely polarized NH{sub 3} (proton) target in 2007 and 2010. In this contribution we especially present results from the 2010 data for the Collins and Sivers asymmetries for identified pions and kaons.

  2. Single-hadron transverse target spin asymmetries at COMPASS

    International Nuclear Information System (INIS)

    The quark content of the nucleon at twist-two level in the collinear case can be fully described by three independent distribution functions for each quark flavour: the unpolarized distribution function f1(x), the helicity distribution function g1(x) and the transverse spin distribution function h1(x), also called transversity. The measurement of single spin asymmetries in semi-inclusive deep inelastic scattering (SIDIS) on a transversely polarized target are an important part of the COMPASS physics program. By extracting azimuthal asymmetries in hadron production one can access both the Collins fragmentation function and the Sivers distribution function. The COMPASS collaboration has measured these asymmetries in the scattering of a 160 GeV/c polarized μ+ beam off a transversely polarized 6LiD (deuteron) target in the years 2002-2004 and off a transversely polarized NH3 (proton) target in 2007 and 2010. In this contribution we especially present results from the 2010 data for the Collins and Sivers asymmetries for identified pions and kaons.

  3. Intervening to Improve Compassion Fatigue Resiliency in Forensic Nurses.

    Science.gov (United States)

    Flarity, Kathleen; Nash, Kim; Jones, Whitney; Steinbruner, Dave

    2016-01-01

    Evidence suggests that forensic nurses (FNs) may be predisposed to compassion fatigue (CF) as a result of the challenges of the profession including high caseloads, role ambiguity, prosecution goals, vicarious traumatization, attending to survivors' emotional needs, and empowering victims. The purpose of this exploratory study was to determine the prevalence of CF in a convenience sample of 55 FNs and examine the treatment effectiveness of a multifaceted education program in an intervention subset. The intervention was intended to increase compassion satisfaction (CS) and decrease CF symptoms in FNs in one organization who participated in the training. The hypothesis was that the FNs will have moderate to high CF and moderate to high CS and the CF intervention will add in CF prevention and resiliency as measured with an improvement in the Professional Quality of Life test scores (B. H. ). In the prevalence sample, 69% of the FNs had moderate to low CS, 73% had moderate to high burnout, and 73% had moderate to high levels of secondary traumatic stress (STS). In the intervention group, the education program resulted in a statistically significant increase in CS and decreases in STS symptoms. PMID:27139136

  4. Polarised Drell-Yan measurements at $\\mathrm{COMPASS}$

    CERN Document Server

    Chiosso, Michela

    2015-01-01

    Much of the information that exists today about Transverse Momentum Dependent Parton Distribution Functions (TMDs) comes from SIDIS measurements with unpolarised and polarised beams and targets where they appear convoluted with fragmentation functions (FFs). Drell-Yan (DY) measurements are complementary to those by SIDIS experiments, as they allow to measure convolutions of only Parton Distribution Functions (PDFs) without involving FFs. Moreover, given the T-odd character of both Sivers and Boer-Mulders functions, the sign of these TMDs is expected to be reversed when observed from SIDIS or from DY. Measurements of SIDIS were performed by Compass in the period 2002 to 2007 and in 2010, using a naturally polarised μ+ beam and a solid state target polarised either longitudinally or transversely with respect to the beam direction. Now the COMPASS Experiment has the unique opportunity to access TMDs from single-polarised Drell-Yan processes as well, in the same kinematical domain of the SIDIS data and with the ...

  5. Longitudinal Λ and anti Λ polarization at the COMPASS experiment

    International Nuclear Information System (INIS)

    At the COMPASS experiment at CERN Λ and anti Λ particles are produced in deep inelastic scattering (DIS) processes with high statistics. The main focus of the research is the understanding of the spin transfer mechanism from quarks to hadrons through the fragmentation process by utilizing the longitudinal Λ and anti Λ polarization. The result of the spin transfer provides useful information to test different model predictions which describe spin effects in hyperon production and the quark-antiquark asymmetry of the nucleon and hyperon. The Λ and anti Λ polarization are determined by measuring the acceptance corrected angular distribution of its decay products. A Monte Carlo simulation is used to correct the acceptance of the COMPASS spectrometer. In this work, preliminary results from data collected in the current fragmentation region during 2002-2004 are presented. A significantly positive average spin transfer of anti Λ is found to be equal to CLL=+0.232±0.039(stat.)±0.022(sys.), while the spin transfer of lambda is compatible with zero within the statistical accuracy. The dependences of the spin transfer on various kinematic variables are also presented. (orig.)

  6. The new spin physics program of the COMPASS experiment

    Directory of Open Access Journals (Sweden)

    Silva Luís

    2015-01-01

    Full Text Available The COMPASS experiment, at CERN SPS, has been compiling for more than a decade successful and precise results on nucleon structure and hadron spectroscopy, leading to statistical errors much smaller than previously measured. The new COMPASS spin physics program, starting this year, aims to a rather complete nucleon structure description; this new representation goes beyond the collinear approximation by including the quark intrinsic transverse momentum distributions. The theoretical framework, for this new picture of the nucleon, is given by the Transverse Momentum Dependent distributions (TMDs and by the Generalised Parton Distributions (GPDs. The TMDs, in particular Sivers, Boer-Mulders, pretzelosity and transversity functions will be obtained through the polarised Drell-Yan process, for the first time. The results will be complementary to those already obtained via polarised Semi-Inclusive Deep Inelastic Scattering (SIDIS. Also unpolarised SIDIS will be studied, allowing the knowledge improvement of the strange quark PDF and the access to the kaon fragmentation functions (FFs. Deeply Virtual Compton Scattering (DVCS off an unpolarised hydrogen target will be used to study the GPDs, in a kinematic region not yet covered by any existing experiment.

  7. The Compass Model to plan faculty development programs

    Directory of Open Access Journals (Sweden)

    Mohamed Mostafa Al-Eraky

    2012-05-01

    Full Text Available Faculty development is an imperative if institutions are to develop professional and competent teachers, educators, researchers and leaders. Planning of faculty development currently focuses on meeting the perceived needs of staff and their interests. We would like to propose the Compass Model as a conceptual framework to plan faculty development, which was inspired by the interplay between intrinsic and extrinsic forces for learning, as outlined in the Self-Determination Theory (SDT. In planning faculty development, the Compass Model acknowledges four agendas (directions from various stakeholders: Strategies (N, Competencies (E, Resources (S and Wish lists (W. The model then describes four avenues for faculty development offerings (quadrants: Foundation (NE, Innovation (SE, Response (SW and Motivation (NW (i.e. outputs, activities. The model was compared theoretically with another approach to faculty development planning. It was then piloted as a quality measure for a current program to check for omissions or missed opportunities. We plan to use it in a multi-center study to compare approaches in faculty development planning in different contexts. We hope our model assists faculty developers to consider all stakeholders’ agendas when planning faculty development, beyond the current standard customer-based approach.

  8. Stellarator - tokamak configurations

    International Nuclear Information System (INIS)

    The stellarator configuration and tokamak configuration with helical fields have been studied both from an equilibrium and stability point of view. The model was restricted to a surface current model with a sharp boundary between plasma and vacuum. A general derivation of equilibrium and stability based on the Energy Principle is given. Physically the unstable modes are identified as external global modes. Detailed numerical results in different parameter regimes are presented and discussed. Critical β-limits for equilibrium and stability are obtained and in particular it is shown that in certain parameter ranges there exist a high-β as well as a low-β-region of stability. 7 refs., 14 figs

  9. Nucleosynthesis in stellar explosions

    Energy Technology Data Exchange (ETDEWEB)

    Woosley, S.E.; Axelrod, T.S.; Weaver, T.A.

    1983-01-01

    The final evolution and explosion of stars from 10 M/sub solar/ to 10/sup 6/ M/sub solar/ are reviewed with emphasis on factors affecting the expected nucleosynthesis. We order our paper in a sequence of decreasing mass. If, as many suspect, the stellar birth function was peaked towards larger masses at earlier times (see e.g., Silk 1977; but also see Palla, Salpeter, and Stahler 1983), this sequence of masses might also be regarded as a temporal sequence. At each stage of Galactic chemical evolution stars form from the ashes of preceding generations which typically had greater mass. A wide variety of Type I supernova models, most based upon accreting white dwarf stars, are also explored using the expected light curves, spectra, and nucleosynthesis as diagnostics. No clearly favored Type I model emerges that is capable of simultaneously satisfying all three constraints.

  10. Nucleosynthesis in stellar explosions

    International Nuclear Information System (INIS)

    The final evolution and explosion of stars from 10 M/sub solar/ to 106 M/sub solar/ are reviewed with emphasis on factors affecting the expected nucleosynthesis. We order our paper in a sequence of decreasing mass. If, as many suspect, the stellar birth function was peaked towards larger masses at earlier times (see e.g., Silk 1977; but also see Palla, Salpeter, and Stahler 1983), this sequence of masses might also be regarded as a temporal sequence. At each stage of Galactic chemical evolution stars form from the ashes of preceding generations which typically had greater mass. A wide variety of Type I supernova models, most based upon accreting white dwarf stars, are also explored using the expected light curves, spectra, and nucleosynthesis as diagnostics. No clearly favored Type I model emerges that is capable of simultaneously satisfying all three constraints

  11. Rethinking Compassion Fatigue Through the Lens of Professional Identity: The Case of Child-Protection Workers.

    Science.gov (United States)

    Geoffrion, Steve; Morselli, Carlo; Guay, Stéphane

    2016-07-01

    Compassion fatigue is currently the dominant model in work-related stress studies that explain the consequences of caring for others on child-protection workers. Based on a deterministic approach, this model excludes the role of cognition a priori and a posteriori in the understanding of the impact of caregiving or providing social support. By integrating the notion of professional identity, this article adds a subjective perspective to the compassion fatigue model allowing for the consideration of positive outcomes and takes into account the influence of stress caused by accountability. Mainly, it is argued that meanings derived from identity and given to situations may protect or accelerate the development of compassion fatigue or compassion satisfaction. To arrive at this proposition, the notions of compassion fatigue and identity theory are first reviewed. These concepts are then articulated around four work-related stressors specific to child-protection work. In light of this exercise, it is argued that professional identity serves as a subjective interpretative framework that guides the understanding of work-related situations. Therefore, compassion fatigue is not only a simple reaction to external stimuli. It is influenced by meanings given to the situation. Furthermore, professional identity modulates the impact of compassion fatigue on psychological well-being. Practice, policy, and research implications in light of these findings are also discussed. PMID:25985989

  12. What is compassion and how can we measure it? A review of definitions and measures.

    Science.gov (United States)

    Strauss, Clara; Lever Taylor, Billie; Gu, Jenny; Kuyken, Willem; Baer, Ruth; Jones, Fergal; Cavanagh, Kate

    2016-07-01

    The importance of compassion is widely recognized and it is receiving increasing research attention. Yet, there is lack of consensus on definition and a paucity of psychometrically robust measures of this construct. Without an agreed definition and adequate measures, we cannot study compassion, measure compassion or evaluate whether interventions designed to enhance compassion are effective. In response, this paper proposes a definition of compassion and offers a systematic review of self- and observer-rated measures. Following consolidation of existing definitions, we propose that compassion consists of five elements: recognizing suffering, understanding the universality of human suffering, feeling for the person suffering, tolerating uncomfortable feelings, and motivation to act/acting to alleviate suffering. Three databases were searched (Web of Science, PsycInfo, and Medline) and nine measures included and rated for quality. Quality ratings ranged from 2 to 7 out of 14 with low ratings due to poor internal consistency for subscales, insufficient evidence for factor structure and/or failure to examine floor/ceiling effects, test-retest reliability, and discriminant validity. We call our five-element definition, and if supported, the development of a measure of compassion based on this operational definition, and which demonstrates adequate psychometric properties. PMID:27267346

  13. Alaska Athabascan stellar astronomy

    Science.gov (United States)

    Cannon, Christopher M.

    Stellar astronomy is a fundamental component of Alaska Athabascan cultures that facilitates time-reckoning, navigation, weather forecasting, and cosmology. Evidence from the linguistic record suggests that a group of stars corresponding to the Big Dipper is the only widely attested constellation across the Northern Athabascan languages. However, instruction from expert Athabascan consultants shows that the correlation of these names with the Big Dipper is only partial. In Alaska Gwich'in, Ahtna, and Upper Tanana languages the Big Dipper is identified as one part of a much larger circumpolar humanoid constellation that spans more than 133 degrees across the sky. The Big Dipper is identified as a tail, while the other remaining asterisms within the humanoid constellation are named using other body part terms. The concept of a whole-sky humanoid constellation provides a single unifying system for mapping the night sky, and the reliance on body-part metaphors renders the system highly mnemonic. By recognizing one part of the constellation the stargazer is immediately able to identify the remaining parts based on an existing mental map of the human body. The circumpolar position of a whole-sky constellation yields a highly functional system that facilitates both navigation and time-reckoning in the subarctic. Northern Athabascan astronomy is not only much richer than previously described; it also provides evidence for a completely novel and previously undocumented way of conceptualizing the sky---one that is unique to the subarctic and uniquely adapted to northern cultures. The concept of a large humanoid constellation may be widespread across the entire subarctic and have great antiquity. In addition, the use of cognate body part terms describing asterisms within humanoid constellations is similarly found in Navajo, suggesting a common ancestor from which Northern and Southern Athabascan stellar naming strategies derived.

  14. Old stellar populations how to study the fossil record of galaxy formation

    CERN Document Server

    Cassisi, Santi

    2013-01-01

    The book discusses the theoretical path to decoding the information gathered from observations of old stellar systems. It focuses on old stellar systems because these are the fossil record of galaxy formation and provide invaluable information ont he evolution of cosmic structures and the universe as a whole. The aim is to present results obtained in the past few years for theoretical developments in low mass star research and in advances in our knowledge of the evolution of old stellar systems. A particularly representative case is the recent discovery of multiple stellar populations in galac

  15. A community of scientists: cultivating scientific identity among undergraduates within the Berkeley Compass Project

    Science.gov (United States)

    Aceves, Ana V.; Berkeley Compass Project

    2015-01-01

    The Berkeley Compass Project is a self-formed group of graduate and undergraduate students in the physical sciences at UC Berkeley. Our goals are to improve undergraduate physics education, provide opportunities for professional development, and increase retention of students from populations typically underrepresented in the physical sciences. For students who enter as freshmen, the core Compass experience consists of a summer program and several seminar courses. These programs are designed to foster a diverse, collaborative student community in which students engage in authentic research practices and regular self-reflection. Compass encourages undergraduates to develop an identity as a scientist from the beginning of their university experience.

  16. Quantum limit for avian magnetoreception: How sensitive can a chemical compass be?

    CERN Document Server

    Cai, Jianming; Plenio, Martin B

    2011-01-01

    The chemical compass model, based on radical pair reactions, is a fascinating idea to explain avian magnetoreception. At present, questions concerning the key ingredients responsible for the high sensitivity of a chemical compass and the possible role of quantum coherence and decoherence remain unsolved. Here, we investigate the optimized hyperfine coupling for a chemical compass in order to achieve the best magnetic field sensitivity. We demonstrate that its magnetic sensitivity limit can be further extended by simple quantum control and may benefit from additional decoherence. The present results also provide routes towards the design a biomimetic weak magnetic field sensor.

  17. Understanding the roles of self-esteem, self-compassion, and fear of self-compassion in eating disorder pathology: an examination of female students and eating disorder patients.

    Science.gov (United States)

    Kelly, Allison C; Vimalakanthan, Kiruthiha; Carter, Jacqueline C

    2014-08-01

    The present study examined the relative contributions of self-compassion, fear of self-compassion, and self-esteem in eating disorder pathology. One-hundred and fifty-five female undergraduate students and 97 females entering eating disorder treatment completed the Self-Compassion Scale, Fears of Compassion Scale, Rosenberg Self-Esteem Inventory, and Eating Disorder Examination Questionnaire. T-tests revealed that the patient group had lower mean self-compassion and higher mean fear of self-compassion than the student group. When controlling for self-esteem, high fear of self-compassion emerged as the strongest predictor of eating disorder pathology in the patient group, whereas low self-compassion was the strongest predictor in the student group. These preliminary results suggest that targeting fear of self-compassion may be important when intervening with individuals suffering from an eating disorder, whereas building self-compassion may be a valuable approach for eating disorder prevention. PMID:25064287

  18. Towards 21st Century Stellar Models: Star Clusters, Supercomputing, and Asteroseismology

    CERN Document Server

    Campbell, S W; D'Orazi, V; Meakin, C; Stello, D; Christensen-Dalsgaard, J; Kuehn, C; De Silva, G M; Arnett, W D; Lattanzio, J C; MacLean, B T

    2015-01-01

    Stellar models provide a vital basis for many aspects of astronomy and astrophysics. Recent advances in observational astronomy -- through asteroseismology, precision photometry, high-resolution spectroscopy, and large-scale surveys -- are placing stellar models under greater quantitative scrutiny than ever. The model limitations are being exposed and the next generation of stellar models is needed as soon as possible. The current uncertainties in the models propagate to the later phases of stellar evolution, hindering our understanding of stellar populations and chemical evolution. Here we give a brief overview of the evolution, importance, and substantial uncertainties of core helium burning stars in particular and then briefly discuss a range of methods, both theoretical and observational, that we are using to advance the modelling.

  19. Non-verbal communication of compassion: measuring psychophysiologic effects

    Directory of Open Access Journals (Sweden)

    Kemper Kathi J

    2011-12-01

    Full Text Available Abstract Background Calm, compassionate clinicians comfort others. To evaluate the direct psychophysiologic benefits of non-verbal communication of compassion (NVCC, it is important to minimize the effect of subjects' expectation. This preliminary study was designed to a test the feasibility of two strategies for maintaining subject blinding to non-verbal communication of compassion (NVCC, and b determine whether blinded subjects would experience psychophysiologic effects from NVCC. Methods Subjects were healthy volunteers who were told the study was evaluating the effect of time and touch on the autonomic nervous system. The practitioner had more than 10 years' experience with loving-kindness meditation (LKM, a form of NVCC. Subjects completed 10-point visual analog scales (VAS for stress, relaxation, and peacefulness before and after LKM. To assess physiologic effects, practitioners and subjects wore cardiorespiratory monitors to assess respiratory rate (RR, heart rate (HR and heart rate variability (HRV throughout the 4 10-minute study periods: Baseline (both practitioner and subjects read neutral material; non-tactile-LKM (subjects read while the practitioner practiced LKM while pretending to read; tactile-LKM (subjects rested while the practitioner practiced LKM while lightly touching the subject on arms, shoulders, hands, feet, and legs; Post-Intervention Rest (subjects rested; the practitioner read. To assess blinding, subjects were asked after the interventions what the practitioner was doing during each period (reading, touch, or something else. Results Subjects' mean age was 43.6 years; all were women. Blinding was maintained and the practitioner was able to maintain meditation for both tactile and non-tactile LKM interventions as reflected in significantly reduced RR. Despite blinding, subjects' VAS scores improved from baseline to post-intervention for stress (5.5 vs. 2.2, relaxation (3.8 vs. 8.8 and peacefulness (3.8 vs. 9.0, P

  20. The Hibernating Stellar Magnet

    Science.gov (United States)

    2008-09-01

    First Optically Active Magnetar-Candidate Discovered Astronomers have discovered a most bizarre celestial object that emitted 40 visible-light flashes before disappearing again. It is most likely to be a missing link in the family of neutron stars, the first case of an object with an amazingly powerful magnetic field that showed some brief, strong visible-light activity. Hibernating Stellar Magnet ESO PR Photo 31/08 The Hibernating Stellar Magnet This weird object initially misled its discoverers as it showed up as a gamma-ray burst, suggesting the death of a star in the distant Universe. But soon afterwards, it exhibited some unique behaviour that indicates its origin is much closer to us. After the initial gamma-ray pulse, there was a three-day period of activity during which 40 visible-light flares were observed, followed by a brief near-infrared flaring episode 11 days later, which was recorded by ESO's Very Large Telescope. Then the source became dormant again. "We are dealing with an object that has been hibernating for decades before entering a brief period of activity", explains Alberto J. Castro-Tirado, lead author of a paper in this week's issue of Nature. The most likely candidate for this mystery object is a 'magnetar' located in our own Milky Way galaxy, about 15 000 light-years away towards the constellation of Vulpecula, the Fox. Magnetars are young neutron stars with an ultra-strong magnetic field a billion billion times stronger than that of the Earth. "A magnetar would wipe the information from all credit cards on Earth from a distance halfway to the Moon," says co-author Antonio de Ugarte Postigo. "Magnetars remain quiescent for decades. It is likely that there is a considerable population in the Milky Way, although only about a dozen have been identified." Some scientists have noted that magnetars should be evolving towards a pleasant retirement as their magnetic fields decay, but no suitable source had been identified up to now as evidence for

  1. Analysis and proposal of the new architecture of the selected parts of the software support of the COMPASS experiment

    CERN Document Server

    Jary, Vladimir

    This work focuses on the data acquisition system of the Compass experiment at CERN. At first the database current subsystem that suffered from increased load during year 2009 is analysed. The reasons of problems are identified and new architecture that includes replication, backups, and monitoring for achieving the high availability and reliability is proposed and implemented. Several advanced database features including partitioned tables or storage engines are described and tested. Then, the process of implementation of the remote control and monitoring of the experiment is explained. As the existing data acquisition system is partly based on a deprecated technologies, development of a new architecture has started. We focus on requirements analysis and proposal of a control and monitoring software for the new hardware platform based on the FPGA technology. The software is to be deployed in a heterogenous network environment. According to the proposal, the system is built on the DIM communication library. Ro...

  2. Stellar Evolutionary Models: challenges from observations of stellar systems

    OpenAIRE

    Cassisi, S.

    2007-01-01

    We briefly review some constraints (Owing to the limited number of pages of present review, only a sub-sample of the topics discussed during the talk are briefly summarized. For the interested readers we are pleased to send them upon request the complete presentation file.) for stellar models in various mass regimes and evolutionary stages as provided by observational data from spectroscopy to multi-wavelenghts photometry. The accuracy of present generation of stellar models can be significan...

  3. Stellar populations of stellar halos: Results from the Illustris simulation

    Science.gov (United States)

    Cook, B. A.; Conroy, C.; Pillepich, A.; Hernquist, L.

    2016-08-01

    The influence of both major and minor mergers is expected to significantly affect gradients of stellar ages and metallicities in the outskirts of galaxies. Measurements of observed gradients are beginning to reach large radii in galaxies, but a theoretical framework for connecting the findings to a picture of galactic build-up is still in its infancy. We analyze stellar populations of a statistically representative sample of quiescent galaxies over a wide mass range from the Illustris simulation. We measure metallicity and age profiles in the stellar halos of quiescent Illustris galaxies ranging in stellar mass from 1010 to 1012 M ⊙, accounting for observational projection and luminosity-weighting effects. We find wide variance in stellar population gradients between galaxies of similar mass, with typical gradients agreeing with observed galaxies. We show that, at fixed mass, the fraction of stars born in-situ within galaxies is correlated with the metallicity gradient in the halo, confirming that stellar halos contain unique information about the build-up and merger histories of galaxies.

  4. Asteroseismic stellar activity relations

    CERN Document Server

    Bonanno, A; Karoff, C

    2014-01-01

    In asteroseismology an important diagnostic of the evolutionary status of a star is the small frequency separation which is sensitive to the gradient of the mean molecular weight in the stellar interior. It is thus interesting to discuss the classical age-activity relations in terms of this quantity. Moreover, as the photospheric magnetic field tends to suppress the amplitudes of acoustic oscillations, it is important to quantify the importance of this effect by considering various activity indicators. We propose a new class of age-activity relations that connects the Mt. Wilson $S$ index and the average scatter in the light curve with the small frequency separation and the amplitude of the p-mode oscillations. We used a Bayesian inference to compute the posterior probability of various empirical laws for a sample of 19 solar-like active stars observed by the Kepler telescope. We demonstrate the presence of a clear correlation between the Mt. Wilson $S$ index and the relative age of the stars as indicated by ...

  5. Stellarator helical vacuum vessel

    International Nuclear Information System (INIS)

    A design study of a stainless steel, heavy wall, helically shaped vacuum torus has been made for use in a proposed Stellarator configuration. The study concerns itself with the shape of the vacuum vessel and the division of the vessel into components that can be machined and welded together into a helical configuration. A complication in the design requires that a circular magnet coil be located at the minor toroidal axis and that this coil be embedded within the periphery of the vacuum vessel. The vacuum vessel has a minor toroidal axis diameter of 4 meters, a 68.6-cm shell diameter, and a 1.9-cm wall thickness. It twists about the minor toroidal axis twice in 3600C. (An n value of 2). It is proposed that the unit be made of cylindrical segments with the ends of the cylinders cut at appropriate lengths and angles to form the helix. A mathematical derivation of the dimensions necessary to produce the required shapes of the segments has been made. Also, drawings of the vacuum vessel components have been produced on LANL's CTR CAD/CAM system. The procedure developed can be used for any value of n as dictated by physics requirements

  6. Stellar Presentations (Abstract)

    Science.gov (United States)

    Young, D.

    2015-12-01

    (Abstract only) The AAVSO is in the process of expanding its education, outreach and speakers bureau program. powerpoint presentations prepared for specific target audiences such as AAVSO members, educators, students, the general public, and Science Olympiad teams, coaches, event supervisors, and state directors will be available online for members to use. The presentations range from specific and general content relating to stellar evolution and variable stars to specific activities for a workshop environment. A presentation—even with a general topic—that works for high school students will not work for educators, Science Olympiad teams, or the general public. Each audience is unique and requires a different approach. The current environment necessitates presentations that are captivating for a younger generation that is embedded in a highly visual and sound-bite world of social media, twitter and U-Tube, and mobile devices. For educators, presentations and workshops for themselves and their students must support the Next Generation Science Standards (NGSS), the Common Core Content Standards, and the Science Technology, Engineering and Mathematics (STEM) initiative. Current best practices for developing relevant and engaging powerpoint presentations to deliver information to a variety of targeted audiences will be presented along with several examples.

  7. Stellar processes near AGN

    CERN Document Server

    Nayakshin, S

    2007-01-01

    Precise mechanisms by which Active Galactic Nuclei (AGN) receive their gaseous fuel is still a mystery. Here I draw attention to the extra ordinary star formation event that took place in the central ~ 0.5 parsec of our Galaxy. The most reliable explanation of the event seems to be that two somewhat massive nearly co-eval gaseous disks failed to accrete on Sgr A*, the super-massive black hole (SMBH) in our Galaxy, and instead cooled down and gravitationally collapsed, forming the stars observed now. This emphasises that star formation must be an important part of AGN feeding puzzle. I also discuss a model in which stellar winds create the observed obscuration of AGN. These winds are cold, clumpy and dusty, as required by the observations, but they are Compton-thin unless wind outflow rate is highly super-Eddington. This argument is in fact a general one, independent of the wind driving mechanism. I thus suggest that winds may be important for optically thin absorbers, and that a better model for optically thi...

  8. Evolution of stellar systems

    International Nuclear Information System (INIS)

    The stellar systems of which the evolution will be considered in this thesis, are either galaxies, which contain about 1011 stars, or binary systems, which consist of only two stars. It is seen that binary systems can give us some insight into the relative age of the nucleus of M31. The positive correlation between the metal content of a galaxy and its mass, first noted for elliptical galaxies, seems to be a general property of galaxies of all types. The observed increase of metallicity with galaxy mass is too large to be accounted for by differences in the evolutionary stage of galaxies. To explain the observed correlation it is proposed that a relatively larger proportion of massive stars is formed in more massive galaxies. The physical basis is that the formation of massive stars seems to be tied to the enhanced gas-dynamical activity in more massive galaxies. A specific aspect of the production of heavy elements by massive stars is investigated in some detail. In 1979 a cluster of 18 point X-ray sources within 400 pc of the centre of M31 was detected with the Einstein satellite. This is a remarkable result since no equivalent of this cluster has been observed in the nucleus of our own Galaxy, which otherwise is very similar to that of M31. An explanation for this phenomenon is proposed, suggesting that X-ray binaries are the products of the long-term evolution of nova systems. (Auth.)

  9. Stellar duplicity and nucleosynthesis

    Science.gov (United States)

    Izzard, Rob

    2014-09-01

    Half or more of all stars more massive than our Sun are orbited by one (or more) companion stars. Many companions are close enough that the evolution of both stars is greatly altered by the transfer of mass and angular momentum from one star to the other. Such mass transfer is highly likely during the late stages of evolution, such as on the giant branches, which are quite coincidentally also when stars undergo interesting nucleosynthesis. Direct mass transfer truncates the (A)GB prematurely compared to single stars and the ensuing stellar envelope is ejected perhaps to form a (chemically peculiar?) planetary nebula. In wider binaries, where one star has captured material from a long-dead companion, we can probe the nucleosynthesis that happened in ancient stars as well as fundamental astrophysical phenomena like wind accretion and circumbinary disc formation. I will focus on recent quantitative work on nucleosynthesis in mass-transfer systems, such as carbon-enhanced metal-poor and barium stars, and highlight some of the key open questions - and opportunities - that will dominate the next decade of duplicitous nucleosynthesis.

  10. Observation and Prediction of Runaway Electrons in the COMPASS Tokamak

    Czech Academy of Sciences Publication Activity Database

    Papřok, R.; Krlín, Ladislav; Stöckel, Jan

    Vol. 2. Prague : MATFYZPRESS, 2013 - (Šafránková, J.; Pavlů, J.), s. 60-66 ISBN 978-80-7378-251-1. - (WDS). [Annual Conference of Doctoral Students – WDS 2013 /22./. Praha (CZ), 04.06.2013-07.06.2013] R&D Projects: GA MŠk 7G10072; GA MŠk LA08048 Grant ostatní: EURATOM(XE) FU07-CT-2007-00060 Institutional research plan: CEZ:AV0Z20430508 Keywords : tokamak * COMPASS Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/proc/pdf13/WDS13_209_f2_Paprok.pdf

  11. Magnetic Diagnostics for Start-up Phase of COMPASS

    Czech Academy of Sciences Publication Activity Database

    Havlíček, Josef; Horáček, Jan; Weinzettl, Vladimír; Hronová-Bilyková, Olena; Naydenkova, Diana; Zajac, Jaromír

    Vol. 2. Prague: MATFYZPRESS, Prague, 2009 - (Šafránková, J.; Pavlů, J.), s. 148-152 ISBN 978-80-7378-102-6. [Annual conference of doctoral students - WDS 2009 /18./. Prague (CZ), 02.06.2009-05.06.2009] R&D Projects: GA ČR GD202/08/H057; GA ČR GA202/07/0044; GA MŠk 7G09042 Institutional research plan: CEZ:AV0Z20430508 Keywords : tokamak * magnetic field * COMPASS * magnetic diagnostics Subject RIV: BL - Plasma and Gas Discharge Physics http://www.mff.cuni.cz/veda/konference/wds/contents/pdf09/WDS09_225_f2_Havlicek.pdf

  12. Overview of Spin physics at HERMES and COMPASS

    Science.gov (United States)

    Contalbrigo, Marco

    2013-10-01

    The investigation of the partonic degrees of freedom beyond collinear approximation (3D description) has been gained increasing interest in the last decade. At the HERMES and COMPASS deep-inelastic-scattering experiment, several first measurements has been made which provide new insights on peculiar aspects of the parton dynamics within the nucleon or during fragmentation, i.e. related to spin-orbits effects. Complementary information has been gathered from spin-asymmetries in inclusive, semi-inclusive and exclusive channels. The two experiments feature a complementary energy regime, different beam and target set-ups and hadron identification in the final state to access flavor sensitivity. A compendium of the most interesting results will be presented.

  13. First results from EBW emission diagnostics on COMPASS

    Energy Technology Data Exchange (ETDEWEB)

    Zajac, J.; Preinhaelter, J.; Aftanas, M.; Bilkova, P.; Boehm, P.; Fuchs, V.; Weinzettl, V.; Zacek, F. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Prague (Czech Republic); Urban, J. [Institute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR, Prague (Czech Republic); CEA, IRFM, F-13108 Saint Paul-lez-Durance (France); Nanobashvili, S. [Andronikashvili Institute of Physics, Tamarashvili St. 6, 0177 Tbilisi (Georgia)

    2012-10-15

    COMPASS tokamak shots at low magnetic field feature overdense plasmas during the extended current flat-top phase. The first harmonic of the electron cyclotron emission is completely cutoff for O and X modes and so the emission caused by electron Bernstein waves (EBWs) propagating obliquely with respect to the magnetic field and undergoing so called EBW-X-O conversion process can be observed. We perform an angular scan of the EBW emission during a set of comparable shots in order to determine the optimum antenna direction. A weak dependence of the radiative temperature on the antenna angles indicates an influence of multiple reflections from the vessel wall. The low temperature at the mode conversion region is responsible for the collisional damping of EBW, which can explain several times lower measured radiative temperature than the electron temperature measured by the Thomson scattering system.

  14. Optical telescopes for COMPASS RICH1 up-grade

    CERN Document Server

    Sulc, M; Alekseev, M; Angerer, H; Appolonio, M; Birsa, R; Bordalo, P; Bradamante, F; Bressan, A; Busso, L; Chiosso, V M; Ciliberti, P; Colantoni, M L; Costa, S; Dibiase, N; Dafni, T; Dalla Torre, S; Diaz, V; Duic, V; Delagnes, E; Deschamps, H; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Finger, M Jr; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; von Harrach, D; Heinsius, F H; Joosten, R; Ketzer, B; Königsmann, K; Kolosov, V N; Konorov, I; Kramer, D; Kunne, F; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nähle, O; Neyret, D; Nerling, F; Pagano, P; Paul, S; Panebianco, S; Panzieri, D; Pesaro, G; Pizzolotto, C; Polak, J; Rebourgeard, P; Rocco, E; Robinet, F; Schiavon, P; Schill, C; Schoenmeier, P; Silva, L; Slunecka, M; Steiger, L; Sozzi, F; Svec, M; Tessarotto, F; Teufel, A; Wollny, H

    2006-01-01

    The central photon detection area of the Ring Imaging Cherenkov detector at COMPASS, a particle physics experiment at CERN SPS dedicated to hadron physics, has been upgraded from the previous system formed by wire chambers with CsI layers to a very fast UV extended multi anode photo multiplier tube array (MAPMT), including 576 tubes. The active area covered by the MAPMTs is 7.3 times smaller than the one previously equipped with CsI photocathodes, so 576 optical concentrators transforming the image from the old system focal plane to the new photocathode plane were needed. The telescope system formed by two fused silica lenses was designed, produced and assembled. The first prismatic plano-convex field lens is placed in the focal plane of the RICH mirrors. The second condenser lens is off centered and tilted and has one aspherical surface. All lenses have antireflection coating.

  15. The COMPASS Setup for Physics with Hadron Beams

    CERN Document Server

    Abbon, Ph.; Akhunzyanov, R.; Alexandrov, Yu.; Alexeev, M.G.; Alexeev, G.D.; Amoroso, A.; Andrieux, V.; Anosov, V.; Austregesilo, A.; Badelek, B.; Balestra, F.; Barth, J.; Baum, G.; Beck, R.; Bedfer, Y.; Berlin, A.; Bernhard, J.; Bicker, K.; Bielert, E.R.; Bieling, J.; Birsa, R.; Bisplinghoff, J.; Bodlak, M.; Boer, M.; Bordalo, P.; Bradamante, F.; Braun, C.; Bressan, A.; Buchele, M.; Burtin, E.; Capozza, L.; Ciliberti, P.; Chiosso, M.; Chung, S.U.; Cicuttin, A.; Colantoni, M.; Cotte, D.; Crespo, M.L.; Curiel, Q.; Dafni, T.; Dalla Torre, S.; Dasgupta, S.S.; Dasgupta, S.; Denisov, O.Yu.; Desforge, D.; Dinkelbach, A.M.; Donskov, S.V.; Doshita, N.; Duic, V.; Dunnweber, W.; Durand, D.; Dziewiecki, M.; Efremov, A.; Elia, C.; Eversheim, P.D.; Eyrich, W.; Faessler, M.; Ferrero, A.; Finger, M.; M. Finger jr; Fischer, H.; Franco, C.; von Hohenesche, N. du Fresne; Friedrich, J.M.; Frolov, V.; Gatignon, L.; Gautheron, F.; Gavrichtchouk, O.P.; Gerassimov, S.; Geyer, R.; Giganon, A.; Gnesi, I.; Gobbo, B.; Goertz, S.; Gorzellik, M.; Grabmuller, S.; Grasso, A.; Gregori, M.; Grube, B.; Grussenmeyer, T.; Guskov, A.; Haas, F.; von Harrach, D.; Hahne, D.; Hashimoto, R.; Heinsius, F.H.; Herrmann, F.; Hinterberger, F.; Hoppner, Ch.; Horikawa, N.; d'Hose, N.; Huber, S.; Ishimoto, S.; Ivanov, A.; Ivanshin, Yu.; Iwata, T.; Jahn, R.; Jary, V.; Jasinski, P.; Jorg, P.; Joosten, R.; Kabuss, E.; Ketzer, B.; Khaustov, G.V.; Khokhlov, Yu. A.; Kisselev, Yu.; Klein, F.; Klimaszewski, K.; Koivuniemi, J.H.; Kolosov, V.N.; Kondo, K.; Konigsmann, K.; Konorov, I.; Konstantinov, V.F.; Kotzinian, A.M.; Kouznetsov, O.; Kramer, M.; Kroumchtein, Z.V.; Kuchinski, N.; Kuhn, R.; Kunne, F.; Kurek, K.; Kurjata, R.P.; Lednev, A.A.; Lehmann, A.; Levillain, M.; Levorato, S.; Lichtenstadt, J.; Maggiora, A.; Magnon, A.; Makke, N.; Mallot, G.K.; Marchand, C.; Marroncle, J.; Martin, A.; Marzec, J.; Matousek, J.; Matsuda, H.; Matsuda, T.; Menon, G.; Meshcheryakov, G.; Meyer, W.; Michigami, T.; Mikhailov, Yu. V.; Miyachi, Y.; Moinester, M.A.; Nagaytsev, A.; Nagel, T.; Nerling, F.; Neubert, S.; Neyret, D.; Nikolaenko, V.I.; Novy, J.; Nowak, W.D.; Nunes, Ana Sofia; Olshevsky, A.G.; Orlov, I.; Ostrick, M.; Panknin, R.; Panzieri, D.; Parsamyan, B.; Paul, S.; Pesaro, G.; Pesaro, V.; Peshekhonov, D.V.; Pires, C.; Platchkov, S.; Pochodzalla, J.; Polyakov, V.A.; Pretz, J.; Quaresma, M.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Reymond, J-M.; Rocco, E.; Rossiyskaya, N.S.; Rousse, J.Y.; Ryabchikov, D.I.; Rychter, A.; Samartsev, A.; Samoylenko, V.D.; Sandacz, A.; Sarkar, S.; Savin, I.A.; Sbrizzai, G.; Schiavon, P.; Schill, C.; Schluter, T.; Schmidt, K.; Schmieden, H.; Schonning, K.; Schopferer, S.; Schott, M.; Shevchenko, O.Yu.; Silva, L.; Sinha, L.; Sirtl, S.; Slunecka, M.; Sosio, S.; Sozzi, F.; Srnka, A.; Steiger, L.; Stolarski, M.; Sulc, M.; Sulej, R.; Suzuki, H.; Szabelski, A.; Szameitat, T.; Sznajder, P.; Takekawa, S.; Wolbeek, J. ter; Tessaro, S.; Tessarotto, F.; Thibaud, F.; Tskhay, V.; Uhl, S.; Uman, I.; Virius, M.; Wang, L.; Weisrock, T.; Weitzel, Q.; Wilfert, M.; Windmolders, R.; Wollny, H.; Zaremba, K.; Zavertyaev, M.; Zemlyanichkina, E.; Ziembicki, M.; Zink, A.

    2015-01-01

    The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. Making use of a large part of the apparatus that was previously built for spin structure studies with a muon beam, it also features a new target system as well as new or upgraded detectors. The hadron setup is able to operate at the high incident hadron flux available at CERN. It is characterised by large angular and momentum coverages, large and nearly flat acceptances, and good two and three-particle mass resolutions. In 2008 and 2009 it was successfully used with positive and negative hadron beams and with liquid hydrogen and solid nuclear targets. This article describes the new and upgraded detectors and auxiliary equipment, outlines the reconstruction procedures used, and summarises the general performance of the setup.

  16. Compass & Vernier Type Models in Indo Archaeology: Engineering Heritage

    Science.gov (United States)

    Bhattacharya, Deepak

    2015-09-01

    Two extant, dated, verifiable archaeological members are adduced to have radial type compass features, having scope for fractionation of angles (θ operators) in a constant manner with lookout facilities. The Archaeological Survey of India celebrates their apex achievements in the domain of engineering/survey devices of erstwhile societies. Possible correlation has been drawn between the representatives of the elusive Gola yantra and the Vikhyana yantra (circular instrument & looking device) as referred in Indian history and culture. Dadhi nauti (curd level) has been explained for the first time. Now, all of these are accessible to everyone. This work is the first time report, which relates to historical archaeology of lower date c. 600 AD.

  17. Commissioning of heating neutral beams for COMPASS-D tokamak

    Energy Technology Data Exchange (ETDEWEB)

    Deichuli, P.; Davydenko, V.; Belov, V.; Gorbovsky, A.; Dranichnikov, A.; Ivanov, A.; Sorokin, A.; Mishagin, V.; Abdrashitov, A.; Kolmogorov, V.; Kondakov, A. [Budker Institute of Nuclear Physics, 630090 Novosibirsk (Russian Federation)

    2012-02-15

    Two neutral beam injectors have been developed for plasma heating on COMPASS-D tokamak (Institute of Plasma Physics, Prague). The 4-electrodes multihole ion-optical system with beam focusing was chosen to provide the low divergence 300 kW power in both deuterium and hydrogen atoms. The accelerating voltage is 40 kV at extracted ion current up to 15 A. The power supply system provides the continuous and modulated mode of the beam injection at a maximal pulse length 300 ms. The optimal arrangement of the cryopanels and the beam duct elements provides sufficiently short-length beamline which reduces the beam losses. The evolution of the impurities and molecular fraction content is studied in the process of the high voltage conditioning of the newly made ion sources. Two injectors of the same type have been successfully tested and are ready for operation at tokamak in IPP, Prague.

  18. Beyond Empathy: The Tree of Compassion With Malevolent Ego States.

    Science.gov (United States)

    Frederick, Claire

    2016-04-01

    Therapy with seriously dissociated patients requires the transformation and integration of malevolent ego states that produce a wide assortment of negative experiences and behaviors in the patient. During the course of therapy, they can present dangers to both patient and therapist, as well as to the therapeutic process (Watkins & Watkins, 1984). Perhaps the greatest challenges for therapists in this work are the development and the maintenance of empathy for these personality aspects. Without some degree of empathy, a healing therapeutic alliance cannot be formed, and absent a secure, healing, intersubjective experience, it is unlikely that malevolent ego states can undergo sufficient transformation for integration. Essential elements for developing and sustaining both the necessary empathy and the compassion, the altruistic activity that empathy engenders, are presented. PMID:27003483

  19. Monitoring of absolute mirror alignment at COMPASS RICH-1 detector

    Energy Technology Data Exchange (ETDEWEB)

    Alexeev, M. [INFN, Sezione di Torino and University of East Piemonte, Alessandria (Italy); INFN, Sezione di Trieste and University of Bari, Bari (Italy); Birsa, R. [INFN, Sezione di Trieste, Trieste (Italy); Bradamante, F.; Bressan, A. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Chiosso, M. [INFN, Sezione di Torino and University of Torino, Torino (Italy); Ciliberti, P. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Dalla Torre, S. [INFN, Sezione di Trieste, Trieste (Italy); Denisov, O. [INFN, Sezione di Torino, Torino (Italy); Duic, V. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Ferrero, A. [INFN, Sezione di Torino and University of Torino, Torino (Italy); Finger, M.; Finger, M. [Charles University, Prague (Czech Republic); JINR, Dubna (Russian Federation); Gayde, J.Ch. [CERN, European Organization for Nuclear Research, Geneva (Switzerland); Giorgi, M. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Gobbo, B.; Levorato, S. [INFN, Sezione di Trieste, Trieste (Italy); Maggiora, A. [INFN, Sezione di Torino, Torino (Italy); Martin, A. [INFN, Sezione di Trieste and University of Trieste, Trieste (Italy); Menon, G. [INFN, Sezione di Trieste, Trieste (Italy); Panzieri, D. [INFN, Sezione di Torino and University of East Piemonte, Alessandria (Italy); and others

    2014-12-01

    The gaseous COMPASS RICH-1 detector uses two spherical mirror surfaces, segmented into 116 individual mirrors, to focus the Cherenkov photons onto the detector plane. Any mirror misalignment directly affects the detector resolution. The on-line Continuous Line Alignment and Monitoring (CLAM) photogrammetry-based method has been implemented to measure the alignment of individual mirrors which can be characterized by the center of curvature. The mirror wall reflects a regular grid of retroreflective strips placed inside the detector vessel. Then, the position of each mirror is determined from the image of the grid reflection. The images are collected by four cameras. Any small mirror misalignment results in changes of the grid lines’ positions in the image. The accuracy limits of the CLAM method were checked by laser interferometry and are below 0.1 mrad.

  20. Measurement of the charged pion polarizability at COMPASS

    International Nuclear Information System (INIS)

    The reaction π-+Z→π-+γ+Z in which a photon is produced by a beam pion scattering off a quasi-real photon of the Coulomb field of the target nucleus is identified experimentally by the tiny magnitude of the momentum transfer to the nucleus. This process gives access to the charged pion polarizabilities απ and βπ whose experimental determination constitutes an important test of Chiral Perturbation Theory. In this work, the pion polarizability is obtained as απ=(1.9±0.7stat.±0.8syst.) x 10-4 fm3 from data taken with 190 GeV/c hadron beam provided by SPS to the COMPASS experiment at CERN in November 2009 and under the assumption of απ+βπ=0.

  1. Quantum phase transitions in spin-1 compass chains

    Science.gov (United States)

    Liu, Guang-Hua; Kong, Long-Juan; You, Wen-Long

    2015-11-01

    The ground-state phase diagram and quantum phase transitions (QPTs) in a spin-1 compass chain are investigated by the infinite time-evolving block decimation (iTEBD) method. Various phases are discerned by energy densities, spin correlations and entanglement entropy. A generalized string correlator is found to be capable of describing the nonlocal string order in the disordered phase. Furthermore, in the noncritical disordered phase, the spin-spin correlations are found to decay exponentially. Except for a multicritical point ( J 1 = 0, J 2 = 0), the QPTs are determined to have second-order characters. In addition, the central charges on these critical phase boundaries are determined to be c = 1 / 2, therefore these QPTs belong to the Ising universality class.

  2. Plans for a measurement of pion polarizabilities at COMPASS

    International Nuclear Information System (INIS)

    The pion electromagnetic structure can be probed in π-+(A,Z)→π-+(A,Z)+γ Compton scattering in inverse kinematics (Primakoff reaction) and described by the electric (απ) and the magnetic (βπ) polarizabilities that depend on the rigidity of pion's internal structure as a composite particle. Values for pion polarizabilities can be extracted from the comparison of the differential cross section for scattering of point-like pions with the measured cross section. The opportunity to measure pion polarizability via the Primakoff reaction at the COMPASS experiment was studied with a π- beam of 190 GeV. The obtained results are used for preparation of the new measurement.

  3. Measurement of the charged pion polarizability at COMPASS

    Energy Technology Data Exchange (ETDEWEB)

    Nagel, Thiemo Christian Ingo

    2012-09-26

    The reaction {pi}{sup -}+Z{yields}{pi}{sup -}+{gamma}+Z in which a photon is produced by a beam pion scattering off a quasi-real photon of the Coulomb field of the target nucleus is identified experimentally by the tiny magnitude of the momentum transfer to the nucleus. This process gives access to the charged pion polarizabilities {alpha}{sub {pi}} and {beta}{sub {pi}} whose experimental determination constitutes an important test of Chiral Perturbation Theory. In this work, the pion polarizability is obtained as {alpha}{sub {pi}}=(1.9{+-}0.7{sub stat.}{+-}0.8{sub syst.}) x 10{sup -4} fm{sup 3} from data taken with 190 GeV/c hadron beam provided by SPS to the COMPASS experiment at CERN in November 2009 and under the assumption of {alpha}{sub {pi}}+{beta}{sub {pi}}=0.

  4. Results and perspective on TMDs and GPDs at COMPASS

    Directory of Open Access Journals (Sweden)

    d'Hose Nicole

    2014-06-01

    Full Text Available COMPASS is a fixed target experiment at the CERN SPS dedicated to the study of the nucleon structure in the framework of the most complete descriptions based on transverse momentum dependent parton distribution functions (TMDs and generalised parton distributions (GPDs. TMDs have been accessed so far with semi-inclusive deep inelastic reactions using a 160 GeV muon beam off transversely polarized targets and they will be further investigated with Drell-Yan reactions using a 190 GeV pion beam off a transversely polarized proton target. GPDs will be studied with deeply virtual Compton scattering and hard exclusive meson production using muon beams. A selection of the results as well as the projections for the future program are discussed.

  5. The COMPASS setup for physics with hadron beams

    Science.gov (United States)

    Abbon, P.; Adolph, C.; Akhunzyanov, R.; Alexandrov, Yu.; Alexeev, M. G.; Alexeev, G. D.; Amoroso, A.; Andrieux, V.; Anosov, V.; Austregesilo, A.; Badełek, B.; Balestra, F.; Barth, J.; Baum, G.; Beck, R.; Bedfer, Y.; Berlin, A.; Bernhard, J.; Bicker, K.; Bielert, E. R.; Bieling, J.; Birsa, R.; Bisplinghoff, J.; Bodlak, M.; Boer, M.; Bordalo, P.; Bradamante, F.; Braun, C.; Bressan, A.; Büchele, M.; Burtin, E.; Capozza, L.; Ciliberti, P.; Chiosso, M.; Chung, S. U.; Cicuttin, A.; Colantoni, M.; Cotte, D.; Crespo, M. L.; Curiel, Q.; Dafni, T.; Dalla Torre, S.; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Yu.; Desforge, D.; Dinkelbach, A. M.; Donskov, S. V.; Doshita, N.; Duic, V.; Dünnweber, W.; Durand, D.; Dziewiecki, M.; Efremov, A.; Elia, C.; Eversheim, P. D.; Eyrich, W.; Faessler, M.; Ferrero, A.; Finger, M.; Finger, M.; Fischer, H.; Franco, C.; du Fresne von Hohenesche, N.; Friedrich, J. M.; Frolov, V.; Gatignon, L.; Gautheron, F.; Gavrichtchouk, O. P.; Gerassimov, S.; Geyer, R.; Giganon, A.; Gnesi, I.; Gobbo, B.; Goertz, S.; Gorzellik, M.; Grabmüller, S.; Grasso, A.; Gregori, M.; Grube, B.; Grussenmeyer, T.; Guskov, A.; Haas, F.; von Harrach, D.; Hahne, D.; Hashimoto, R.; Heinsius, F. H.; Herrmann, F.; Hinterberger, F.; Höppner, Ch.; Horikawa, N.; d`Hose, N.; Huber, S.; Ishimoto, S.; Ivanov, A.; Ivanshin, Yu.; Iwata, T.; Jahn, R.; Jary, V.; Jasinski, P.; Jörg, P.; Joosten, R.; Kabuß, E.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Yu. A.; Kisselev, Yu.; Klein, F.; Klimaszewski, K.; Koivuniemi, J. H.; Kolosov, V. N.; Kondo, K.; Königsmann, K.; Konorov, I.; Konstantinov, V. F.; Kotzinian, A. M.; Kouznetsov, O.; Krämer, M.; Kroumchtein, Z. V.; Kuchinski, N.; Kuhn, R.; Kunne, F.; Kurek, K.; Kurjata, R. P.; Lednev, A. A.; Lehmann, A.; Levillain, M.; Levorato, S.; Lichtenstadt, J.; Maggiora, A.; Magnon, A.; Makke, N.; Mallot, G. K.; Marchand, C.; Marroncle, J.; Martin, A.; Marzec, J.; Matousek, J.; Matsuda, H.; Matsuda, T.; Menon, G.; Meshcheryakov, G.; Meyer, W.; Michigami, T.; Mikhailov, Yu. V.; Miyachi, Y.; Moinester, M. A.; Nagaytsev, A.; Nagel, T.; Nerling, F.; Neubert, S.; Neyret, D.; Nikolaenko, V. I.; Novy, J.; Nowak, W.-D.; Nunes, A. S.; Olshevsky, A. G.; Orlov, I.; Ostrick, M.; Panknin, R.; Panzieri, D.; Parsamyan, B.; Paul, S.; Pesaro, G.; Pesaro, V.; Peshekhonov, D. V.; Pires, C.; Platchkov, S.; Pochodzalla, J.; Polyakov, V. A.; Pretz, J.; Quaresma, M.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Reymond, J.-M.; Rocco, E.; Rossiyskaya, N. S.; Rousse, J.-Y.; Ryabchikov, D. I.; Rychter, A.; Samartsev, A.; Samoylenko, V. D.; Sandacz, A.; Sarkar, S.; Savin, I. A.; Sbrizzai, G.; Schiavon, P.; Schill, C.; Schlüter, T.; Schmidt, K.; Schmieden, H.; Schönning, K.; Schopferer, S.; Schott, M.; Shevchenko, O. Yu.; Silva, L.; Sinha, L.; Sirtl, S.; Slunecka, M.; Sosio, S.; Sozzi, F.; Srnka, A.; Steiger, L.; Stolarski, M.; Sulc, M.; Sulej, R.; Suzuki, H.; Szabelski, A.; Szameitat, T.; Sznajder, P.; Takekawa, S.; Terça, G.; Wolbeek, J. ter; Tessaro, S.; Tessarotto, F.; Thibaud, F.; Tskhay, V.; Uhl, S.; Uman, I.; Virius, M.; Wang, L.; Weisrock, T.; Weitzel, Q.; Wilfert, M.; Windmolders, R.; Wollny, H.; Zaremba, K.; Zavertyaev, M.; Zemlyanichkina, E.; Ziembicki, M.; Zink, A.

    2015-04-01

    The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. Making use of a large part of the apparatus that was previously built for spin structure studies with a muon beam, it also features a new target system as well as new or upgraded detectors. The hadron setup is able to operate at the high incident hadron flux available at CERN. It is characterised by large angular and momentum coverages, large and nearly flat acceptances, and good two and three-particle mass resolutions. In 2008 and 2009 it was successfully used with positive and negative hadron beams and with liquid hydrogen and solid nuclear targets. This paper describes the new and upgraded detectors and auxiliary equipment, outlines the reconstruction procedures used, and summarises the general performance of the setup.

  6. The Gathering Problem for Two Oblivious Robots with Unreliable Compasses

    CERN Document Server

    Izumi, Taisuke; Katayama, Yoshiaki; Inuzuka, Nobuhiro; Défago, Xavier; Wada, Koichi; Yamashita, Masafumi

    2011-01-01

    Anonymous mobile robots are often classified into synchronous, semi-synchronous and asynchronous robots when discussing the pattern formation problem. For semi-synchronous robots, all patterns formable with memory are also formable without memory, with the single exception of forming a point (i.e., the gathering) by two robots. However, the gathering problem for two semi-synchronous robots without memory is trivially solvable when their local coordinate systems are consistent, and the impossibility proof essentially uses the inconsistencies in their coordinate systems. Motivated by this, this paper investigates the magnitude of consistency between the local coordinate systems necessary and sufficient to solve the gathering problem for two oblivious robots under semi-synchronous and asynchronous models. To discuss the magnitude of consistency, we assume that each robot is equipped with an unreliable compass, the bearings of which may deviate from an absolute reference direction, and that the local coordinate s...

  7. The COMPASS setup for physics with hadron beams

    International Nuclear Information System (INIS)

    The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This setup was designed to perform exclusive measurements of processes with several charged and/or neutral particles in the final state. Making use of a large part of the apparatus that was previously built for spin structure studies with a muon beam, it also features a new target system as well as new or upgraded detectors. The hadron setup is able to operate at the high incident hadron flux available at CERN. It is characterised by large angular and momentum coverages, large and nearly flat acceptances, and good two and three-particle mass resolutions. In 2008 and 2009 it was successfully used with positive and negative hadron beams and with liquid hydrogen and solid nuclear targets. This paper describes the new and upgraded detectors and auxiliary equipment, outlines the reconstruction procedures used, and summarises the general performance of the setup

  8. Double spin asymmetry in exclusive $\\rho^0$ muoproduction at COMPASS

    CERN Document Server

    Alexakhin, V Yu; Alexandrov, Yu A; Alexeev, G D; Amoroso, A; Arbuzov, A; Badelek, B; Balestra, F; Ball, J; Baum, G; Barth, J; Bedfer, Y; Bernet, C; Bertini, R; Bettinelli, M; Birsa, R; Bisplinghoff, J; Bordalo, P; Bradamante, Franco; Bravar, A; Bressan, A; Brona, G; Burtin, E; Bussa, M P; Chapiro, A; Chiosso, M; Cicuttin, A; Colantoni, M L; Costa, S; Crespo, M L; D'Hose, N; Dalla Torre, S; Das, S; Das-Gupta, S S; De Masi, R; Dedek, N; Denisov, O Yu; Dhara, L; Díaz, V; Dinkelbach, A M; Donskov, S V; Dorofeev, V A; Doshita, N; Duic, V; Dünnweber, W; Eversheim, P D; Eyrich, W; Fabro, M; Faessler, M; Falaleev, V; Ferrero, A; Ferrero, L; Finger, M; Finger, M Jr; Fischer, H; Franco, C; Franz, J; Friedrich, J M; Frolov, V; Garfagnini, R; Gautheron, F; Gavrichtchouk, O P; Gazda, R; Gerassimov, S G; Geyer, R; Giorgi, M; Gobbo, B; Görtz, S; Gorin, A M; Grabmuller, S; Grajek, O A; Grasso, A; Grube, B; Gushterski, R; Guskov, A; Haas, F; Hannappel, J; Von Harrach, D; Hasegawa, T; Heckmann, J; Hedicke, S; Heinsius, F H; Hermann, R; Hess, C; Hinterberger, F; Von Hodenberg, M; Horikawa, N; Horikawa, S; Ilgner, C; Ioukaev, A I; Ishimoto, S; Ivanov, O; Ivanshin, Yu; Iwata, T; Jahn, R; Janata, A; Jasinski, P; Joosten, R; Jouravlev, N I; Kabuss, E M; Kang, D; Ketzer, B; Khaustov, G V; Khokhlov, Yu A; Kisselev, Yu; Klein, F; Klimaszewski, K; Koblitz, S; Koivuniemi, J H; Kolosov, V N; Komissarov, E V; Kondo, K; Knigsmann, K; Konorov, I; Konstantinov, V F; Korentchenko, A S; Korzenev, A; Kotzinian, A M; Koutchinski, N A; Kuznetsov, O; Kravchuk, N P; Kral, A; Kroumchtein, Z V; Kühn, R; Kunne, Fabienne; Kurek, K; Ladygin, M E; Lamanna, M; Le Goff, J M; Lednev, A A; Lehmann, A; Lichtenstadt, J; Liska, T; Ludwig, I; Maggiora, A; Maggiora, M; Magnon, A; Mallot, G K; Mann, A; Marchand, C; Marroncle, J; Martin, A; Marzec, J; Massmann, F; Matsuda, T; Maksimov, A N; Meyer, W; Mielech, A; Mikhailov, Yu V; Moinester, M A; Mutter, A; Nahle, O; Nagaytsev, A; Nagel, T; Nassalski, J P; Neliba, S; Nerling, F; Neubert, a S; Neyret, D P; Nikolaenko, V I; Nikolaev, K; Olshevskii, A G; Ostrick, M; Padee, A; Pagano, P; Panebianco, S; Panknin, R; Panzieri, D; Paul, S; Pawlukiewicz-Kaminska, B; Peshekhonov, V D; Piragino, G; Platchkov, S; Pochodzalla, J; Polak, J; Polyakov, V A; Pretz, J; Procureur, S; Quintans, C; Rajotte, J F; Rapatsky, V; Ramos, S; Reicherz, G; Richter, A; Robinet, F; Rocco, E; Rondio, E; Rozhdestvensky, A M; Ryabchikov, D I; Samoylenko, V D; Sandacz, A; Santos, H; Sapozhnikov, M G; Sarkar, S; Savin, I A; Schiavon, Paolo; Schill, C; Schmitt, L; Schonmeier, P; Schroder, W; Shevchenko, O Yu; Siebert, H W; Silva, L; Sinha, L; Sissakian, A N; Slunecka, M; Smirnov, G I; Sosio, S; Sozzi, F; Sugonyaev, V P; Srnka, A; Stinzing, F; Stolarski, M; Sulc, M; Sulej, R; Takabayashi, N; Tchalishev, V V; Tessaro, S; Tessarotto, F; Teufel, A; Tkatchev, L G; Venugopal, G; Virius, M; Vlassov, N V; Vossen, A; Webb, R; Weise, E; Weitzel, Q; Windmolders, R; Wirth, S; Wilicki, W; Zaremba, s K; Zavertyaev, M; Zemlyanichkina, E; Zhao, J; Ziegler, R; Zvyagin, A

    2007-01-01

    The longitudinal double spin asymmetry A_1^rho for exclusive leptoproduction of rho^0 mesons, mu + N -> mu + N + rho, is studied using the COMPASS 2002 and 2003 data. The measured reaction is incoherent exclusive rho^0 production on polarised deuterons. The Q^2 and x dependence of A_1^rho is presented in a wide kinematical range: 3x10^-3 < Q^2 < 7 (GeV/c)^2 and 5x10^-5 < x < 0.05. The presented results are the first measurements of A_1^rho at small Q2 (Q2 < 0.1 (GeV/c)^2) and small x (x < 3x10^-3). The asymmetry is in general compatible with zero in the whole kinematical range.

  9. Model Runs (COMPASS model of juvenile passage through the Snake and Columbia River hydrosystem)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Comprehensive Passage (COMPASS) model was developed by the Northwest Fisheries Science Center (NWFSC) in collaboration with scientists from other federal...

  10. Antennal circadian clocks coordinate sun compass orientation in migratory monarch butterflies.

    Science.gov (United States)

    Merlin, Christine; Gegear, Robert J; Reppert, Steven M

    2009-09-25

    During their fall migration, Eastern North American monarch butterflies (Danaus plexippus) use a time-compensated Sun compass to aid navigation to their overwintering grounds in central Mexico. It has been assumed that the circadian clock that provides time compensation resides in the brain, although this assumption has never been examined directly. Here, we show that the antennae are necessary for proper time-compensated Sun compass orientation in migratory monarch butterflies, that antennal clocks exist in monarchs, and that they likely provide the primary timing mechanism for Sun compass orientation. These unexpected findings pose a novel function for the antennae and open a new line of investigation into clock-compass connections that may extend widely to other insects that use this orientation mechanism. PMID:19779201

  11. A Fast and High-Accuracy Compass Alignment Method to SINS with Azimuth Axis Rotation

    Directory of Open Access Journals (Sweden)

    Xixiang Liu

    2013-01-01

    Full Text Available Azimuth axis rotating modulation was introduced to improve the alignment accuracy of strapdown inertial navigation system (SINS through compass algorithm, in which the limit accuracy was determined by equivalent sensor errors in the eastern and northern direction. In this modulation, horizontal sensor errors were modulated into zero mean periodic variables. Furthermore, two methods were introduced to ensure alignment accuracy and speed: (1 shortened rotating cycle and redesigned compass parameters were selected to eliminate or ease the amplification to low-frequency senor error inputs in compass loop caused by rotation and (2 a data repeated calculation method was designed to shorten prolonged alignment time caused by the above redesigned parameters. Based on a certain SINS, turntable test proves that alignment accuracy and time were significantly improved and slightly shortened in comparison with the classical compass alignment.

  12. Transverse spin azimuthal asymmetries at COMPASS: SIDIS Multi-D analysis & Drell-Yan

    CERN Document Server

    Parsamyan, Bakur

    2015-01-01

    COMPASS is a high-energy physics experiment operating on the M2 beam line at the SPS at CERN. Using high energy muon and hadron beams the experiment covers broad range of physics aspects in the field of the hadron structure and spectroscopy. One of the important objectives of the COMPASS experiment is the exploration of transverse spin structure of the nucleon via study of spin (in)dependent azimuthal asymmetries with semi-inclusive deep inelastic scattering (SIDIS) processes and starting from 2014 also with Drell-Yan (DY) reactions. Experimental results obtained by COMPASS for azimuthal effects in SIDIS play an important role in the general understanding of the three-dimensional nature of the nucleon. Giving access to the entire "twist-2" set of transverse momentum dependent (TMD) parton distribution functions (PDFs) and fragmentation functions (FFs) COMPASS data trigger constant theoretical interest and are being widely used in phenomenological analyses and global data fits. In particular, recent unique x-$...

  13. Low temperature polarized target for spin structure studies of nucleons at COMPASS

    CERN Document Server

    Pesek, Michael

    In presented thesis we describe concept of Deep Inelastic Scattering of leptons on nucleons in context of nucleon spin structure studies. Both polarized and unpolarized cases are discussed and concept of Transverse Momentum Dependent Parton Distribution Functions (TMD PDF) is introduced. The possibility of TMDs measurement using Semi-inclusive DIS (SIDIS) is described along with related results from COMPASS experiment. The future Drell-Yan programme at COMPASS is briefly mentioned and its importance is presented on the universality test i.e. change of sign of T-odd TMDs when measured in Drell-Yan and SIDIS. The importance of Polarized Target (PT) for spin structure studies is highlighted and principles of Dynamic Nuclear Polarization (DNP) are given using both Solid effect and spin temperature concept. COMPASS experiment is described in many details with accent given to PT. Finally the thermal equilibrium (TE) calibration procedure is described and carried out for 2010 and 2011 physics runs at COMPASS. The av...

  14. Chandrasekhar and Modern Stellar Dynamics

    CERN Document Server

    Evans, N W

    2011-01-01

    Stellar dynamics occupied Chandrasekhar's interest for a brief interlude between his more prolonged studies of stellar structure and radiative transfer. This paper traces the history of one of his ideas -- namely, that the shape of the galactic potential controls the orientation of the stellar velocity dispersion tensor. It has its roots in papers by Eddington (1915) and Chandrasekhar (1939), and provoked a fascinating dispute between these two great scientists -- less well-known than their famous controversy over the white dwarf stars. In modern language, Eddington claimed that the integral curves of the eigenvectors of the velocity dispersion tensor provide a one-dimensional foliation into mutually orthogonal surfaces. Chandrasekhar challenged this, and explicitly constructed a counter-example. In fact, the work of neither of these great scientists was without flaws, though further developments in stellar dynamics were to ultimately draw more on Eddington's insight than Chandrasekhar's. We conclude with a d...

  15. Stellar dynamics and black holes

    Indian Academy of Sciences (India)

    David Merritt

    2011-07-01

    Chandrasekhar’s most important contribution to stellar dynamics was the concept of dynamical friction. I briefly review that work, then discuss some implications of Chandrasekhar’s theory of gravitational encounters for motion in galactic nuclei.

  16. The Impact of a Knitting Intervention on Compassion Fatigue in Oncology Nurses.

    Science.gov (United States)

    Anderson, Lyndsay W; Gustavson, Christina U

    2016-02-01

    Compassion fatigue is the emotional exhaustion and stress that nurses can feel when caring for terminally ill patients. This can contribute to high nursing turnover rates, result in poor job satisfaction, and lead to decreased ability to provide quality care. Oncology nurses are vulnerable to compassion fatigue because they develop relationships with patients battling life-threatening illnesses, provide end-of-life care, and encounter ethical dilemmas related to cancer treatment. 
. PMID:26800415

  17. Species of Compassion: Aesthetics, Anaesthetics, and Pain in the Physiological Laboratory

    Directory of Open Access Journals (Sweden)

    Rob Boddice

    2012-12-01

    Full Text Available This essay explores the interplay of different species of compassion with regard to physiological practices in the final decades of the nineteenth century. Drawing on the lexicon from which ideals of late-Victorian compassion were formed, it illustrates their contested nature, demonstrating how physiologists developed their own concepts of compassion based on the theories of Darwin and Spencer. Within this purview, the essay examines the historical specificity of antivivisectionist compassion as well as ways in which pain in the laboratory was conceptualized, experienced, and managed ethically. This article explores the interplay of different species of compassion with regard to physiological practices in the last quarter of the nineteenth century in Britain. The lexicographical web of late-Victorian compassion included ‘humanity’, ‘pity’, ‘commiseration’, ‘tenderness’ (or ‘tender sympathy’, and ‘sympathetic pain’, all of which projected contested ideals of both individual character and moral conduct. As well as showing the historical specificity of antivivisectionist compassion – a complex aesthetic of pain closely linked to disgust – the article will principally demonstrate that physiologists (and the community of evolutionary scientists in general were applying their own newly, but no less highly, developed form of compassion that emerged straight from the pages of Darwin and Spencer. There is a story here of pain awareness and pain imagination within physiology, specifically connected to feelings of ‘humanity’. In practice, this story centres on anaesthesia and its role in allowing physiologists to live up to an ideal of ‘imperturbability’. It includes an investigation into what physiologists thought about causing pain in animals, as well as analysis of what changed after the use of anaesthetics became widespread. The article inquires anew about the ways in which pain in the laboratory was conceptualized

  18. Compassion Fatigue is Similar in Emergency Medicine Residents Compared to other Medical and Surgical Specialties

    OpenAIRE

    Bellolio, M. Fernanda; Cabrera, Daniel; Sadosty, Annie T.; Hess, Erik P.; Campbell, Ronna L.; Lohse, Christine M.; Sunga, Kharmene L

    2014-01-01

    Introduction: Compassion fatigue (CF) is the emotional and physical burden felt by those helping others in distress, leading to a reduced capacity and interest in being empathetic towards future suffering. Emergency care providers are at an increased risk of CF secondary to their first responder roles and exposure to traumatic events. We aimed to investigate the current state of compassion fatigue among emergency medicine (EM) resident physicians, including an assessment of contributing facto...

  19. Compassion Fade : Affect and Charity Are Greatest for a Single Child in Need

    OpenAIRE

    Daniel Västfjäll; Paul Slovic; Marcus Mayorga; Ellen Peters

    2014-01-01

    Charitable giving in 2013 exceeded $300 billion, but why do we respond to some life-saving causes while ignoring others? In our first two studies, we demonstrated that valuation of lives is associated with affective feelings (self-reported and psychophysiological) and that a decline in compassion may begin with the second endangered life. In Study 3, this fading of compassion was reversed by describing multiple lives in a more unitary fashion. Study 4 extended our findings to loss-frame scena...

  20. Polarised Drell-Yan measurement in the COMPASS experiment at CERN

    OpenAIRE

    Quaresma, Márcia; COMPASS Collaboration

    2014-01-01

    The COMPASS experiment at CERN has been contributing to the description of the nucleon spin structure, namely the transverse momentum dependent parton distribution functions (TMDs), through the Semi-Inclusive Deep Inelastic Scattering (SIDIS) using a muon beam impinging on polarised targets. These TMD functions are also accessible via the transversely polarised Drell-Yan (DY) process, which will be studied in the next COMPASS data taking, starting this Autumn. This process, in which the proto...

  1. Integrated Data Acquisition, Storage, Retrieval and Processing Using the COMPASS DataBase (CDB)

    OpenAIRE

    Urban, J.; Pipek, J.; Hron, M.; Janky, F.; Papřok, R.; Peterka, M; Duarte, A. S.

    2014-01-01

    We present a complex data handling system for the COMPASS tokamak, operated by IPP ASCR Prague, Czech Republic [1]. The system, called CDB (Compass DataBase), integrates different data sources as an assortment of data acquisition hardware and software from different vendors is used. Based on widely available open source technologies wherever possible, CDB is vendor and platform independent and it can be easily scaled and distributed. The data is directly stored and retrieved using a standard ...

  2. Discordant timing between antennae disrupts sun compass orientation in migratory monarch butterflies

    OpenAIRE

    Guerra, Patrick A; Merlin, Christine; Gegear, Robert J; Reppert, Steven M.

    2012-01-01

    To navigate during their long-distance migration, monarch butterflies (Danaus plexippus) use a time-compensated sun compass. The sun compass timing elements reside in light-entrained circadian clocks in the antennae. Here we show that either antenna is sufficient for proper time compensation. However, migrants with either antenna painted black (to block light entrainment) and the other painted clear (to permit light entrainment) display disoriented group flight. Remarkably, when the black-pai...

  3. Antennal circadian clocks coordinate sun compass orientation in migratory monarch butterflies#

    OpenAIRE

    Merlin, Christine; Gegear, Robert J; Reppert, Steven M.

    2009-01-01

    During their fall migration, Eastern North American monarch butterflies (Danaus plexippus) use a time-compensated sun compass to aid navigation to their overwintering grounds in central Mexico. It has been assumed that the circadian clock that provides time compensation resides in the brain, although this assumption has never been examined directly. Here we show that the antennae are necessary for proper time-compensated sun compass orientation in migratory monarch butterflies, that antennal ...

  4. A Fast and High-Accuracy Compass Alignment Method to SINS with Azimuth Axis Rotation

    OpenAIRE

    Xixiang Liu; Xiaosu Xu; Yiting Liu; Lihui Wang

    2013-01-01

    Azimuth axis rotating modulation was introduced to improve the alignment accuracy of strapdown inertial navigation system (SINS) through compass algorithm, in which the limit accuracy was determined by equivalent sensor errors in the eastern and northern direction. In this modulation, horizontal sensor errors were modulated into zero mean periodic variables. Furthermore, two methods were introduced to ensure alignment accuracy and speed: (1) shortened rotating cycle and redesigned compass par...

  5. Effect of Compassion Meditation on Neuroendocrine, Innate Immune and Behavioral Responses to Psychosocial Stress

    OpenAIRE

    Pace, Thaddeus W. W.; Negi, Lobsang Tenzin; Adame, Daniel D.; Cole, Steven P.; Sivilli, Teresa I.; Brown, Timothy D.; Issa, Michael J.; Raison, Charles L.

    2008-01-01

    Meditation practices may impact physiological pathways that are modulated by stress and relevant to disease. While much attention has been paid to meditation practices that emphasize calming the mind, improving focused attention, or developing mindfulness, less is known about meditation practices that foster compassion. Accordingly, the current study examined the effect of compassion meditation on innate immune, neuroendocrine and behavioral responses to psychosocial stress and evaluated the ...

  6. Self-compassion as a predictor of interleukin-6 response to acute psychosocial stress

    OpenAIRE

    Breines, Juliana G.; Thoma, Myriam V.; Gianferante, Danielle; Hanlin, Luke; Chen, Xuejie; Rohleder, Nicolas

    2013-01-01

    We examined the hypothesis that self-compassion is associated with lower levels of stress-induced inflammation. On two consecutive days, plasma concentrations of interleukin-6 (IL-6) were assessed at baseline and at 30 and 120 minutes following exposure to a standardized laboratory stressor in a sample of 41 healthy young adults. Participants who were higher in self-compassion exhibited significantly lower day 1 IL-6 responses, even when controlling for self-esteem, depressive symptoms, demog...

  7. Design and performance evaluation of a hall effect magnetic compass for oceanographic and meteorological applications

    Digital Repository Service at National Institute of Oceanography (India)

    Joseph, A.; Desai, R.G.P.; Agarvadekar, Y.; Tengali, T.; Mishra, M.; Fadate, C.; Gomes, L.

    agnetic compass for a given direction setting. This ant standard deviation to be estimated. However, each t-squares-fitted straight-line behavior and other perform ean of these twenty individual values corresponding to a give or readings... and the corresponding com espect of calibrations in the clockwise and counter-clockwise directions. Fig. 5 protractor readings and th ockwise and counter-clo 2005 Fig.3. View of Hall Effect magnetic compass located on the calibration device used for tilting...

  8. A Compassion-Focused Approach to Working With Someone Diagnosed With Schizophrenia.

    Science.gov (United States)

    Kennedy, Angela; Ellerby, Mark

    2016-02-01

    This case report is a shared, compassion-focused therapy account between a therapist and someone with a 20-year history of schizophrenia. It shows the usefulness of compassion in facilitating the courage to address the worst symptoms of psychosis. It does this by promoting a mindfulness of mind and emotional regulation. This approach helped create an alternative position from which to ground and anchor the self so psychotic fears were less able to dominate. PMID:26662840

  9. Community Project for Accelerator Science and Simulation (ComPASS) Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Cary, John R. [Tech-X Corporation, Boulder, CO (United States); Cowan, Benjamin M. [Tech-X Corporation, Boulder, CO (United States); Veitzer, S. A. [Tech-X Corporation, Boulder, CO (United States)

    2016-03-04

    Tech-X participated across the full range of ComPASS activities, with efforts in the Energy Frontier primarily through modeling of laser plasma accelerators and dielectric laser acceleration, in the Intensity Frontier primarily through electron cloud modeling, and in Uncertainty Quantification being applied to dielectric laser acceleration. In the following we present the progress and status of our activities for the entire period of the ComPASS project for the different areas of Energy Frontier, Intensity Frontier and Uncertainty Quantification.

  10. DEVELOPMENT OF AN AUDIT TOOL FOR PRODUCT INNOVATION: THE INNOVATION COMPASS

    OpenAIRE

    ZOE J. RADNOR; HANNAH NOKE

    2006-01-01

    This paper will present the development of an audit tool called the Innovation Compass. It will show how the tool was formulated through a research project, which was aiming to understand the innovation process within organisations. The creation of the Innovation Compass was driven by the research process and, as this paper will give an example of, validated through its application to case studies. The paper gives a greater understanding of the elements of the tool and, how it could be used a...

  11. Meditation and happiness: Mindfulness and self-compassion may mediate the meditation–happiness relationship

    OpenAIRE

    Campos Bacas, Daniel; Cebolla i Martí, Ausiàs Josep; Quero Castellano, Soledad; Bretón-López, Juana; Botella Arbona, Cristina; Soler Ribaudi, Joaquim; García Campayo, Javier; Demarzo, Marcelo; Baños Rivera, Rosa María

    2015-01-01

    Mindfulness and self-compassion are emerging as crucial constructs in mental health research. Recent studies have shown that both mindfulness and self-compassion skills may play important roles in well-being and positive emotions associated with mindfulness training. Studies are needed to explain this relationship and to determine what facets may be correlating and mediating the meditation–happiness relationship. The aim of this study was to explore the meditation–happiness relationship and e...

  12. Short-Term Compassion Training Increases Prosocial Behavior in a Newly Developed Prosocial Game

    OpenAIRE

    Leiberg, S.; Klimecki, O; Singer, T

    2011-01-01

    Compassion has been suggested to be a strong motivator for prosocial behavior. While research has demonstrated that compassion training has positive effects on mood and health, we do not know whether it also leads to increases in prosocial behavior. We addressed this question in two experiments. In Experiment 1, we introduce a new prosocial game, the Zurich Prosocial Game (ZPG), which allows for repeated, ecologically valid assessment of prosocial behavior and is sensitive to the influence of...

  13. Short-term compassion training increases prosocial behavior in a newly developed prosocial game

    OpenAIRE

    Leiberg, Susanne; Klimecki, Olga; Singer, Tania

    2011-01-01

    Compassion has been suggested to be a strong motivator for prosocial behavior. While research has demonstrated that compassion training has positive effects on mood and health, we do not know whether it also leads to increases in prosocial behavior. We addressed this question in two experiments. In Experiment 1, we introduce a new prosocial game, the Zurich Prosocial Game (ZPG), which allows for repeated, ecologically valid assessment of prosocial behavior and is sensitive to the influence of...

  14. Compassion Is a Necessity and an Individual and Collective Responsibility Comment on "Why and How Is Compassion Necessary to Provide Good Quality Healthcare?".

    Science.gov (United States)

    Lown, Beth A

    2015-09-01

    Compassion is a complex process that is innate, determined in part by individual traits, and modulated by a myriad of conscious and unconscious factors, immediate context, social structures and expectations, and organizational "culture." Compassion is an ethical foundation of healthcare and a widely shared value; it is not an optional luxury in the healing process. While the interrelations between individual motivation and social structure are complex, we can choose to act individually and collectively to remove barriers to the innate compassion that most healthcare professionals bring to their work. Doing so will reduce professional burnout, improve the well-being of the healthcare workforce, and facilitate our efforts to achieve the triple aim of improving patients' experiences of care and health while lowering costs. PMID:26340491

  15. Compassion Is a Necessity and an Individual and Collective Responsibility; Comment on “Why and How Is Compassion Necessary to Provide Good Quality Healthcare?”

    Directory of Open Access Journals (Sweden)

    Beth A. Lown

    2015-09-01

    Full Text Available Compassion is a complex process that is innate, determined in part by individual traits, and modulated by a myriad of conscious and unconscious factors, immediate context, social structures and expectations, and organizational “culture.” Compassion is an ethical foundation of healthcare and a widely shared value; it is not an optional luxury in the healing process. While the interrelations between individual motivation and social structure are complex, we can choose to act individually and collectively to remove barriers to the innate compassion that most healthcare professionals bring to their work. Doing so will reduce professional burnout, improve the well-being of the healthcare workforce, and facilitate our efforts to achieve the triple aim of improving patients’ experiences of care and health while lowering costs.

  16. Compass: clinical evaluation of a new instrument for the diagnosis of glaucoma.

    Directory of Open Access Journals (Sweden)

    Luca Rossetti

    Full Text Available To evaluate Compass, a new instrument for glaucoma screening and diagnosis that combines scanning ophthalmoscopy, automated perimetry, and eye tracking.A total of 320 human subjects (200 normal, 120 with glaucoma underwent full ophthalmological evaluation and perimetric evaluation using the Humphrey SITA standard 24° test (HFA, and the Compass test that consisted of a full-threshold program on the central 24° with a photograph of the central 30° of the retina. A subgroup of normal subjects and glaucoma patients underwent a second Compass test during the same day in order to study test-retest variability. After exclusion of 30 patients due to protocol rules, a database was created to compare the Compass to the HFA, and to evaluate retinal image quality and fixation stability.The difference in mean sensitivity between Compass and HFA was -1.02 ± 1.55 dB in normal subjects (p65% of cases; Image-based diagnosis was in accordance with the initial diagnosis in 85% of the subjects.Based on preliminary results, Compass showed useful diagnostic characteristics for the study of glaucoma, and combined morphological information with functional data.

  17. Stellar Diameters and Temperatures IV. Predicting Stellar Angular Diameters

    CERN Document Server

    Boyajian, Tabetha; von Braun, Kaspar

    2013-01-01

    The number of stellar angular diameter measurements has greatly increased over the past few years due to innovations and developments in the field of long baseline optical interferometry (LBOI). We use a collection of high-precision angular diameter measurements for nearby, main-sequence stars to develop empirical relations that allow the prediction of stellar angular sizes as a function of observed photometric color. These relations are presented for a combination of 48 broad-band color indices. We empirically show for the first time a dependence on metallicity to these relations using Johnson $(B-V)$ and Sloan $(g-r)$ colors. Our relations are capable of predicting diameters with a random error of less than 5% and represent the most robust and empirical determinations to stellar angular sizes to date.

  18. [Compassion as a mediator between stressful events and perceived stress in Greek students].

    Science.gov (United States)

    Tholouli, E; Maridaki-Kassotaki, A; Varvogli, L; Chrousos, G P

    2016-01-01

    Compassion is closely related with human's survival as a mammal and has been developed through evolution for pain reduction, for forming affiliative bonds and alliances with non kin in order to increase protection and cope with external threats. Compassion seems to influence people's ability to deal with life's adverse situations such as stress and it is linked with lower psychopathology and greater wellbeing. Compassion is closely related to empathy and altruism and it is defined as the recognition of the pain of the self or others' that is accompanied with the will to take action in order to relieve the person from pain. Its main features are kindness instead of self-judgment and indifference, the recognition of common humanity instead of the feeling of separation and mindfulness when facing adverse conditions instead of over-identification with one's pain or disengagement with the pain of others. According to the biopsychosocial approach, stress can be defined by three dimensions such as the cause or stressful factors that can be major life events or daily hassles, the perception of stress that is manifested through cognitive, emotional and behavioural reactions and the physiological response for achieving homeostasis. The purpose of the present study was to investigate the role of compassion for self and others in the occurrence of stressful events and levels of perceived stress in students. Participants were 280 undergraduate students from two Greek universities. Results indicated that students who had experienced a greater amount of stressful events during the past year reported having higher levels of perceived stress and that higher self-compassion was correlated with less perceived stress. Moreover, the adverse effect of stressful events on perceived stress was partially explained by the mediating role of self-compassion. Students who reported more stressful events showed higher compassion for others in opposition to compassion towards themselves but

  19. Compact Stellarator Path to DEMO

    Science.gov (United States)

    Lyon, J. F.

    2007-11-01

    Issues for a DEMO reactor are sustaining an ignited/high-Q plasma in steady state, avoiding disruptions and large variations in power flux to the wall, adequate confinement of thermal plasma and alpha-particles, control of a burning plasma, particle and power handling, etc. Compact stellarators have key advantages -- steady-state high-plasma-density operation without external current drive or disruptions, stability without a close conducting wall or active feedback systems, and low recirculating power -- in addition to moderate plasma aspect ratio, good confinement, and high-beta potential. The ARIES-CS study established that compact stellarators can be competitive with tokamaks as reactors. Many of the issues for a compact stellarator DEMO can be answered using results from large tokamaks, ITER D-T experiments and fusion materials, technology and component development programs, in addition to stellarators in operation, under construction or in development. However, a large next-generation stellarator will be needed to address some physics issues: size scaling and confinement at higher parameters, burning plasma issues, and operation with a strongly radiative divertor. Technology issues include simpler coils, structure, and divertor fabrication, and better cost information.

  20. Positioning accuracy assessment for the 4GEO/5IGSO/2MEO constellation of COMPASS

    Science.gov (United States)

    Zhou, ShanShi; Cao, YueLing; Zhou, JianHua; Hu, XiaoGong; Tang, ChengPan; Liu, Li; Guo, Rui; He, Feng; Chen, JunPing; Wu, Bin

    2012-12-01

    Determined to become a new member of the well-established GNSS family, COMPASS (or BeiDou-2) is developing its capabilities to provide high accuracy positioning services. Two positioning modes are investigated in this study to assess the positioning accuracy of COMPASS' 4GEO/5IGSO/2MEO constellation. Precise Point Positioning (PPP) for geodetic users and real-time positioning for common navigation users are utilized. To evaluate PPP accuracy, coordinate time series repeatability and discrepancies with GPS' precise positioning are computed. Experiments show that COMPASS PPP repeatability for the east, north and up components of a receiver within mainland China is better than 2 cm, 2 cm and 5 cm, respectively. Apparent systematic offsets of several centimeters exist between COMPASS precise positioning and GPS precise positioning, indicating errors remaining in the treatments of COMPASS measurement and dynamic models and reference frame differences existing between two systems. For common positioning users, COMPASS provides both open and authorized services with rapid differential corrections and integrity information available to authorized users. Our assessment shows that in open service positioning accuracy of dual-frequency and single-frequency users is about 5 m and 6 m (RMS), respectively, which may be improved to about 3 m and 4 m (RMS) with the addition of differential corrections. Less accurate Signal In Space User Ranging Error (SIS URE) and Geometric Dilution of Precision (GDOP) contribute to the relatively inferior accuracy of COMPASS as compared to GPS. Since the deployment of the remaining 1 GEO and 2 MEO is not able to significantly improve GDOP, the performance gap could only be overcome either by the use of differential corrections or improvement of the SIS URE, or both.

  1. Magnetic compass orientation in the blind mole rat Spalax ehrenbergi.

    Science.gov (United States)

    Kimchi, T; Terkel, J

    2001-02-01

    The blind mole rat Spalax ehrenbergi is a solitary, subterranean rodent that digs and inhabits a system of branching tunnels, with no above-ground exits, which it never leaves unless forced to. To survive, the mole rat must be able to orient efficiently in its tunnel system. The sensory channels available for spatial orientation in the subterranean environment are restricted in comparison with those existing above ground. This study examined the possibility that the mole rat is able to perceive and use the earth's magnetic field to orient in space. Experiments were performed using a device constructed from a pair of electromagnetic 'Helmholtz coils', which create a magnetic field whose direction and strength can be altered. In the first experiment, we tested a group of mole rats (N=33) in an eight-armed maze under the earth's natural magnetic field to determine whether they have directional preferences for the location of their sleeping nest, food chamber and toilet site. A second group of mole rats (N=30) was tested for their directional preference after the earth's magnetic field had been experimentally shifted by 180 degrees. We found that the first group exhibited a significant preference (Pbuild both their sleeping nest and their food store in the southern sector of the maze, whereas the second group shifted the location of their nests (Pbirds, magnetic compass orientation in the mole rat is independent of light stimulation. In the third experiment, we examined whether mole rats (N=24) use the earth's magnetic field as a compass cue to orient in a labyrinth. In the first stage (trials 1-13), the animals were trained to reach a goal box at the end of a complex labyrinth until all individuals had learned the task. In the second stage (trial 14), half the trained mole rats underwent another labyrinth trial under the earth's natural magnetic field, while the other half were tested under a magnetic field shifted by 180 degrees. We found a significant decrease (P<0

  2. TEM turbulence optimisation in stellarators

    CERN Document Server

    Proll, J H E; Xanthopoulos, P; Lazerson, S A; Faber, B J

    2015-01-01

    With the advent of neoclassically optimised stellarators, optimising stellarators for turbulent transport is an important next step. The reduction of ion-temperature-gradient-driven turbulence has been achieved via shaping of the magnetic field, and the reduction of trapped-electron mode (TEM) turbulence is adressed in the present paper. Recent analytical and numerical findings suggest TEMs are stabilised when a large fraction of trapped particles experiences favourable bounce-averaged curvature. This is the case for example in Wendelstein 7-X [C.D. Beidler $\\textit{et al}$ Fusion Technology $\\bf{17}$, 148 (1990)] and other Helias-type stellarators. Using this knowledge, a proxy function was designed to estimate the TEM dynamics, allowing optimal configurations for TEM stability to be determined with the STELLOPT [D.A. Spong $\\textit{et al}$ Nucl. Fusion $\\bf{41}$, 711 (2001)] code without extensive turbulence simulations. A first proof-of-principle optimised equilibrium stemming from the TEM-dominated stella...

  3. Planets, stars and stellar systems

    CERN Document Server

    Bond, Howard; McLean, Ian; Barstow, Martin; Gilmore, Gerard; Keel, William; French, Linda

    2013-01-01

    This is volume 3 of Planets, Stars and Stellar Systems, a six-volume compendium of modern astronomical research covering subjects of key interest to the main fields of contemporary astronomy. This volume on “Solar and Stellar Planetary Systems” edited by Linda French and Paul Kalas presents accessible review chapters From Disks to Planets, Dynamical Evolution of Planetary Systems, The Terrestrial Planets, Gas and Ice Giant Interiors, Atmospheres of Jovian Planets, Planetary Magnetospheres, Planetary Rings, An Overview of the Asteroids and Meteorites, Dusty Planetary Systems and Exoplanet Detection Methods. All chapters of the handbook were written by practicing professionals. They include sufficient background material and references to the current literature to allow readers to learn enough about a specialty within astronomy, astrophysics and cosmology to get started on their own practical research projects. In the spirit of the series Stars and Stellar Systems published by Chicago University Press in...

  4. Accelerated Fitting of Stellar Spectra

    CERN Document Server

    Ting, Yuan-Sen; Rix, Hans-Walter

    2016-01-01

    Stellar spectra are often modeled and fit by interpolating within a rectilinear grid of synthetic spectra to derive the stars' labels: stellar parameters and elemental abundances. However, the number of synthetic spectra needed for a rectilinear grid grows exponentially with the label space dimensions, precluding the simultaneous and self-consistent fitting of more than a few elemental abundances. Shortcuts such as fitting subsets of parameters separately can introduce unknown systematics and do not produce correct error covariances in the derived labels. In this paper we present a new approach -- CHAT (Convex Hull Adaptive Tessellation) -- which includes several new ideas for inexpensively generating a sufficient stellar synthetic library, using linear algebra and the concept of an adaptive, data-driven grid. A convex hull approximates the region where the data lie in the label space. A variety of tests with mock datasets demonstrate that CHAT can reduce the number of required synthetic model calculations by...

  5. Stellar Explosions: Hydrodynamics and Nucleosynthesis

    Science.gov (United States)

    José, Jordi

    2015-12-01

    Stars are the main factories of element production in the universe through a suite of complex and intertwined physical processes. Such stellar alchemy is driven by multiple nuclear interactions that through eons have transformed the pristine, metal-poor ashes leftover by the Big Bang into a cosmos with 100 distinct chemical species. The products of stellar nucleosynthesis frequently get mixed inside stars by convective transport or through hydrodynamic instabilities, and a fraction of them is eventually ejected into the interstellar medium, thus polluting the cosmos with gas and dust. The study of the physics of the stars and their role as nucleosynthesis factories owes much to cross-fertilization of different, somehow disconnected fields, ranging from observational astronomy, computational astrophysics, and cosmochemistry to experimental and theoretical nuclear physics. Few books have simultaneously addressed the multidisciplinary nature of this field in an engaging way suitable for students and young scientists. Providing the required multidisciplinary background in a coherent way has been the driving force for Stellar Explosions: Hydrodynamics and Nucleosynthesis. Written by a specialist in stellar astrophysics, this book presents a rigorous but accessible treatment of the physics of stellar explosions from a multidisciplinary perspective at the crossroads of computational astrophysics, observational astronomy, cosmochemistry, and nuclear physics. Basic concepts from all these different fields are applied to the study of classical and recurrent novae, type I and II supernovae, X-ray bursts and superbursts, and stellar mergers. The book shows how a multidisciplinary approach has been instrumental in our understanding of nucleosynthesis in stars, particularly during explosive events.

  6. A comparison of drift wave stability in stellarator and tokamak geometry

    International Nuclear Information System (INIS)

    The influence of plasma geometry on the linear stability of electrostatic ion-temperature-gradient driven drift modes (ITG or ηi=Ln/LTi modes) is investigated. An advanced fluid model is used for the ions together with Boltzmann distributed electrons. The derived eigenvalue equation is solved numerically. A comparison is made between an H-1NF [Fusion Technol. 17, 123 (1990)] like stellarator equilibrium, a numerical tokamak equilibrium and the analytical s-α equilibrium. The numerical and the analytical tokamak are found to be in good agreement in the low inverse aspect ratio limit. The growth rates of the tokamak and stellarator are comparable whereas the modulus of the real frequency is substantially larger in the stellarator. The threshold in ηi for the stellarator is found to be somewhat larger. In addition, a stronger stabilization of the ITG mode growth is found for large εn(=Ln/R) in the stellarator case

  7. Stellar magnetic activity and their influence on the habitability of exoplanets

    CERN Document Server

    Lüftinger, T; Johnstone, C P

    2015-01-01

    Stellar magnetism, explorable via polarimetry, is a crucial driver of activity, ionization, photodissociation, chemistry and winds in stellar environments. Thus it has an important impact on the atmospheres and magnetospheres of surrounding planets. Modeling of stellar magnetic fields and their winds is extremely challenging, both from the observational and the theoretical points of view, and only recent ground breaking advances in observational instrumentation - as were discussed during this Symposium - and a deeper theoretical understanding of magnetohydrodynamic processes in stars enable us to model stellar magnetic fields and winds and the resulting influence on surrounding planets in more and more detail. We have initiated a national and international research network (NFN): 'Pathways to Habitability - From Disks to Active Stars, Planets to Life', to address questions on the formation and habitability of environments in young, active stellar/planetary systems. In this contribution we discuss the work we ...

  8. The Power of Principled Bayesian Methods in the Study of Stellar Evolution

    CERN Document Server

    von Hippel, Ted; Stenning, David C; Robinson, Elliot; Jeffery, Elizabeth; Stein, Nathan; Jefferys, William H; O'Malley, Erin

    2016-01-01

    It takes years of effort employing the best telescopes and instruments to obtain high-quality stellar photometry, astrometry, and spectroscopy. Stellar evolution models contain the experience of lifetimes of theoretical calculations and testing. Yet most astronomers fit these valuable models to these precious datasets by eye. We show that a principled Bayesian approach to fitting models to stellar data yields substantially more information over a range of stellar astrophysics. We highlight advances in determining the ages of star clusters, mass ratios of binary stars, limitations in the accuracy of stellar models, post-main-sequence mass loss, and the ages of individual white dwarfs. We also outline a number of unsolved problems that would benefit from principled Bayesian analyses.

  9. Synthetic stellar populations: single stellar populations, stellar interior models and primordial proto-galaxies

    CERN Document Server

    Jiménez, R; Dunlop, J; Padoan, P; Peacock, J; Jimenez, Raul; Donald, James Mac; Dunlop, James; Padoan, Paolo; Peacock, John

    2004-01-01

    We present a new set of stellar interior and synthesis models for predicting the integrated emission from stellar populations in star clusters and galaxies of arbitrary age and metallicity. This work differs from existing spectral synthesis codes in a number of important ways, namely (1) the incorporation of new stellar evolutionary tracks, with sufficient resolution in mass to sample rapid stages of stellar evolution; (2) a physically consistent treatment of evolution in the HR diagram, including the approach to the main sequence and the effects of mass loss on the giant and horizontal-branch phases. Unlike several existing models, ours yield consistent ages when used to date a coeval stellar population from a wide range of spectral features and colour indexes. We rigorously discuss degeneracies in the age-metallicity plane and show that inclusion of spectral features blueward of 4500 AA, suffices to break any remaining degeneracy and that with moderate S/N spectra (10 per 20AA, resolution element) age and m...

  10. Atomic Data for Stellar Nucleosynthesis

    Science.gov (United States)

    Sneden, Christopher Alan; Lawler, James E.; Den Hartog, Elizabeth A.; Wood, Michael

    2015-08-01

    Stellar chemical composition analyses can only yield reliable abundances if the atomic transition parameters are accurately determined. During the last couple of decades a renewed emphasis on laboratory spectroscopy has produced large sets of useful atomic transition probabilities for species of interest to stellar spectroscopists. In many cases the transition data are of such high quality that they play little part in the abundance error budgets. In this talk we will review the current state of atomic parameters, highlighting the areas of satisfactory progress and noting places where further laboratoryprogress will be welcome.

  11. Recent developments in stellarator physics

    International Nuclear Information System (INIS)

    Experimental and theoretical work on the stellarator concept has established its position as the best alternate concept for fusion power. Its plasma properties are comparable to, or better than, those obtained in comparable tokamak devices. Confinement and transport should be adequate for reactor operation, with high-β operation possible. Although the coil configurations in present experiments are complicated, stellarator reactors could be simpler than tokamaks. The possibilities of steady-state operation, little recirculating power, good start-up and control properties, no disruptions, modular construction, and a built-in divertor make it an obvious direction for tokamak evolution as well as a viable alternate concept in its own right

  12. Fundamental stellar properties from asteroseismology

    DEFF Research Database (Denmark)

    Silva Aguirre, V.; Casagrande, L.; Miglio, A.

    2013-01-01

    different evolutionary phases. We present our results on determinations of masses, radii, and distances of stars in the CoRoT and Kepler fields, showing that we can map and date different regions of the galactic disk and distinguish gradients in the distribution of stellar properties at different heights......Accurate characterization of stellar populations is of prime importance to correctly understand the formation and evolution process of our Galaxy. The field of asteroseismology has been particularly successful in such an endeavor providing fundamental parameters for large samples of stars in...

  13. Deriving stellar inclination of slow rotators using stellar activity

    Energy Technology Data Exchange (ETDEWEB)

    Dumusque, X., E-mail: xdumusque@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

    2014-12-01

    Stellar inclination is an important parameter for many astrophysical studies. Although different techniques allow us to estimate stellar inclination for fast rotators, it becomes much more difficult when stars are rotating slower than ∼2-2.5 km s{sup –1}. By using the new activity simulation SOAP 2.0 which can reproduce the photometric and spectroscopic variations induced by stellar activity, we are able to fit observations of solar-type stars and derive their inclination. For HD 189733, we estimate the stellar inclination to be i=84{sub −20}{sup +6} deg, which implies a star-planet obliquity of ψ=4{sub −4}{sup +18} considering previous measurements of the spin-orbit angle. For α Cen B, we derive an inclination of i=45{sub −19}{sup +9}, which implies that the rotational spin of the star is not aligned with the orbital spin of the α Cen binary system. In addition, assuming that α Cen Bb is aligned with its host star, no transit would occur. The inclination of α Cen B can be measured using 40 radial-velocity measurements, which is remarkable given that the projected rotational velocity of the star is smaller than 1.15 km s{sup –1}.

  14. Spectroscopy of final states with neutral particles in COMPASS

    Energy Technology Data Exchange (ETDEWEB)

    Uhl, Sebastian [Technische Universitaet Muenchen, Physik Department E18, 85748 Garching (Germany)

    2014-07-01

    To study the spectrum of light hadrons the COMPASS experiment at CERN has collected a huge data set with a negative pion beam impinging on a liquid hydrogen target. Resonances are diffractively produced at squared four-momentum transfers to the target between 0.1 (GeV/c){sup 2} and 1 (GeV/c){sup 2}. The two-stage magnetic spectrometer with two electromagnetic calorimeters allows to study charged as well as semi-neutral final states, thus allowing an immediate consistency check between the flagship channel π{sup -}π{sup -}π{sup +} and its isospin partner π{sup -}π{sup 0}π{sup 0}. The decomposition of the three-pion mass spectra is done with the help of a partial-wave analysis. Partial waves up to spin six are included in the first step of the analysis, where the spin-parity decomposition of the data is performed in bins of the three-pion mass and the squared four-momentum transfer t'. The binning in t' provides a handle to better separate the resonant and non-resonant parts of the intensity in the second stage of the analysis, the modeling of the mass dependence of the spin-density matrix in order to extract resonance parameters.

  15. Spectroscopy of final states with neutral particles in COMPASS

    International Nuclear Information System (INIS)

    To study the spectrum of light hadrons the COMPASS experiment at CERN has collected a huge data set with a negative pion beam impinging on a liquid hydrogen target. Resonances are diffractively produced at squared four-momentum transfers to the target between 0.1 (GeV/c)2 and 1 (GeV/c)2. The two-stage magnetic spectrometer with two electromagnetic calorimeters allows to study charged as well as semi-neutral final states, thus allowing an immediate consistency check between the flagship channel π-π-π+ and its isospin partner π-π0π0. The decomposition of the three-pion mass spectra is done with the help of a partial-wave analysis. Partial waves up to spin six are included in the first step of the analysis, where the spin-parity decomposition of the data is performed in bins of the three-pion mass and the squared four-momentum transfer t'. The binning in t' provides a handle to better separate the resonant and non-resonant parts of the intensity in the second stage of the analysis, the modeling of the mass dependence of the spin-density matrix in order to extract resonance parameters.

  16. Resonance effects indicate radical pair mechanism for avian magnetic compass

    Science.gov (United States)

    Ritz, Thorsten

    2005-03-01

    Migratory birds possess a physiological magnetic compass that helps them to find north during their migratory flights, but the mechanism underlying this ability is not understood. In vitro experiments show that two types of mechanisms are in principle capable of detecting earth-strength magnetic fields in biological systems: the use of biological magnetic materials such as magnetite crystals, or magnetically sensitive chemical reactions. We have recently demonstrated that oscillating magnetic fields can provide a viable diagnostic test to identify the existence of a radical-pair mechanism as they will not affect the properties of magnetite-based sensors, but disrupt a radical-pair based mechanism through resonance effects. European robins, a species of migratory birds, were disoriented in a magnetic orientation test when a very weak (100 nT) oscillating field of 1.3 or 7 MHz was added to the geomagnetic field. Moreover, the effect of the oscillating field depended on the alignment of oscillating field with the geomagnetic field and showed an intensity dependence consistent with theoretical expectations from the radical pair mechanism, thereby providing evidence for the existence of a radical-pair mechanism in birds. We will discuss future avenues of research towards identifying not only the mechanism, but also the chemical nature of the receptors underlying magnetoreception, and in particular the photoreceptor chryptochrome, an emerging candidate for the long sought after magnetoreceptor.

  17. Fast Photon Detection for Particle Identification with COMPASS RICH-1

    CERN Document Server

    Abbon, P; Angerer, H; Apollonio, M; Birsa, R; Bordalo, P; Bradamante, Franco; Bressan, A; Busso, L; Chiosso, M; Ciliberti, P; Colantoni, M L; Costa, S; Dalla Torre, S; Dafni, T; Delagnes, E; Deschamps, H; Díaz, V; Dibiase, N; Duic, V; Eyrich, W; Faso, D; Ferrero, A; Finger, M; Fischer, H; Gerassimov, S; Giorgi, M; Gobbo, B; Hagemann, R; Von Harrach, D; Heinsius, F H; Horikawa, S; Joosten, R; Ketzer, B; Königsmann, K C; Kolosov, V N; Konorov, I; Kramer, Daniel; Kunne, Fabienne; Lehmann, A; Levorato, S; Maggiora, A; Magnon, A; Mann, A; Martin, A; Menon, G; Mutter, A; Nahle, O; Nerling, F; Neyret, D; Pagano, P; Panebianco, S; Panzieri, D; Paul, S; Pesaro, G; Polak, J; Rebourgeard, P; Robinet, F; Rocco, E; Schiavon, Paolo; Schill, C; Schroder, W; Silva, L; Slunecka, M; Sozzi, F; Steiger, L; Sulc, M; Svec, M; Tessarotto, F; Teufel, A; Wollny, H; COMPASS RICH Upgrade Group

    2007-01-01

    Particle identification at high rates is an important challenge for many current and future high-energy physics experiments. The upgrade of the COMPASS RICH-1 detector requires a new technique for Cherenkov photon detection at count rates of several $10^6$ per channel in the central detector region, and a read-out system allowing for trigger rates of up to 100 kHz. To cope with these requirements, the photon detectors in the central region have been replaced with the detection system described in this paper. In the peripheral regions, the existing multi-wire proportional chambers with CsI photocathode are now read out via a new system employing APV pre-amplifiers and flash ADC chips. The new detection system consists of multi-anode photomultiplier tubes (MAPMT) and fast read-out electronics based on the MAD4 discriminator and the F1-TDC chip. The RICH-1 is in operation in its upgraded version for the 2006 CERN SPS run. We present the photon detection design, constructive aspects and the first Cherenkov light ...

  18. Test of OZI violation in vector meson production with COMPASS

    CERN Document Server

    Bernhard, Johannes

    2011-01-01

    The COMPASS experiment at CERN SPS completed its data taking with hadron beams ($p,\\pi, K$) in the years 2008 and 2009 by collecting a large set of data using different targets (H$_{2}$, Pb, Ni, W). These data are dedicated to hadron spectroscopy, where the focus is directed to the search for exotic bound states of quarks and gluons (hybrids, glueballs). The production of such states is known to be favoured in glue-rich environments, e.g. so-called OZI-forbidden processes. The OZI rule postulates that processes with disconnected quark line diagrams are forbidden. On the one hand, the study of the degree of OZI violation in vector meson production yields the possibilty to learn more about the involved production mechanisms. On the other hand it helps to understand the nucleon's structure itself. Contrary to former experiments, the large data sample allows for detailed studies in respect to Feynman's variable $x_{F}$. We present results from the ongoing analysis on the comparison of $\\omega$ and $\\phi$ vector m...

  19. COMPASS Final Report: Low Cost Robotic Lunar Lander

    Science.gov (United States)

    McGuire, Melissa L.; Oleson, Steven R.

    2010-01-01

    The COllaborative Modeling for the Parametric Assessment of Space Systems (COMPASS) team designed a robotic lunar Lander to deliver an unspecified payload (greater than zero) to the lunar surface for the lowest cost in this 2006 design study. The purpose of the low cost lunar lander design was to investigate how much payload can an inexpensive chemical or Electric Propulsion (EP) system deliver to the Moon s surface. The spacecraft designed as the baseline out of this study was a solar powered robotic lander, launched on a Minotaur V launch vehicle on a direct injection trajectory to the lunar surface. A Star 27 solid rocket motor does lunar capture and performs 88 percent of the descent burn. The Robotic Lunar Lander soft-lands using a hydrazine propulsion system to perform the last 10% of the landing maneuver, leaving the descent at a near zero, but not exactly zero, terminal velocity. This low-cost robotic lander delivers 10 kg of science payload instruments to the lunar surface.

  20. Overview of the COMPASS Experimental Programme on TMDs and GPDs

    Science.gov (United States)

    Bradamante, Franco

    2016-03-01

    The investigation of the recently introduced transverse momentum dependent (TMD) parton distribution functions (PDFs) and generalized parton distributions (GPDs) is an important part of the programme of the COMPASS experiment at CERN. A variety of Semi-inclusive deeply inelastic scattering (SIDIS) measurements on transversely polarized proton and deuteron targets from the 2002-2010 data have allowed to obtain a wealth of results on the transversity distribution and on the TMD PDFs. Further SIDIS measurements are planned in 2016 and 2017 on a pure hydrogen target. In a complementary approach, the first ever Drell-Yan measurement on a transversely polarized proton target is the objective of the 2015 run, still ongoing at the time of this conference, to address the fundamental issue of the change of sign of the Sivers function when measured in the Drell-Yan process as compared to that measured in SIDIS. GPDs are also being investigated. Measurements of the exclusive muon-production of vector mesons, in particular the ρ ^0 and the ω , on transversely polarized proton targets have provided information on the GPD E. Preliminary results from a test run on deeply virtual compton scattering of 160 GeV muons on a liquid hydrogen target are also given, as well as plans for a two-year long run in 2016 and 2017 with a suitably modified spectrometer.

  1. High performance and stability in COMPASS-D

    International Nuclear Information System (INIS)

    COMPASS-D is a compact, adaptable, D-shaped tokamak equipped with powerful heating (ECRH) and current drive (LHCD/ECCD) systems allowing access to both H-mode (ELMy and ELM-free) and quasi-stationary high beta regimes under conditions of dominant electron heating (Te>Ti), negligible external momentum input and no central fuelling. Control and avoidance of neo-classical tearing modes (NTMs) has enabled quasi-stationary high beta (βN∼2, βp>1) discharges to be sustained for ∼ 20 energy confinement times and a duration corresponding to 20% of that of a nominal ITER discharge, when normalised to the current diffusion time. Controlled seeding of NTMs by external application of resonant magnetic perturbations has enabled NTM onset criteria to be carefully explored and compared with theory; observed island evolutions follow theoretical expectations. Off-axis lower hybrid current drive (LHCD) has been reliably used to completely stabilise NTMs in high beta discharges. Detailed modelling has shown that the stabilising effect is consistent with a reduction in the stability index Δ', although other stabilisation mechanisms may also contribute. High frequency energetic particle driven instabilities (∼400kHz), which exhibit frequency-sweeping ('chirping'), have, for the first time, been observed with high power ECRH as the sole source of auxiliary heating. (author)

  2. Characterization of topological phases in the compass ladder model

    Science.gov (United States)

    Haghshenas, R.; Langari, A.; Rezakhani, A. T.

    2016-05-01

    The phase diagram of the quantum compass ladder model is investigated through numerical density matrix renormalization group based on infinite matrix product state algorithm and analytic effective perturbation theory. For this model we obtain two symmetry-protected topological phases, protected by a {{Z}2}× {{Z}2} symmetry, and a topologically-trivial Z 2-symmetry-breaking phase. The symmetry-protected topological phases—labeled by symmetry fractionalization—belong to different topological classes, where the complex-conjugate symmetry uniquely distinguishes them. An important result of this classification is that, as revealed by the nature of the Z 2-symmetry-breaking phase, the associated quantum phase transitions are accompanied by an explicit symmetry breaking, and thus a local-order parameter conclusively identifies the phase diagram of the underlying model. This is in stark contrast to previous studies which require a non-local string order parameter to distinguish the corresponding quantum phase transitions. We numerically examine our results and show that the local-order parameter is related to the magnetization exponent 0.12+/- 0.01 .

  3. Fluid rotation and resonant magnetic perturbations in COMPASS-C

    International Nuclear Information System (INIS)

    The application of resonant magnetic field perturbations (RMPs), most importantly those with helicity m=2, n=1, can lead to large magnetic islands and locked mode effects. Plasma rotation effects, including poloidal flow damping, play an important role in a phenomenological resistive MHD model which is used to interpret the experimental results on mode locking in COMPASS-C. In this paper we examine the changes of toroidal velocity occurring at the time of RMP mode locking and unlocking and show how they can be reconciled with the theoretical model. These effects are important because the threshold above which error fields lead to driven islands and reduced confinement and/or disruptions is predicted to be very low in large tokamaks, such as ITER (br(2,1)/BΦ∼10-5). One scheme to raise the threshold, and hence reduce the required engineering accuracy, is to use NBI to increase the plasma rotation velocity. It is therefore, important to establish experimentally the role of plasma rotation velocity in the penetration of magnetic fields to form islands. (author) 7 refs., 3 figs

  4. Characterization of topological phases in the compass ladder model.

    Science.gov (United States)

    Haghshenas, R; Langari, A; Rezakhani, A T

    2016-05-01

    The phase diagram of the quantum compass ladder model is investigated through numerical density matrix renormalization group based on infinite matrix product state algorithm and analytic effective perturbation theory. For this model we obtain two symmetry-protected topological phases, protected by a Z2 × Z2 symmetry, and a topologically-trivial Z2-symmetry-breaking phase. The symmetry-protected topological phases--labeled by symmetry fractionalization--belong to different topological classes, where the complex-conjugate symmetry uniquely distinguishes them. An important result of this classification is that, as revealed by the nature of the Z2-symmetry-breaking phase, the associated quantum phase transitions are accompanied by an explicit symmetry breaking, and thus a local-order parameter conclusively identifies the phase diagram of the underlying model. This is in stark contrast to previous studies which require a non-local string order parameter to distinguish the corresponding quantum phase transitions. We numerically examine our results and show that the local-order parameter is related to the magnetization exponent 0.12 ± 0.01. PMID:27023290

  5. Polarised Drell-Yan measurements at COMPASS-II

    CERN Document Server

    Zemlyanichkina, Elena

    2014-01-01

    The spin structure of the nucleon including the Parton Distribution Functions (PDFs) is an im- portant subject studied by the COMPASS experiment at CERN (SPS). The transverse momentum dependent parton distribution functions (TMD PDFs) of the proton and deuteron from Semi- Inclusive Deep Inelastic Scattering (SIDIS) have been studied so far. The Drell-Yan (DY) pro- cess is a complementary way to access the TMD PDFs, using a transversely polarised target. Studying the angular distributions of dimuons from the DY events produced in the scattering of a 190 GeV = c momentum negative pion beam off a transversely polarised proton target (NH 3 ) we are able to extract the azimuthal spin asymmetries, each containing a convolution of two PDFs, one from the target quark and one from the beam anti-quark. Disentangling the contributions from these two PDFs we can access four of the eight TMD PDFs needed to describe the nucleon structure at leading order QCD, like the Sivers and the Boer-Mulders functions. The opportunity ...

  6. Overview of the COMPASS Experimental Programme on TMDs and GPDs

    Science.gov (United States)

    Bradamante, Franco

    2016-08-01

    The investigation of the recently introduced transverse momentum dependent (TMD) parton distribution functions (PDFs) and generalized parton distributions (GPDs) is an important part of the programme of the COMPASS experiment at CERN. A variety of Semi-inclusive deeply inelastic scattering (SIDIS) measurements on transversely polarized proton and deuteron targets from the 2002-2010 data have allowed to obtain a wealth of results on the transversity distribution and on the TMD PDFs. Further SIDIS measurements are planned in 2016 and 2017 on a pure hydrogen target. In a complementary approach, the first ever Drell-Yan measurement on a transversely polarized proton target is the objective of the 2015 run, still ongoing at the time of this conference, to address the fundamental issue of the change of sign of the Sivers function when measured in the Drell-Yan process as compared to that measured in SIDIS. GPDs are also being investigated. Measurements of the exclusive muon-production of vector mesons, in particular the ρ ^0 and the ω , on transversely polarized proton targets have provided information on the GPD E. Preliminary results from a test run on deeply virtual compton scattering of 160 GeV muons on a liquid hydrogen target are also given, as well as plans for a two-year long run in 2016 and 2017 with a suitably modified spectrometer.

  7. COMPASS COmmon Muon and Proton Apparatus for Structure and Spectroscopy

    CERN Multimedia

    Ciliberti, P; Wang, L; Ostrick, M; Nerling, F; Platchkov, S; Lichtenstadt, J; Marianski, B M; Vertogradov, L; Yukaev, A; Meshcheriakov, G; Gushterski, R I; Orlov, I; Faessler, M; Doshita, N; Horikawa kondo, K; Peng, J; Menon, G; Ziembicki, M K; Beck, R; Dhara, L; Sarkar, S; Windmolders, R; Ramos, S E; Stolarski, M; Gerassimov, S; Kabuss, E; Du fresne von hohenesche, N; Marchand, C; D'hose, N; Zhuravlev, N; Malyshev, V; Nagaytsev, A; Zemlyanichkina, E; Paul, S; Grabmueller, S; Michigami, T; Castelli, G; Sbrizzai, G; Matsuda, T; Kurjata, R P; Horikawa, N; Srnka, A; Dasgupta, S; Sawada, T; Barth, J; Denisov, O; Chiosso, M; Gnesi, I; Schiavon, P; Levorato, S; Baum, G; Reicherz, G A; Ter wolbeek, J A; Graf von harrach, D; Moinester, M A; Kurek, K; Tkachev, L; Ivanshin, I; Lavrentyev, V; Lishin, V; Liska, T; Konorov, I; Friedrich, J M; Austregesilo, A; Bicker, K A; Steffen, D; Iwata, T; Tessarotto, F; Joosten, R; Chang, W; Cotte, D G; Pretz, J J; Klein, F R; Hahne, D; Schmitt, L; Bradamante, F; Marques quintans, C; Franco, C; Burtin, E; Ferrero, A; Kuchinskiy, N; Guskov, A; Rogacheva, N; Konstantinov, V; Mikhaylov, Y; Kraemer, M C; Matsuda, H; Grosse-perdekamp, M; Schmieden, H; Bertini, R; Sosio, S; Bordalo, P; Faria pereira lopes da silva, L M F; Zavertyaev, M; Tskhay, V; Meyer, W P; Fischer, H; Schmidt, K; Herrmann, F; Augustyniak, W J; Alexeev, G; Kiselev, Y; Kouznetsov, O; Samartsev, A; Anfimov, N; Akhunzyanov, R; Khaustov, G; Khokhlov, I; Nikolaenko, V; Slunecka, M; Virius, M; Uhl, S; Riedl, C K; Szabelski, A; Da rocha azevedo, C D; Suzuki, H; Sinha, L; Mallot, G; Martin, A; Badelek, B M; Da silva nunes, A S; Nowak, W; Neyret, D; Sandacz, A; Efremov, A; Krumshteyn, Z; Peshekhonov, D; Pontecorvo, G; Savin, I; Vlasov, N; Ryabchikov, D; Finger, M; Montuenga sfeir, P J; Birsa, R; Dalla torre, S; Crespo, M L; Vauth, A S; Balestra, F; Amoroso, A; Tessaro, S; Makke, N; Varanda quaresma, M M; Kotzinian, A; Buchele, M; Sirtl, S M; Kunne, F; Bedfer, Y; Seder, E E; Donskov, S; Poliakov, V; Finger, M; Grube, B; Haas, F; Marzec, J; Bisplinghoff, J; Das, S; Piragino, G; Tosello, F; Parsamyan, B; Bressan, A; Ishimoto, S; Menezes pires, C; Sznajder, P; Anosov, V; Gavrishchuk, O; Olshevskiy, A; Chirikov-zorin, I; Kravchuk, N; Antonov, A; Samoylenko, V; Kolosov, V; Novy, J; Mann, A B; Huber, S; Cicuttin, A; Zaremba, K; Hinterberger, F; Jahn, R J; Sulc, M; Teng, Y

    2002-01-01

    %NA58 %title\\\\ \\\\COMPASS is a new fixed target experiment at the SPS to study hadron spectroscopy with hadron beams (up to 300~GeV/c) and hadron structure with polarized muon beams (100-200~GeV/c).\\\\ \\\\The main physics objective of the muon beam program is the measurement of $\\Delta$G, the gluon polarization in a longitudinally polarized nucleon. More generally, it is planned to measure the flavour separated spin structure functions of the nucleons in polarized muon - polarized nucleon deep inelastic scattering, both with longitudinal and transverse target polarization modes. For these measurements a new 1.3~m long polarized target and a superconducting solenoid with 200~mrad acceptance will be used.\\\\ \\\\The hadronic program comprises a search for glueballs in the high mass region (above 2~GeV/c$^{2}$) in exclusive diffractive pp scattering, a study of leptonic and semileptonic decays of charmed hadrons with high statistics and precision, and Primakoff scattering with various probes. A detailed investigation ...

  8. PREFACE: Stellar Atmospheres in the Gaia Era - Preface

    Science.gov (United States)

    Lobel, Alex; De Greve, Jean-Pierre; Van Rensbergen, Walter

    2011-12-01

    Volume 328 (2011) of the Journal of Physics: Conference Series provides a record of the invited and contributed talks, and of the posters presented at the GREAT-ESF workshop entitled `Stellar Atmospheres in the Gaia Era: Quantitative Spectroscopy and Comparative Spectrum Modelling' (http://great-esf.oma.be and mirrored at http://spectri.freeshell.org/great-esf). The conference was held on 23-24 June 2011 at the Vrije Universiteit Brussel, Belgium. 47 scientists from 11 countries around the world attended the workshop. The ESA-Gaia satellite (launch mid 2013) will observe a billion stellar objects in the Galaxy and provide spectrophotometric and high-resolution spectra of an unprecedented number of stars observed with a space-based instrument. The confrontation of these data with theoretical models will significantly advance our understanding of the physics of stellar atmospheres. New stellar populations such as previously unknown emission line stars will be discovered, and fundamental questions such as the basic scenarios of stellar evolution will be addressed with Gaia data. The 33 presentations and 4 main discussion sessions at the workshop addressed important topics in spectrum synthesis methods and detailed line profile calculations urgently needed for accurate modelling of stellar spectra. It brought together leading scientists and students of the stellar physics communities investigating hot and cool star spectra. The scientific programme of the workshop consisted of 23 oral (6 invited) and 10 poster presentations about cool stars (first day; Comparative Spectrum Modelling and Quantitative Spectroscopy of Cool Stars), and hot stars (second day; Quantitative Spectroscopy of Hot Stars). The hot and cool stars communities use different spectrum modelling codes for determining basic parameters such as the effective temperature, surface gravity, iron abundance, and the chemical composition of stellar atmospheres. The chaired sessions of the first day highlighted

  9. Investigating The Relationship Between Flourishing And Self-Compassion: A Structural Equation Modeling Approach

    Directory of Open Access Journals (Sweden)

    Seydi Ahmet Satici

    2013-12-01

    Full Text Available The purpose of this study was to examine the relationships between flourishing and self-compassion. Participants were 347 (194 female and 153 male university students, between age range of 18-24, who completed a questionnaire package that included the Flourishing Scale and the Self-compassion Scale. The relationships between flourishing and self-compassion were examined using correlation analysis and the hypothesis model was tested through structural equation modeling. In correlation analysis, self-kindness, common humanity, and mindfulness factors of self-compassion were found positively and self-judgment, isolation, and over-identification factors of self-compassion were found negatively related to flourishing. The model demonstrated fit (χ²=37.12, χ²/df = 4.12, RMSEA = .095, SRMR = .074, GFI = .97, AGFI = .91, CFI= .97, and NFI = .96. According to path analysis results, self-kindness, common humanity, and mindfulness were predicted positively by flourishing. Further, flourishing predicted self-judgment, isolation, and over-identification in a negative way. Results were discussed in the light of the related literature.

  10. The Role of Self-Compassion in Buffering Symptoms of Depression in the General Population.

    Directory of Open Access Journals (Sweden)

    Annett Körner

    Full Text Available Self-compassion, typically operationalized as the total score of the Self-Compassion Scale (SCS; Neff, 2003b, has been shown to be related to increased psychological well-being and lower depression in students of the social sciences, users of psychology websites and psychotherapy patients. The current study builds on the existing literature by examining the link between self-compassion and depressive symptomatology in a sample representative of the German general population (n = 2,404. The SCS subscales of self-judgment, isolation, and over-identification, and the "self-coldness", composite score, which encompass these three negative subscales, consistently differed between subsamples of individuals without any depressive symptoms, with any depressive syndromes, and with major depressive disorder. The contribution of the positive SCS subscales of self-kindness, common humanity, and mindfulness to the variance in depressive symptomatology was almost negligible. However, when combined to a "self-compassion composite", the positive SCS subscales significantly moderated the relationship between "self-coldness" and depressive symptoms in the general population. This speaks for self-compassion having the potential to buffer self-coldness related to depression--providing an argument for interventions that foster self-caring, kind, and forgiving attitudes towards oneself.

  11. Differential roles of fairness- and compassion-based motivations for cooperation, defection, and punishment.

    Science.gov (United States)

    Singer, Tania; Steinbeis, Nikolaus

    2009-06-01

    The present paper briefly describes and contrasts two different motivations crucially involved in decision making and cooperation, namely fairness-based and compassion-based motivation. Whereas both can lead to cooperation in comparable social situations, we suggest that they are driven by fundamentally different mechanisms and, overall, predict different behavioral outcomes. First, we provide a brief definition of each and discuss the relevant behavioral and neuroscientific literature with regards to cooperation in the context of economic games. We suggest that, whereas both fairness- and compassion-based motivation can support cooperation, fairness-based motivation leads to punishment in cases of norm violation, while compassion-based motivation can, in cases of defection, counteract a desire for revenge and buffer the decline into iterative noncooperation. However, those with compassion-based motivation alone may get exploited. Finally, we argue that the affective states underlying fairness-based and compassion-based motivation are fundamentally different, the former driven by anger or fear of being punished and the latter by a wish for the other person's well-being. PMID:19580551

  12. Spontaneous expression of magnetic compass orientation in an epigeic rodent: the bank vole, Clethrionomys glareolus

    Science.gov (United States)

    Oliveriusová, Ludmila; Němec, Pavel; Pavelková, Zuzana; Sedláček, František

    2014-07-01

    Magnetoreception has been convincingly demonstrated in only a few mammalian species. Among rodents, magnetic compass orientation has been documented in four species of subterranean mole rats and two epigeic (i.e. active above ground) species—the Siberian hamster and the C57BL/6J mouse. The mole rats use the magnetic field azimuth to determine compass heading; their directional preference is spontaneous and unimodal, and their magnetic compass is magnetite-mediated. By contrast, the primary component of orientation response is learned in the hamster and the mouse, but both species also exhibit a weak spontaneous bimodal preference in the natural magnetic field. To determine whether the magnetic compass of wild epigeic rodents features the same functional properties as that of laboratory rodents, we investigated magnetic compass orientation in the bank vole Clethrionomys glareolus (Cricetidae, Rodentia). The voles exhibited a robust spontaneous bimodal directional preference, i.e. built nests and slept preferentially along the north-south axis, and deflected their directional preference according to a shift in the direction of magnetic north, clearly indicating that they were deriving directional information from the magnetic field. Thus, bimodal, axially symmetrical directional choice seems to be a common feature shared by epigeic rodents. However, spontaneous directional preference in the bank vole appeared to be more pronounced than that reported in the hamster and the mouse. These findings suggest that bank voles are well suited for future studies investigating the adaptive significance and mechanisms of magnetic orientation in epigeic rodents.

  13. The evolution of stellar structures in dwarf galaxies

    OpenAIRE

    Bastian, N.; Weisz, D. R.; Skillman, E. D.; McQuinn, K. B. W.; Dolphin, A. E.; Gutermuth, R. A.; Cannon, J. M.; Ercolano, B.; Gieles, M.; Kennicutt, R. C.; Walter, F.

    2010-01-01

    We present a study of the variation of spatial structure of stellar populations within dwarf galaxies as a function of the population age. We use deep Hubble Space Telescope/Advanced Camera for Surveys imaging of nearby dwarf galaxies in order to resolve individual stars and create composite colour-magnitude diagrams (CMDs) for each galaxy. Using the obtained CMDs, we select Blue Helium Burning stars (BHeBs), which can be unambiguously age-dated by comparing the absolute magnitude of individu...

  14. On the distribution of stellar-sized black hole spins

    CERN Document Server

    Nielsen, Alex B

    2016-01-01

    Black hole spin will have a large impact on searches for gravitational waves with advanced detectors. While only a few stellar mass black hole spins have been measured using X-ray techniques, gravitational wave detectors have the capacity to greatly increase the statistics of black hole spin measurements. We show what we might learn from these measurements and how the black hole spin values are influenced by their formation channels.

  15. An ATCA Embedded Data Acquisition and Control System for the Compass tokamak

    International Nuclear Information System (INIS)

    The Compass tokamak is currently being installed in Prague, Czech Republic. Its control and data acquisition system is being redesigned and built from scratch and it will be based on novel digital technologies. The proposed hardware for the controller is based on the PICMG 3.0 Advanced Telecommunications Computing Architecture TM (ATCA) standard. The platform contains one ATCA controller with a Gigabit Ethernet interface, up to 12 ATCA Digitizer-Generator-Processor (DGP) cards and trigger and clock inputs, all on a 12U shelf. The multi-core x86-based General Purpose Processor (GPP) controller will be connected to the DGP cards by Peripheral Component Interconnect Express TM (PCIe) point-to-point links through the ATCA backplane. Multiple-input multiple-output (MIMO) signal processing will be shared by the DGP cards using the built-in Field Programmable Gate Arrays (FPGAs) and the controller's x 86 general processor. Eleven Aurora TM 2.5 Gbit/s links allow to further parallelize the execution of code among several FPGAs. In order to guarantee real-time execution of the control codes a framework based on Linux and the Real-Time Application Interface (RTAI) will be used. This will explore the features provided by the new multi-core technologies. Synchronization between the subsystems will be guaranteed by a real-time event network. The interface to the system will be provided by the FireSignal control and data acquisition system. This will allow the operators and diagnostic coordinators to configure the hardware, prepare the discharges, pre-program events of interest and follow results from the discharge. FireSignal will also orchestrate the data flow coming from the different diagnostics into the database and to registered data clients.

  16. Service-Learning and Critical Emotion Studies: On the Perils of Empathy and the Politics of Compassion

    Science.gov (United States)

    Langstraat, Lisa; Bowdon, Melody

    2011-01-01

    This article explores the mutually enriching bodies of scholarship in service-learning and Critical Emotion Studies with a focus on empathy and compassion, which, perhaps more than any other emotions, hold a prominent place in service-learning literature. We offer an overview of nascent research on empathy and compassion in Critical Emotion…

  17. 76 FR 47596 - Notice of Scientific Summit; The Science of Compassion-Future Directions in End-of-Life and...

    Science.gov (United States)

    2011-08-05

    ... HUMAN SERVICES National Institutes of Health Notice of Scientific Summit; The Science of Compassion... Institute of Nursing Research (NINR), National Institutes of Health (NIH), Department of Health and Human Services, will convene a scientific summit titled ``The Science of Compassion--Future Directions in...

  18. Challenges in Stellar Population Studies

    CERN Document Server

    Brinchmann, Jarle

    2009-01-01

    The stellar populations of galaxies contain a wealth of detailed information. From the youngest, most massive stars, to almost invisible remnants, the history of star formation is encoded in the stars that make up a galaxy. Extracting some, or all, of this informationhas long been a goal of stellar population studies. This was achieved in the last couple of decades and it is now a routine task, which forms a crucial ingredient in much of observational galaxy evolution, from our Galaxy out to the most distant systems found. In many of these domains we are now limited not by sample size, but by systematic uncertainties and this will increasingly be the case in the future. The aim of this review is to outline the challenges faced by stellar population studies in the coming decade within the context of upcoming observational facilities. I will highlight the need to better understand the near-IR spectral range and outline the difficulties presented by less well understood phases of stellar evolution such as therma...

  19. Stellar model fits and inversions

    DEFF Research Database (Denmark)

    Christensen-Dalsgaard, J.

    2012-01-01

    The recent asteroseismic data from the CoRoT and Kepler missions have provided an entirely new basis for investigating stellar properties. This has led to a rapid development in techniques for analysing such data, although it is probably fair to say that we are still far from having the tools req...

  20. The Supernova - A Stellar Spectacle.

    Science.gov (United States)

    Straka, W. C.

    This booklet is part of an American Astronomical Society curriculum project designed to provide teaching materials to teachers of secondary school chemistry, physics, and earth science. The following topics concerning supernovae are included: the outburst as observed and according to theory, the stellar remnant, the nebular remnant, and a summary…