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Sample records for jrvi magnus kallas

  1. Magnus in Raffaello

    NASA Image and Video Library

    2011-07-11

    S135-E-007420 (11 July 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, may well be thinking of the word "ocean" for two reasons. Her navigation in the weightlessness of space could be loosely compared to swimming, and she is surrounded by an "ocean” of supplies and equipment in the Raffaello multi-purpose logistics module. The supplies and spare parts are for use and consumption for the International Space Station and its crews. Raffaello was transported up to the station by Magnus and her three crewmates aboard the space shuttle Atlantis. Photo credit: NASA

  2. Magnus in US Lab

    NASA Image and Video Library

    2011-07-11

    S135-E-007435 (11 July 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, is pictured in the U.S. lab or Destiny on the International Space Station during the fourth day in space for the Atlantis crew and the second day while the two spacecraft are docked in Earth orbit. Photo credit: NASA

  3. Magnus in US Lab

    NASA Image and Video Library

    2011-07-16

    S135-E-008732 (16 July 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, is pictured in the U.S. lab or Destiny on the International Space Station during the 11th day in space for the four crew members of the STS-135 Atlantis mission. Photo credit: NASA

  4. Site investigation for Magnus

    SciTech Connect

    Semple, R.M.; Rigden, W.J.

    1983-05-01

    In April 1982, BP's Magnus structure was installed about 150 km northeast of the Shetland Islands. The most northerly, deepest water platform in the North Sea, the steel tower is supported on groups of 2 m diameter piles that were driven, in good accordance with predictions, to an average penetration of 85 m in strong cohesive soils. The paper describes investigations performed at the platform site, and documents soil characteristics for conventional and state of the art pile analyses. Reference is made to several innovative techniques first used at the Magnus site that have since been incorporated into the larger North Sea investigations. Information is given about the geological history of the site. Test results are presented on soil strength and stiffness, including critical state soil mechanics parameters, on residual pore pressures after sampling, and on the effect of sample size on strength characteristics.

  5. Rotary and Magnus balances

    NASA Technical Reports Server (NTRS)

    Malcolm, G. N.

    1981-01-01

    Two wind tunnel techniques for determining part of the aerodynamic information required to describe the dynamic bahavior of various types of vehicles in flight are described. Force and moment measurements are determined with a rotary-balance apparatus in a coning motion and with a Magnus balance in a high-speed spinning motion. Coning motion is pertinent to both aircraft and missiles, and spinning is important for spin stabilized missiles. Basic principles of both techniques are described, and specific examples of each type of apparatus are presented. Typical experimental results are also discussed.

  6. Magnus Hirschfeld in Greece.

    PubMed

    Vyras, P

    1997-01-01

    In 1932 Magnus Hirschfeld, the eminent German sexologist, visited Greece. It was after a long journey that took him round the world, lecturing about the new science he had created. In the Greek capital his unconventional theories concerning an intermediate "third sex" and his ideas about sexual reform became the object of an attack in the local press. Close examination of the debate which followed reveals some interesting points regarding Hirschfeld's approach to publicity and his attempts to foster an emancipation movement for homosexual issues.

  7. Rotary and Magnus balances

    NASA Technical Reports Server (NTRS)

    Malcolm, G. N.

    1981-01-01

    Two wind tunnel techniques for determining part of the aerodynamic information required to describe the dynamic bahavior of various types of vehicles in flight are described. Force and moment measurements are determined with a rotary-balance apparatus in a coning motion and with a Magnus balance in a high-speed spinning motion. Coning motion is pertinent to both aircraft and missiles, and spinning is important for spin stabilized missiles. Basic principles of both techniques are described, and specific examples of each type of apparatus are presented. Typical experimental results are also discussed.

  8. Magnus effect power generator

    SciTech Connect

    Borg, J.L.; Borg, C.J.

    1984-05-01

    Magnus cylinders are mounted for rotation at right angles to shafts that are revolved about a generally vertical axis. The shafts are free to rotate 180/sup 0/. The Magnus cylinders are continuously rotated in the same angular direction. At one position of revolution of the shafts, the cylinders rotate on an axis generally parallel to the axis of revolution of the shafts. When the apparatus is immersed in a fluid flow (gaseous or liquid) a torque of rotation is developed when the shafts are aligned with the fluid flow, and this torque of rotation is reduced as the shaft approaches a position transverse to the fluid flow. As the shafts pass this transverse position, a torque is developed by the rotating cylinder that rotates the shafts 180/sup 0/ until the formerly downwardly depending cylinder is now upright and the formerly upright cylinder is now downwardly depending on its shaft. With two or more shafts to which cylinders are attached, there is a continuous production of torque about the axis of revolution of the shafts.

  9. Magnus air turbine system

    DOEpatents

    Hanson, Thomas F.

    1982-01-01

    A Magnus effect windmill for generating electrical power is disclosed. A large nacelle-hub mounted pivotally (in Azimuth) atop a support tower carries, in the example disclosed, three elongated barrels arranged in a vertical plane and extending symmetrically radially outwardly from the nacelle. The system provides spin energy to the barrels by internal mechanical coupling in the proper sense to cause, in reaction to an incident wind, a rotational torque of a predetermined sense on the hub. The rotating hub carries a set of power take-off rollers which ride on a stationary circular track in the nacelle. Shafts carry the power, given to the rollers by the wind driven hub, to a central collector or accumulator gear assembly whose output is divided to drive the spin mechanism for the Magnus barrels and the main electric generator. A planetary gear assembly is interposed between the collector gears and the spin mechanism functioning as a differential which is also connected to an auxiliary electric motor whereby power to the spin mechanism may selectively be provided by the motor. Generally, the motor provides initial spin to the barrels for start-up after which the motor is braked and the spin mechanism is driven as though by a fixed ratio coupling from the rotor hub. During high wind or other unusual conditions, the auxiliary motor may be unbraked and excess spin power may be used to operate the motor as a generator of additional electrical output. Interposed between the collector gears of the rotating hub and the main electric generator is a novel variable speed drive-fly wheel system which is driven by the variable speed of the wind driven rotor and which, in turn, drives the main electric generator at constant angular speed. Reference is made to the complete specification for disclosure of other novel aspects of the system such as, for example, the aerodynamic and structural aspects of the novel Magnus barrels as well as novel gearing and other power coupling

  10. Kimbrough and Magnus on MDDK

    NASA Image and Video Library

    2008-11-16

    S126-E-007618 (16 Nov. 2008) --- Astronauts Shane Kimbrough and Sandra Magnus, both STS-126 mission specialists, are pictured with fresh fruit floating freely on the middeck of Space Shuttle Endeavour during flight day three activities.

  11. A note on Magnus formula

    NASA Astrophysics Data System (ADS)

    Prato, D.; Lamberti, P. W.

    1997-03-01

    In this paper we reanalyze the Magnus formula for the time evolution operator in quantum mechanics from an algorithmic point of view. We give some rules to obtain the general term in the expansion as a compact time-ordered integral. These rules are easily applied to higher orders; in particular, we give explicitly the fifth order.

  12. STS-112 Crew Interviews - Magnus

    NASA Technical Reports Server (NTRS)

    2002-01-01

    STS-112 Mission Specialist 2 Sandra H. Magnus is seen during a prelaunch interview. She answers questions about her inspiration to become an astronaut and her career path. She gives details on the mission's goals, the most significant of which will be the installation of the S-1 truss structure on the International Space Station (ISS). The installation, one in a series of truss extending missions, will be complicated and will require the use of the robotic arm as well as extravehicular activity (EVA) by astronauts. Magnus also describes her function in the performance of transfer operations. Brief descriptions are given of experiments on board the ISS as well as on board the Shuttle.

  13. [Handwritten documents of 'Antidotarius magnus'].

    PubMed

    Kramer, A; Scheidt, K

    1999-01-01

    The 'Antidotarius magnus'--compiled about 1080 by the archbishop of Salerno, Alphanus--deals with the pharmacological methods of healing and contains nearly 1073 antidots. We have discovered 13 Latin manuscripts of the 'Antidotarius magnus' in the libraries of Basel, Bern, Cambridge, Erfurt, Florence, London, Oxford, Paris and Parma. One should remember that the MS Taurin.I.VI.24 had been totally destroyed in 1904, but this manuscript is still noted in the catalogues of Pasin, Giacosa and Thorndike/Kibre. The most remarkable manuscript--the MS Palat.lat.747--is preserved in the National Library at Florence. The MS Palat.lat.747 is dated to 1153 and seems to be similar to the archetype. We are currently preparing a critical edition based on the oldest manuscripts.

  14. STS-112 Crew Interviews - Magnus

    NASA Technical Reports Server (NTRS)

    2002-01-01

    STS-112 Mission Specialist 2 Sandra H. Magnus is seen during a prelaunch interview. She answers questions about her inspiration to become an astronaut and her career path. She gives details on the mission's goals, the most significant of which will be the installation of the S-1 truss structure on the International Space Station (ISS). The installation, one in a series of truss extending missions, will be complicated and will require the use of the robotic arm as well as extravehicular activity (EVA) by astronauts. Magnus also describes her function in the performance of transfer operations. Brief descriptions are given of experiments on board the ISS as well as on board the Shuttle.

  15. Magnus effects on spinning transonic missiles

    NASA Technical Reports Server (NTRS)

    Seginer, A.; Rosenwasser, I.

    1983-01-01

    Magnus forces and moments were measured on a basic-finner model spinning in transonic flow. Spin was induced by canted fins or by full-span or semi-span, outboard and inboard roll controls. Magnus force and moment reversals were caused by Mach number, reduced spin rate, and angle of attack variations. Magnus center of pressure was found to be independent of the angle of attack but varied with the Mach number and model configuration or reduced spin rate.

  16. Magnus effects on spinning transonic missiles

    NASA Technical Reports Server (NTRS)

    Seginer, A.; Rosenwasser, I.

    1983-01-01

    Magnus forces and moments were measured on a basic-finner model spinning in transonic flow. Spin was induced by canted fins or by full-span or semi-span, outboard and inboard roll controls. Magnus force and moment reversals were caused by Mach number, reduced spin rate, and angle of attack variations. Magnus center of pressure was found to be independent of the angle of attack but varied with the Mach number and model configuration or reduced spin rate.

  17. Magnus Configures Raffaello for Ingress

    NASA Image and Video Library

    2011-07-11

    S135-E-007401 (11 July 2011) --- Toting a cargo transfer bag filled with supplies that was carried aboard Raffaello in Atlantis' cargo bay, NASA astronaut Sandy Magnus participates in a very busy move operation on the fourth day in space for the STS-135 crew. She is in Node 2 or Harmony, near the PMA-2 passageway, on the International Space Station. She is sporting the striped socks that she rediscovered on the station which had remained there since her long duration stay on the orbital outpost a few years ago. Photo credit: NASA

  18. Magnus approximation in neutrino oscillations

    NASA Astrophysics Data System (ADS)

    Acero, Mario A.; Aguilar-Arevalo, Alexis A.; D'Olivo, J. C.

    2011-04-01

    Oscillations between active and sterile neutrinos remain as an open possibility to explain some anomalous experimental observations. In a four-neutrino (three active plus one sterile) mixing scheme, we use the Magnus expansion of the evolution operator to study the evolution of neutrino flavor amplitudes within the Earth. We apply this formalism to calculate the transition probabilities from active to sterile neutrinos with energies of the order of a few GeV, taking into account the matter effect for a varying terrestrial density.

  19. Magnus Food Prep in Service Module (SM)

    NASA Image and Video Library

    2009-01-07

    ISS018-E-018423 (7 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, poses for a photo while holding food pouches near the galley in the Zvezda Service Module of the International Space Station.

  20. Magnus force effect in optical manipulation

    NASA Astrophysics Data System (ADS)

    Cipparrone, Gabriella; Hernandez, Raul Josue; Pagliusi, Pasquale; Provenzano, Clementina

    2011-07-01

    The effect of the Magnus force in optical micromanipulation has been observed. An ad hoc experiment has been designed based on a one-dimensional optical trap that carries angular momentum. The observed particle dynamics reveals the occurrence of this hydrodynamic force, which is neglected in the common approach. Its measured value is larger than the one predicted by the existing theoretical models for micrometric particles and low Reynolds number, showing that the Magnus force can contribute to unconventional optohydrodynamic trapping and manipulation.

  1. Magnus force effect in optical manipulation

    SciTech Connect

    Cipparrone, Gabriella; Pagliusi, Pasquale; Hernandez, Raul Josue; Provenzano, Clementina

    2011-07-15

    The effect of the Magnus force in optical micromanipulation has been observed. An ad hoc experiment has been designed based on a one-dimensional optical trap that carries angular momentum. The observed particle dynamics reveals the occurrence of this hydrodynamic force, which is neglected in the common approach. Its measured value is larger than the one predicted by the existing theoretical models for micrometric particles and low Reynolds number, showing that the Magnus force can contribute to unconventional optohydrodynamic trapping and manipulation.

  2. General Education at Albertus Magnus College.

    ERIC Educational Resources Information Center

    Savage, Mary

    An alternative general education program for freshmen at Albertus Magnus College is described. The program, an interdisciplinary student-centered introduction to general education, is composed of two parts that the student takes concurrently: (1) a year-long seminar in thought and expression, and (2) a sequence of four (usually 7-week) courses in…

  3. A Pedagogical Approach to the Magnus Expansion

    ERIC Educational Resources Information Center

    Blanes, S.; Casas, F.; Oteo, J. A.; Ros, J.

    2010-01-01

    Time-dependent perturbation theory as a tool to compute approximate solutions of the Schrodinger equation does not preserve unitarity. Here we present, in a simple way, how the "Magnus expansion" (also known as "exponential perturbation theory") provides such unitary approximate solutions. The purpose is to illustrate the importance and…

  4. A Pedagogical Approach to the Magnus Expansion

    ERIC Educational Resources Information Center

    Blanes, S.; Casas, F.; Oteo, J. A.; Ros, J.

    2010-01-01

    Time-dependent perturbation theory as a tool to compute approximate solutions of the Schrodinger equation does not preserve unitarity. Here we present, in a simple way, how the "Magnus expansion" (also known as "exponential perturbation theory") provides such unitary approximate solutions. The purpose is to illustrate the importance and…

  5. Internal Magnus effects in superfluid 3A

    NASA Astrophysics Data System (ADS)

    Salmelin, R. H.; Salomaa, M. M.; Mineev, V. P.

    1989-08-01

    Orbital angular momentum of the coherently aligned Cooper pairs in superfluid 3A is encountered by an object immersed in the condensate. We evaluate the associated quasiparticle-scattering asymmetry experienced by a negative ion; this leads to a measureable, purely quantum-mechanical reactive force deflecting the ion's trajectory. Possible hydrodynamic Magnus effects are also discussed.

  6. Sandra Magnus Training in ETA Chamber

    NASA Image and Video Library

    2002-06-05

    JSC2002-E-23122 (5 June 2002) --- Astronaut Sandra H. Magnus, STS-112 mission specialist, dons a training version of the Extravehicular Mobility Unit (EMU) space suit prior to a mission training session in the Environmental Test Article (ETA) Chamber in the Crew Systems Laboratory at Johnson Space Center (JSC).

  7. New twist to steering. [Magnus effect rotors

    SciTech Connect

    Borg, J.L.

    1980-06-01

    The new vessel steering system is based on The Magnus Effect which is defined in simplified terms; if a vertical cylinder immersed in water is rotated, it produces a force at right angles to the direction of the water flowing past it. The Magnus Effect rotor needs only sufficient torque to overcome bearing and surface friction forces, so that the power requirements are very low. Further energy savings are realized because the rotor can develop maximum turning force or can return to zero in a few seconds. Tests with these cylindrical rudders have been conducted to verify the hydrodynamic theory. This concept is in the preliminary stages of development. Results are expected soon from field testing on an 1800-hp pushboat working four barges on the Warrior and Tombigbee Rivers in Alabama and Mississippi.

  8. Magnus force in superfluids and superconductors

    NASA Astrophysics Data System (ADS)

    Sonin, E. B.

    1997-01-01

    The forces on the vortex, transverse to its velocity, are considered. In addition to the superfluid Magnus force from the condensate (superfluid component), there are transverse forces from thermal quasiparticles and external fields violating the Galilean invariance. The forces between quasiparticles and the vortex originate from interference of quasiparticles with trajectories on the left and on the right from the vortex like similar forces for electrons interacting with the thin magnetic-flux tube (the Aharonov-Bohm effect). These forces are derived for phonons from the equations of superfluid hydrodynamics, and for BCS quasiparticles from the Bogolyubov-de Gennes equations. The effect of external fields breaking Galilean invariance is analyzed for vortices in the two-dimensional Josephson junction array. The symmetry analysis of the classical equations for the array shows that the total transverse force on the vortex vanishes. Therefore the Hall effect which is linear in the transverse force is absent also. This means that the Magnus force from the superfluid component exactly cancels with the transverse force from the external fields. The results of other approaches are also brought together for discussion.

  9. Inverse Magnus effect on a rotating sphere

    NASA Astrophysics Data System (ADS)

    Kim, Jooha; Park, Hyungmin; Choi, Haecheon; Yoo, Jung Yul

    2011-11-01

    In this study, we investigate the flow characteristics of rotating spheres in the subcritical Reynolds number (Re) regime by measuring the drag and lift forces on the sphere and the two-dimensional velocity in the wake. The experiment is conducted in a wind tunnel at Re = 0 . 6 ×105 - 2 . 6 ×105 and the spin ratio (ratio of surface velocity to the free-stream velocity) of 0 (no spin) - 0.5. The drag coefficient on a stationary sphere remains nearly constant at around 0.52. However, the magnitude of lift coefficient is nearly zero at Re < 2 . 0 ×105 , but rapidly increases to 0.3 and then remains constant with further increasing Reynolds number. On the other hand, with rotation, the lift coefficient shows negative values, called inverse Magnus effect, depending on the magnitudes of the Reynolds number and spin ratio. The velocity field measured from a particle image velocimetry (PIV) indicates that non-zero lift coefficient on a stationary sphere at Re > 2 . 0 ×105 results from the asymmetry of separation line, whereas the inverse Magnus effect for the rotating sphere results from the differences in the boundary-layer growth and separation along the upper and lower sphere surfaces. Supported by the WCU, Converging Research Center and Priority Research Centers Program, NRF, MEST, Korea.

  10. Magnus force in superfluids and superconductors

    SciTech Connect

    Sonin, E.B. |

    1997-01-01

    The forces on the vortex, transverse to its velocity, are considered. In addition to the superfluid Magnus force from the condensate (superfluid component), there are transverse forces from thermal quasiparticles and external fields violating the Galilean invariance. The forces between quasiparticles and the vortex originate from interference of quasiparticles with trajectories on the left and on the right from the vortex like similar forces for electrons interacting with the thin magnetic-flux tube (the Aharonov-Bohm effect). These forces are derived for phonons from the equations of superfluid hydrodynamics, and for BCS quasiparticles from the Bogolyubov{endash}de Gennes equations. The effect of external fields breaking Galilean invariance is analyzed for vortices in the two-dimensional Josephson junction array. The symmetry analysis of the classical equations for the array shows that the total transverse force on the vortex vanishes. Therefore the Hall effect which is linear in the transverse force is absent also. This means that the Magnus force from the superfluid component {ital exactly} cancels with the transverse force from the external fields. The results of other approaches are also brought together for discussion. {copyright} {ital 1997} {ital The American Physical Society}

  11. Unravelling the structure of Magnus' pink salt.

    PubMed

    Lucier, Bryan E G; Johnston, Karen E; Xu, Wenqian; Hanson, Jonathan C; Senanayake, Sanjaya D; Yao, Siyu; Bourassa, Megan W; Srebro, Monika; Autschbach, Jochen; Schurko, Robert W

    2014-01-29

    A combination of multinuclear ultra-wideline solid-state NMR, powder X-ray diffraction (pXRD), X-ray absorption fine structure experiments, and first principles calculations of platinum magnetic shielding tensors has been employed to reveal the previously unknown crystal structure of Magnus' pink salt (MPS), [Pt(NH3)4][PtCl4], study the isomeric Magnus' green salt (MGS), [Pt(NH3)4][PtCl4], and examine their synthetic precursors K2PtCl4 and Pt(NH3)4Cl2·H2O. A simple synthesis of MPS is detailed which produces relatively pure product in good yield. Broad (195)Pt, (14)N, and (35)Cl SSNMR powder patterns have been acquired using the WURST-CPMG and BRAIN-CP/WURST-CPMG pulse sequences. Experimentally measured and theoretically calculated platinum magnetic shielding tensors are shown to be very sensitive to the types and arrangements of coordinating ligands as well as intermolecular Pt-Pt metallophilic interactions. High-resolution (195)Pt NMR spectra of select regions of the broad (195)Pt powder patterns, in conjunction with an array of (14)N and (35)Cl spectra, reveal clear structural differences between all compounds. Rietveld refinements of synchrotron pXRD patterns, guided by first principles geometry optimization calculations, yield the space group, unit cell parameters, and atomic positions of MPS. The crystal structure has P-1 symmetry and resides in a pseudotetragonal unit cell with a distance of >5.5 Å between Pt sites in the square-planar Pt units. The long Pt-Pt distances and nonparallel orientation of Pt square planes prohibit metallophilic interactions within MPS. The combination of ultra-wideline NMR, pXRD, and computational methods offers much promise for future investigation and characterization of Pt-containing systems.

  12. Magnus Effect on a Spinning Satellite in Low Earth Orbit

    NASA Technical Reports Server (NTRS)

    Ramjatan, Sahadeo; Fitz-Coy, Norman; Yew, Alvin Garwai

    2016-01-01

    A spinning body in a flow field generates an aerodynamic lift or Magnus effect that displaces the body in a direction normal to the freestream flow. Earth orbiting satellites with substantial body rotation in appreciable atmospheric densities may generate a Magnus force to perturb orbital dynamics. We investigate the feasibility of using this effect for spacecraft at a perigee of 80km using the Systems Tool Kit (STK). Results show that for a satellite of reasonable properties, the Magnus effect doubles the amount of time in orbit. Orbital decay was greatly mitigated for satellites spinning at 10000 and 15000RPM. This study demonstrates that the Magnus effect has the potential to sustain a spacecraft's orbit at a low perigee altitude and could also serve as an orbital maneuver capability.

  13. Magnus Forces and Statistics in 2 + 1 Dimensions

    NASA Astrophysics Data System (ADS)

    Davis, R. L.

    Spinning vortex solutions to the abelian Higgs model, not Nielsen-Olesen solutions, are appropriate to a Ginzburg-Landau description of superconductivity. The main physical distinction is that spinning vortices experience the Magnus force while Nielsen-Olesen vortices do not. In 2 + 1 dimensional superconductivity without a Chern-Simons interaction, the effect of the Magnus force is equivalent to that of a background fictitious magnetic field. Moreover, the phase obtained an interchanging two quasi-particles is always path-dependent. When a Chern-Simons term is added there is an additional localized Magnus flux at the vortex. For point-like vortices, the Chern-Simons interaction can be seen as defining their intrinsic statistics, but in realistic cases of vortices with finite size in strong Magnus fields the quasi-particle statistics are not well-defined.

  14. ISS Expedition 18 Lonchakov and Magnus in Service Module (SM)

    NASA Image and Video Library

    2009-02-03

    ISS018-E-027211 (3 Feb. 2009) --- Astronaut Sandra Magnus and cosmonaut Yury Lonchakov, both Expedition 18 flight engineers, works with food storage containers in the Zvezda Service Module of the International Space Station.

  15. Magnus forces and statistics in 2 + 1 dimensions

    SciTech Connect

    Davis, R.L. )

    1990-05-10

    Spinning vortex solutions to the abelian Higgs model, not Nielsen-Olesen solutions, are appropriate to a Ginzburg-Landau description of superconductivity. The main physical distinction is that spinning vortices experience the Magnus force while Nielsen-Olesen vortices do not. In 2 + 1 dimensional superconductivity without a Chern-Simons interaction, the effect of the Magnus force is equivalent to that of a background fictitious magnetic field. Moreover, the phase obtained an interchanging two quasi-particles is always path-dependent. When a Chern-Simons term is added there is an additional localized Magnus flux at the vortex. For point-like vortices, the Chern-Simons interaction can be seen as defining their intrinsic statistics, but in realistic cases of vortices with finite size in strong Magnus fields the quasi-particle statistics are not well-defined.

  16. The Magnus Effect in Theory and in Reality

    NASA Technical Reports Server (NTRS)

    Ahlborn, F

    1930-01-01

    A discussion of the Flettner rotor is presented from a nautical and economic viewpoint, and although it was a failure, the experimental and theoretical inventions cannot be disregarded. The following critical and experimental investigation will show the relations and applicability of the theories and practical applications. The Magnus effect is described in detail and a discussion and critical review of the Magnus effect is included.

  17. Internal Magnus effects in superfluid 3He-A

    NASA Astrophysics Data System (ADS)

    Salmelin, R. H.; Salomaa, M. M.; Mineev, V. P.

    The orbital angular momentum of the coherently aligned Cooper pairs in superfluid (3)He-A is transmitted to an object immersed in the condensate. The authors evaluate the quasiparticle-scattering asymmetry experienced by a negative ion; this leads to a measurable, purely quantum-mechanical Magnus force deflecting the ion's trajectory. Close to T(sub c), possible hydrodynamic Magnus effects are smaller by the factor delta sub A/(k sub B)(T sub c).

  18. Magnus force in discrete and continuous two-dimensional superfluids

    SciTech Connect

    Gecse, Z.; Khlebnikov, S.

    2005-08-01

    Motion of vortices in two-dimensional superfluids in the classical limit is studied by solving the Gross-Pitaevskii equation numerically on a uniform lattice. We find that, in the presence of a superflow directed along one of the main lattice periods, vortices move with the superflow on fine lattices but perpendicular to it on coarse ones. We interpret this result as a transition from the full Magnus force in a Galilean-invariant limit to vanishing effective Magnus force in a discrete system, in agreement with the existing experiments on vortex motion in Josephson junction arrays.

  19. STS-112 M.S. Magnus suits up for launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. --STS-112 Mission Specialist Sandra Magnus dons her spacesuit for a final fit check in preparation for her launch to the International Space Station aboard Atlantis. Launch is scheduled for Oct. 2 between 2 and 6 p.m. EDT.

  20. STS-112 M.S. Magnus suits up for launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. --STS-112 Mission Specialist Sandra Magnus dons her space helmet for a final fit check in preparation for her launch to the International Space Station aboard Atlantis. Launch is scheduled for Oct. 2 between 2 and 6 p.m. EDT.

  1. Internal Magnus effects in superfluid sup 3 He- A

    SciTech Connect

    Salmelin, R.H.; Salomaa, M.M. ); Mineev, V.P.

    1989-08-21

    Orbital angular momentum of the coherently aligned Cooper pairs in superfluid {sup 3}He-{ital A} is encountered by an object immersed in the condensate. We evaluate the associated quasiparticle-scattering asymmetry experienced by a negative ion; this leads to a measureable, purely quantum-mechanical reactive force deflecting the ion's trajectory. Possible hydrodynamic Magnus effects are also discussed.

  2. STS-112 M.S. Magnus suits up for launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. --STS-112 Mission Specialist Sandra Magnus dons her space helmet for a final fit check in preparation for her launch to the International Space Station aboard Atlantis. Launch is scheduled for Oct. 2 between 2 and 6 p.m. EDT.

  3. STS-112 M.S. Magnus suits up for launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. --STS-112 Mission Specialist Sandra Magnus dons her spacesuit for a final fit check in preparation for her launch to the International Space Station aboard Atlantis. Launch is scheduled for Oct. 2 between 2 and 6 p.m. EDT.

  4. Describing neutrino oscillations in matter with Magnus expansion

    NASA Astrophysics Data System (ADS)

    Ioannisian, A. N.; Smirnov, A. Yu.

    2009-07-01

    We present new formalism for description of the neutrino oscillations in matter with varying density. The formalism is based on the Magnus expansion and has a virtue that the unitarity of the S-matrix is maintained in each order of perturbation theory. We show that the Magnus expansion provides better convergence of series: the restoration of unitarity leads to smaller deviations from the exact results especially in the regions of large transition probabilities. Various expansions are obtained depending on a basis of neutrino states and a way one splits the Hamiltonian into the self-commuting and non-commuting parts. In particular, we develop the Magnus expansion for the adiabatic perturbation theory which gives the best approximation. We apply the formalism to the neutrino oscillations in matter of the Earth and show that for the solar oscillation parameters the second order Magnus adiabatic expansion has better than 1% accuracy for all energies and trajectories. For the atmospheric Δm and small 1-3 mixing the approximation works well (<3% accuracy for sinθ=0.01) outside the resonance region 2.7-8 GeV.

  5. The "Magnus effect" - the principle of the Flettner rotor

    NASA Technical Reports Server (NTRS)

    Betz, A

    1925-01-01

    The phenomenon of the Magnus effect consists in the fact that a revolving body moving relatively to the surrounding fluid (air) is subjected not only to drag (i.e., a force acting in a direction opposite to that of the direction of motion), but also to a lift.

  6. Magnus expansion and in-medium similarity renormalization group

    NASA Astrophysics Data System (ADS)

    Morris, T. D.; Parzuchowski, N. M.; Bogner, S. K.

    2015-09-01

    We present an improved variant of the in-medium similarity renormalization group (IM-SRG) based on the Magnus expansion. In the new formulation, one solves flow equations for the anti-Hermitian operator that, upon exponentiation, yields the unitary transformation of the IM-SRG. The resulting flow equations can be solved using a first-order Euler method without any loss of accuracy, resulting in substantial memory savings and modest computational speedups. Since one obtains the unitary transformation directly, the transformation of additional operators beyond the Hamiltonian can be accomplished with little additional cost, in sharp contrast to the standard formulation of the IM-SRG. Ground state calculations of the homogeneous electron gas (HEG) and 16O nucleus are used as test beds to illustrate the efficacy of the Magnus expansion.

  7. Numerical simulation of negative Magnus force on a rotating sphere

    NASA Astrophysics Data System (ADS)

    Muto, Masaya; Tsubokura, Makoto; Oshima, Nobuyuki

    2010-11-01

    Flow characteristics and fluid force on a sphere rotating along with axis perpendicular to mean air flow were investigated using Large Eddy Simulation at two different Reynolds numbers of 10,000 and 200,000. As a result of simulation, opposite flow characteristics around the sphere and displacement of the separation point were visualized depending on the Reynolds number even though the sphere rotates at the same rotation speed according to the Reynolds number. When Reynolds number is 10,000, flow characteristics agree with the flow field explained in the Magnus effect. However sphere rotates at the same rotation speed while increasing Reynolds number to 200,000, separation point moves in opposite direction and wake appears in the different direction. The reason of the negative Magnus force was discussed in terms of the boundary layer transition on the surface.

  8. A review of the Magnus effect in aeronautics

    NASA Astrophysics Data System (ADS)

    Seifert, Jost

    2012-11-01

    The Magnus effect is well-known for its influence on the flight path of a spinning ball. Besides ball games, the method of producing a lift force by spinning a body of revolution in cross-flow was not used in any kind of commercial application until the year 1924, when Anton Flettner invented and built the first rotor ship Buckau. This sailboat extracted its propulsive force from the airflow around two large rotating cylinders. It attracted attention wherever it was presented to the public and inspired scientists and engineers to use a rotating cylinder as a lifting device for aircraft. This article reviews the application of Magnus effect devices and concepts in aeronautics that have been investigated by various researchers and concludes with discussions on future challenges in their application.

  9. A new 5-alkylresorcinol glucoside derivative from Cybianthus magnus.

    PubMed

    Cabanillas, B; Vásquez-Ocmín, P; Zebiri, I; Rengifo, E; Sauvain, M; Le, H L; Vaisberg, A; Voutquenne-Nazabadioko, L; Haddad, M

    2016-01-01

    One new 5-alkylresorcinol glucoside (1) was isolated from leaves of Cybianthus magnus, along with 12 known compounds (2-13), isolated from four plants belonging to Myrsinaceae family. Their structures were determined on the basis of spectroscopic analysis and by comparison of their spectral data with those reported in the literature. Among the tested molecules, only compound 2 displayed a strong cytotoxic activity with IC50 values ranging between 22 and 100 μM for all cell lines tested. One new 5-alkylresorcinol glucoside (1) was isolated from leaves of Cybianthus magnus, along with 12 known compounds, isolated from four plants belonging to Myrsinaceae family (2, 3 isolated from C. magnus; 4-7, 10 and 11 isolated from Myrsine latifolia; 4, 8 and 9 isolated from Myrsine sessiflora; 6, 7, 10, 12 and 13 isolated from Myrsine congesta). Their structures were determined on the basis of spectroscopic analysis and by comparison of their spectral data with those reported in the literature. So far, only nine 5-alkylresorcinol glucosides were isolated from leaves of Grevillea robusta. Since resorcinols are known to exhibit strong cytotoxic activity, compounds 1 and 2 were tested against cell lines 3T3, H460, DU145 and MCF-7 for cytotoxicity in vitro and compounds 3-13 were tested for their antileishmanial activity. Compound 2 displayed a strong cytotoxic activity with IC50 values ranging between 22 and 100 μM for all tested cell lines. Compounds 3-13 were not active against Leishmania amazonensis amastigotes.

  10. Magnus effects at high angles of attack and critical Reynolds numbers

    NASA Technical Reports Server (NTRS)

    Seginer, A.; Ringel, M.

    1983-01-01

    The Magnus force and moment experienced by a yawed, spinning cylinder were studied experimentally in low speed and subsonic flows at high angles of attack and critical Reynolds numbers. Flow-field visualization aided in describing a flow model that divides the Magnus phenomenon into a subcritical region, where reverse Magnus loads are experienced, and a supercritical region where these loads are not encountered. The roles of the spin rate, angle of attack, and crossflow Reynolds number in determining the boundaries of the subcritical region and the variations of the Magnus loads were studied.

  11. Magnus effects at high angles of attack and critical Reynolds numbers

    NASA Technical Reports Server (NTRS)

    Seginer, A.; Ringel, M.

    1983-01-01

    The Magnus force and moment experienced by a yawed, spinning cylinder were studied experimentally in low speed and subsonic flows at high angles of attack and critical Reynolds numbers. Flow-field visualization aided in describing a flow model that divides the Magnus phenomenon into a subcritical region, where reverse Magnus loads are experienced, and a supercritical region where these loads are not encountered. The roles of the spin rate, angle of attack, and crossflow Reynolds number in determining the boundaries of the subcritical region and the variations of the Magnus loads were studied.

  12. Optical Magnus effect in metamaterials fabricated from ferromagnetic microwires

    NASA Astrophysics Data System (ADS)

    Ivanov, A. V.; Shalygin, A. N.; Vedyaev, A. V.; Ivanov, V. A.

    2007-08-01

    In homogeneous negative phase velocity media, the Doppler and Cherenkov-Vavilov effects and the refraction and pressure of light are anomalous: they are inverse with respect to the corresponding effects in conventional media. Using the geometrical optics approximation, it is shown that the optical Magnus effect in inhomogeneous negative phase velocity media is also anomalous. The effect is demonstrated by considering a metamaterial consisting of parallel amorphous ferromagnetic microwires in a magnetic field. The metamaterial proves to be a left-handed one in the realistic region of the electromagnetic spectrum. The optical properties of such a left-handed medium can be controlled by the external magnetic field.

  13. STS-112 M.S. Magnus suits up before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- STS-112 Mission Specialist Sandra Magnus finishes suiting up before launch. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss to the Station. Launch is scheduled for 3:46 p.m. EDT from Launch Pad 39B.

  14. [Magnus Hirschfeld and monism: mutual fertilization or exchange of errors?].

    PubMed

    Mildenberger, Florian

    2007-01-01

    When Ernst Haeckel was buried in Jena on February 12th, 1919, some of his supporters and followers were allowed to make speeches. One of them was the sexologist Magnus Hirschfeld, although he had entered the German-Monist-Club only six years after its foundation in 1906. He became one of the most important monists, because he worked in the fields of sexuality and eugenics, and was head of discourse for many years. But he imported some ideas of his colleagues for his own studies, especially the neolamarckism. The failure of this theory had decisive consequences for monism and sexology, as well.

  15. STS-112 M.S. Magnus suits up before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- STS-112 Mission Specialist Sandra Magnus finishes suiting up before launch. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss to the Station. Launch is scheduled for 3:46 p.m. EDT from Launch Pad 39B.

  16. A Magnus Expansion Analysis of Frequency-Dependent Mueller Matrices

    NASA Astrophysics Data System (ADS)

    Reimer, Michael; Yevick, David

    2006-03-01

    We have recently demonstrated that, for any physical system characterized by a non-singular, frequency dependent Jones matrix, the frequency evolution of the corresponding Mueller matrix is described by a differential equation whose general solution can be compactly formulated through the Magnus expansion [M. Reimer, D. Yevick, and D. Dumas, submitted to J. Opt. Soc. Am. A, Photon. Technol. Lett.]. [D. Yevick, T. Lu, W. Huang and W. Bardyszewski to be published in J. Opt. Soc. Am. A]. We subsequently applied our analytic results to optical compensators for communications networks and to the estimation of a system's frequency dependent Mueller matrix based on repeated measurements of the output state of polarization for randomly generated input polarization states [M. Reimer, D. Yevick and D. Dumas, submitted to Photon. Technol. Lett.]. We have also incorporated the Magnus expansion into a Clifford algebra description of polarization evolution. This procedure reformulates numerous physical transformations in a simple and transparent manner [M. Reimer and D. Yevick, submitted to Photon. Technol. Lett.].

  17. Numerical analysis of the Magnus moment on a spin-stabilized projectile

    NASA Astrophysics Data System (ADS)

    Cremins, Michael; Rodebaugh, Gregory; Verhulst, Claire; Benson, Michael; van Poppel, Bret

    2016-11-01

    The Magnus moment is a result of an uneven pressure distribution that occurs when an object rotates in a crossflow. Unlike the Magnus force, which is often small for spin-stabilized projectiles, the Magnus moment can have a strong detrimental effect on flight stability. According to one source, most transonic and subsonic flight instabilities are caused by the Magnus moment [Modern Exterior Ballistics, McCoy], and yet simulations often fail to accurately predict the Magnus moment in the subsonic regime. In this study, we present hybrid Reynolds Averaged Navier Stokes (RANS) and Large Eddy Simulation (LES) predictions of the Magnus moment for a spin-stabilized projectile. Velocity, pressure, and Magnus moment predictions are presented for multiple Reynolds numbers and spin rates. We also consider the effect of a sting mount, which is commonly used when conducting flow measurements in a wind tunnel or water channel. Finally, we present the initial designs for a novel Magnetic Resonance Velocimetry (MRV) experiment to measure three-dimensional flow around a spinning projectile. This work was supported by the Department of Defense High Performance Computing Modernization Program (DoD HPCMP).

  18. Vacancy-rearrangement theory in the first Magnus approximation

    SciTech Connect

    Becker, R.L.

    1984-01-01

    In the present paper we employ the first Magnus approximation (M1A), a unitarized Born approximation, in semiclassical collision theory. We have found previously that the M1A gives a substantial improvement over the first Born approximation (B1A) and can give a good approximation to a full coupled channels calculation of the mean L-shell vacancy probability per electron, p/sub L/, when the L-vacancies are accompanied by a K-shell vacancy (p/sub L/ is obtained experimentally from measurements of K/sub ..cap alpha../-satellite intensities). For sufficiently strong projectile-electron interactions (sufficiently large Z/sub p/ or small v) the M1A ceases to reproduce the coupled channels results, but it is accurate over a much wider range of Z/sub p/ and v than the B1A. 27 references.

  19. Three-dimensional magnetic engineering: The programs magnus and epilog

    NASA Astrophysics Data System (ADS)

    Fan, Mingwu; Pissanetzky, Sergio

    1988-10-01

    We present the post-processor EPILOG for the well established finite element program MAGNUS for three-dimensional magnetic engineering. MAGNUS solves problems of magnetostatics with nonlinear magnetic materials, permanent magnets and electric currents, for any 3-D geometry. The two-scalar-potentials formulation of magnetostatics used by MAGNUS combines numerical accuracy and computational efficiency, and is considered state of the art. The well known program KUBIK is used as a pre-processor to describe the geometry and finite element mesh. KUBIK is highly interactive and allows the user to effectively control all geometric details. The needs of magnetic engineers, however, go far beyond the simple availability of a mathematical solution. Once the solution has been obtained by MAGNUS in the form of a continuous magnetic scalar potential function defined at every point in the solution domain, those needs are met by EPILOG. EPILOG is command operated. Commands are independent of each other and can be used in any order, or not used at all. The purpose of each command is to use the solution for the calculation of a derived quantity or the production of a plot or table. The following derived quantities can be obtained: the magnetic energy in specific regions, the magnetic force on specified conductors in space, the magnetic torque on specified conductors, the magnetic flux across a given surface in space, the inductance of a circuit, and a variety of line integrals for specified lines in space. A useful facility is the automatic calculation of harmonic multipoles averaged along the beam direction for accelerator magnets, essential for end analysis and the integral effect of the magnetic field on the beam. Graphical facilities include color plots of the shapes of the conductors, the geometry, field lines and surfaces of constant magnetic scalar potential in specified regions of space. EPILOG produces a device independent graphical metafile, which can be seen on any device

  20. Drift of suspended ferromagnetic particles due to the Magnus effect

    NASA Astrophysics Data System (ADS)

    Denisov, S. I.; Pedchenko, B. O.

    2017-01-01

    A minimal system of equations is introduced and applied to study the drift motion of ferromagnetic particles suspended in a viscous fluid and subjected to a time-periodic driving force and a nonuniformly rotating magnetic field. It is demonstrated that the synchronized translational and rotational oscillations of these particles are accompanied by their drift in a preferred direction, which occurs under the action of the Magnus force. We calculate both analytically and numerically the drift velocity of particles characterized by single-domain cores and nonmagnetic shells and show that there are two types of drift, unidirectional and bidirectional, which can be realized in suspensions composed of particles with different core-shell ratios. The possibility of using the phenomenon of bidirectional drift for the separation of core-shell particles in suspensions is also discussed.

  1. ISS Expedition 18 Magnus in Service Module (SM) talks with students via amateur radio

    NASA Image and Video Library

    2008-12-09

    ISS018-E-011703 (9 Dec. 2008) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, uses a communication system while holding a checklist in the Zvezda Service Module of the International Space Station.

  2. ISS Expedition 18 Sandra Magnus in Service Module (SM) with cameras

    NASA Image and Video Library

    2009-02-09

    ISS018-E-029162 (9 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, smiles for a photo while holding two still cameras in the Zvezda Service Module of the International Space Station.

  3. Why adductor magnus muscle is large: the function based on muscle morphology in cadavers.

    PubMed

    Takizawa, M; Suzuki, D; Ito, H; Fujimiya, M; Uchiyama, E

    2014-02-01

    The aim of this study was to examine anatomical properties of the adductor magnus through a detailed classification, and to hypothesize its function and size to gather enough information about morphology. Ten cadaveric specimens of the adductor magnus were used. The muscle was separated into four portios (AM1-AM4) based on the courses of the corresponding perforating arteries, and its volume, muscle length, muscle fiber length and physiological cross-sectional area were assessed. The architectural characteristics of these four portions of the adductor magnus were then classified with the aid of principal component analysis. The results led us into demarcating the most proximal part of the adductor magnus (AM1) from the remaining parts (AM2, AM3, and AM4). Classification of the adductor magnus in terms of architectural characteristics differed from the more traditional anatomical distinction. The AM2, AM3, and AM4, having longer muscle fiber lengths than the AM1, appear to be designed as displacers for moving the thigh through a large range of motion. The AM1 appears instead to be oriented principally toward stabilizing the hip joint. The large mass of the adductor magnus should thus be regarded as a complex of functionally differentiable muscle portions. © 2012 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  4. Role of transverse-momentum currents in the optical Magnus effect in free space

    SciTech Connect

    Luo Hailu; Wen Shuangchun; Shu Weixing; Fan Dianyuan

    2010-05-15

    We establish a general vector field model to describe the role of transverse-momentum currents in the optical Magnus effect in free space. As an analogy of the mechanical Magnus effect, the circularly polarized wave packet in our model acts as the rotating ball, and its rotation direction depends on the polarization state. Based on this model, we demonstrate the existence of an optical polarization-dependent Magnus effect which is significantly different from the conventional optical Magnus effect in that light-matter interaction is not required. Further, we reveal the relation between transverse-momentum currents and the optical Magnus effect, and find that such a polarization-dependent rotation is unavoidable when the wave packet possesses transverse-momentum currents. The physics underlying this intriguing effect is the combined contributions of transverse spin and orbital currents. We predict that this effect may be observed experimentally even in the propagation direction. These findings provide further evidence for the optical Magnus effect in free space and can be extrapolated to other physical systems.

  5. Origin of the Magnus force on a vortex in fermion superfluids and superconductors

    SciTech Connect

    Simanek, E.

    1995-10-01

    Starting from the time-dependent version of the Feynman-Hellmann theorem, the Magnus force acting on a vortex in fermion superfluid is expressed via the adiabatic curvature over the space of vortex positions. With use of the Bogoliubov--de Gennes approximation, the Magnus force in a homogeneous superfluid at {ital T}=0 is shown to originate from virtual transitions between the lowest quasiparticle core bound states. Nonadiabatic corrections to the curvature are obtained to second order in vortex velocity. The adiabatic approximation is shown to break down at a critical velocity equal to the vortex velocity in the first Landau level. The effect of elastic scattering on the Magnus force is discussed in terms of the relaxation-time approximation. It is suggested that this approximation is appropriate only for a large-scale vortex motion. In this case, the effective Magnus force is drastically reduced when the elastic-scattering rate exceeds the core excitation frequency. We conjecture that quantum vortex tunneling is governed by a local Magnus force obtained from the Berry phase approach.

  6. Asymmetry of the Venus nightside ionosphere: Magnus force effects

    NASA Astrophysics Data System (ADS)

    Pérez-de-Tejada, H.

    2008-11-01

    A study of the dawn-dusk asymmetry of the Venus nightside ionosphere is conducted by examining the configuration of the ionospheric trans-terminator flow around Venus and also the dawn-ward displacement of the region where most of the ionospheric holes and the electron density plateau profiles are observed (dawn meaning the west in the retrograde rotation of Venus and that corresponds to the trailing side in its orbital motion). The study describes the position of the holes and the density plateau profiles which occur at neighboring locations in a region that is scanned as the trajectory of the Pioneer Venus Orbiter (PVO) sweeps through the nightside hemisphere with increasing orbit number. The holes are interpreted as crossings through plasma channels that extend downstream from the magnetic polar regions of the Venus ionosphere and the plateau profiles represent cases in which the electron density maintains nearly constant values in the upper ionosphere along the PVO trajectory. From a collection of PVO passes in which these profiles were observed it is found that they appear at neighboring positions of the ionospheric holes in a local solar time (LST) map including cases where only a density plateau profile or an ionospheric hole was detected. It is argued that the ionospheric holes and the density plateau profiles have a common origin at the magnetic polar regions where plasma channels are formed and that the density plateau profiles represent crossings through a friction layer that is adjacent to the plasma channels. It is further suggested that the dawn-dusk asymmetry in the position of both features in the nightside ionosphere results from a fluid dynamic force (Magnus force) that is produced by the combined effects of the trans-terminator flow and the rotational motion of the ionosphere that have been inferred from the PVO measurements.

  7. Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

    DOE PAGES

    Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

    2015-07-31

    We show using numerical simulations that pronounced ratchet effects can occur for ac driven skyrmions moving over asymmetric quasi-one-dimensional substrates. We find a new type of ratchet effect called a Magnus-induced transverse ratchet that arises when the ac driving force is applied perpendicular rather than parallel to the asymmetry direction of the substrate. This transverse ratchet effect only occurs when the Magnus term is finite, and the threshold ac amplitude needed to induce it decreases as the Magnus term becomes more prominent. Ratcheting skyrmions follow ordered orbits in which the net displacement parallel to the substrate asymmetry direction is quantized.more » As a result, skyrmion ratchets represent a new ac current-based method for controlling skyrmion positions and motion for spintronic applications.« less

  8. Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

    NASA Astrophysics Data System (ADS)

    Reichhardt, C.; Ray, D.; Olson Reichhardt, C. J.

    2015-07-01

    We show using numerical simulations that pronounced ratchet effects can occur for ac driven skyrmions moving over asymmetric quasi-one-dimensional substrates. We find a new type of ratchet effect called a Magnus-induced transverse ratchet that arises when the ac driving force is applied perpendicular rather than parallel to the asymmetry direction of the substrate. This transverse ratchet effect only occurs when the Magnus term is finite, and the threshold ac amplitude needed to induce it decreases as the Magnus term becomes more prominent. Ratcheting skyrmions follow ordered orbits in which the net displacement parallel to the substrate asymmetry direction is quantized. Skyrmion ratchets represent a new ac current-based method for controlling skyrmion positions and motion for spintronic applications.

  9. Reconstruction of the medial patellofemoral ligament using the adductor magnus tendon: an anatomic study.

    PubMed

    Jacobi, Matthias; Reischl, Nikolaus; Bergmann, Mathias; Bouaicha, Samy; Djonov, Valentin; Magnussen, Robert A

    2012-01-01

    The aims of this study were to evaluate the anatomic feasibility of medial patellofemoral ligament (MPFL) reconstruction using a part of the adductor magnus tendon and to identify possible risks. Twenty cadaveric knees were dissected. The distal part of the adductor magnus tendon was evaluated with respect to the anatomic topography and its utility for MPFL reconstruction. To estimate the risk of injuring the neurovascular structures, the distance from the adductor tubercle to the adductor hiatus was evaluated. An MPFL reconstruction was carried out by preserving the distal insertion on the adductor tubercle and redirecting the proximal portion of the tendon to the medial aspect of the patella. The anatomic investigation showed the following relationships: The mean distance from the adductor tubercle to the adductor hiatus was 99 ± 14 mm (range, 80 to 120 mm). A graft length of 52 ± 5 mm (range, 45 to 63 mm) with the addition of 10 to 20 mm for fixation was found to be necessary for MPFL reconstruction. The difference between the desired graft length and the distance to the adductor hiatus was found to be at least 30 mm in all cases (mean, 46 mm). Leaving the graft attached to the adductor tubercle resulted in a nearly anatomic femoral attachment of the reconstructed MPFL. Complete detachment of the distal adductor magnus attachment was consistently avoidable. The adductor magnus tendon was found to be a useful graft for MPFL reconstruction. However, anatomic dangers (damage to the neurovascular bundle of the adductor hiatus, the saphenous nerve, or the saphenous branch of the descending genicular artery) during graft harvest must be considered. Anatomic knowledge is essential during adductor magnus tendon harvest to avoid damage to neurovascular structures. The adductor magnus tendon is an interesting alternative graft option for MPFL reconstruction if anatomic dangers are considered and avoided. Copyright © 2012 Arthroscopy Association of North America

  10. Computations of the Magnus effect for slender bodies in supersonic flow

    NASA Technical Reports Server (NTRS)

    Sturek, W. B.; Schiff, L. B.

    1980-01-01

    A recently reported Parabolized Navier-Stokes code has been employed to compute the supersonic flow field about spinning cone, ogive-cylinder, and boattailed bodies of revolution at moderate incidence. The computations were performed for flow conditions where extensive measurements for wall pressure, boundary layer velocity profiles and Magnus force had been obtained. Comparisons between the computational results and experiment indicate excellent agreement for angles of attack up to six degrees. The comparisons for Magnus effects show that the code accurately predicts the effects of body shape and Mach number for the selected models for Mach numbers in the range of 2-4.

  11. Physical Analysis of the Drag and Magnus Coefficients of the Topspin Tennis Ball

    NASA Astrophysics Data System (ADS)

    Smith, Elizabeth; Howald, Craig

    2007-05-01

    We experimentally determined the drag and Magnus coefficients of a topspin tennis ball using video analysis. Three video cameras were used to record the initial spin, projectile motion, and final spin of the ball. From these recordings the initial velocity, initial spin, final spin, horizontal acceleration, vertical acceleration, x position, and y positions of the ball were extracted. The coefficient of drag was calculated to be CD=0.6104 +/-0.06187 and the Magnus coefficient was calculated to be CM=0.6576+/-0.08767. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.OSS07.P1.14

  12. Effect of Magnus force on the scale deposition in geothermal systems

    SciTech Connect

    Michaelides, E.E.

    1981-12-01

    The Magnus lift force acts on solid particles present in vertical flows. The action of this force facilitates the mechanism of deposition. In upward flow (production wells), the turbulent fluctuations are necessary for the mechanism of deposition since they bring the particle into the laminar sublayer. In the downward flow, the Magnus force consistently acts toward the wall and turbulent fluctuations are no longer necessary for the mechanism of deposition. If the particle reaches the laminar sublayer, the forces acting on it will keep it near the wall until it is deposited. 10 refs.

  13. Anisotropic Magnus Force in Type-II Superconductors with Planar Defects

    NASA Astrophysics Data System (ADS)

    Monroy, Ricardo Vega; Gomez, Eliceo Cortés

    2015-02-01

    The effect of planar defects on the Magnus force in type-II superconductors is studied. It is shown that the deformation of the vortex due to the presence of a planar defect leads to a local decrease in the mean free path of electrons in the vortex. This effect reduces the effective Magnus coefficient in normal direction to the planar defect, leading to an anisotropic regime of the Hall effect. The presented developments here can qualitatively explain experimental observations of the anisotropic Hall effect in high- T c superconductors in the mixed state.

  14. Computations of the Magnus effect for slender bodies in supersonic flow

    NASA Technical Reports Server (NTRS)

    Sturek, W. B.; Schiff, L. B.

    1980-01-01

    A recently reported Parabolized Navier-Stokes code has been employed to compute the supersonic flow field about spinning cone, ogive-cylinder, and boattailed bodies of revolution at moderate incidence. The computations were performed for flow conditions where extensive measurements for wall pressure, boundary layer velocity profiles and Magnus force had been obtained. Comparisons between the computational results and experiment indicate excellent agreement for angles of attack up to six degrees. The comparisons for Magnus effects show that the code accurately predicts the effects of body shape and Mach number for the selected models for Mach numbers in the range of 2-4.

  15. Systematic Magnus-Based Approach for Suppressing Leakage and Nonadiabatic Errors in Quantum Dynamics

    NASA Astrophysics Data System (ADS)

    Ribeiro, Hugo; Baksic, Alexandre; Clerk, Aashish A.

    2017-01-01

    We present a systematic, perturbative method for correcting quantum gates to suppress errors that take the target system out of a chosen subspace. Our method addresses the generic problem of nonadiabatic errors in adiabatic evolution and state preparation, as well as general leakage errors due to spurious couplings to undesirable states. The method is based on the Magnus expansion: By correcting control pulses, we modify the Magnus expansion of an initially given, imperfect unitary in such a way that the desired evolution is obtained. Applications to adiabatic quantum state transfer, superconducting qubits, and generalized Landau-Zener problems are discussed.

  16. Magnus on Cycle Ergometer with Vibration Isolation System (CEVIS) in US Laboratory Destiny

    NASA Image and Video Library

    2009-03-22

    ISS018-E-042649 (22 March 2009) --- Astronaut Sandra Magnus, STS-119 mission specialist, exercises on the Cycle Ergometer with Vibration Isolation System (CEVIS) in the Destiny laboratory of the International Space Station while Space Shuttle Discovery remains docked with the station.

  17. Comparison among Magnus/Floquet/Fer expansion schemes in solid-state NMR

    SciTech Connect

    Takegoshi, K. Miyazawa, Norihiro; Sharma, Kshama; Madhu, P. K.

    2015-04-07

    We here revisit expansion schemes used in nuclear magnetic resonance (NMR) for the calculation of effective Hamiltonians and propagators, namely, Magnus, Floquet, and Fer expansions. While all the expansion schemes are powerful methods there are subtle differences among them. To understand the differences, we performed explicit calculation for heteronuclear dipolar decoupling, cross-polarization, and rotary-resonance experiments in solid-state NMR. As the propagator from the Fer expansion takes the form of a product of sub-propagators, it enables us to appreciate effects of time-evolution under Hamiltonians with different orders separately. While 0th-order average Hamiltonian is the same for the three expansion schemes with the three cases examined, there is a case that the 2nd-order term for the Magnus/Floquet expansion is different from that obtained with the Fer expansion. The difference arises due to the separation of the 0th-order term in the Fer expansion. The separation enables us to appreciate time-evolution under the 0th-order average Hamiltonian, however, for that purpose, we use a so-called left-running Fer expansion. Comparison between the left-running Fer expansion and the Magnus expansion indicates that the sign of the odd orders in Magnus may better be reversed if one would like to consider its effect in order.

  18. Response to Yiannis Miralis, "Manos Hadjidakis: The Story of an Anarchic Youth and a "Magnus Eroticus"

    ERIC Educational Resources Information Center

    Serghi, Lenia

    2004-01-01

    Manos Hadjidakis and his work are like his song, "O Mythos," for they take you from reality to fantasy and bring you back again. In Magnus Eroticus, the combination of lyrics and music is at the highest level of sensibility and the musical style of each song is superb. Music follows the verse to express its deepest meaning while…

  19. Negative Magnus lift on a rotating sphere at around the critical Reynolds number

    NASA Astrophysics Data System (ADS)

    Muto, Masaya; Tsubokura, Makoto; Oshima, Nobuyuki

    2012-01-01

    Negative Magnus lift acting on a sphere rotating about the axis perpendicular to an incoming flow was investigated using large-eddy simulation at three Reynolds numbers of 1.0 × 104, 2.0 × 105, and 1.14 × 106. The numerical methods used were first validated on a non-rotating sphere, and the spatial resolution around the sphere was determined so as to reproduce the laminar separation, reattachment, and turbulent transition of the boundary layer observed in the vicinity of the critical Reynolds number. The rotating sphere exhibited a positive or negative Magnus effect depending on the Reynolds number and the imposed rotating speed. At Reynolds numbers in the subcritical or supercritical regimes, the direction of the Magnus lift force was independent of the rotational speed. In contrast, the lift force was negative in the critical regime when particular rotating speeds were imposed. This negative Magnus effect was investigated in the context of suppression or promotion of boundary layer transition around the separation point.

  20. Comparison among Magnus/Floquet/Fer expansion schemes in solid-state NMR

    NASA Astrophysics Data System (ADS)

    Takegoshi, K.; Miyazawa, Norihiro; Sharma, Kshama; Madhu, P. K.

    2015-04-01

    We here revisit expansion schemes used in nuclear magnetic resonance (NMR) for the calculation of effective Hamiltonians and propagators, namely, Magnus, Floquet, and Fer expansions. While all the expansion schemes are powerful methods there are subtle differences among them. To understand the differences, we performed explicit calculation for heteronuclear dipolar decoupling, cross-polarization, and rotary-resonance experiments in solid-state NMR. As the propagator from the Fer expansion takes the form of a product of sub-propagators, it enables us to appreciate effects of time-evolution under Hamiltonians with different orders separately. While 0th-order average Hamiltonian is the same for the three expansion schemes with the three cases examined, there is a case that the 2nd-order term for the Magnus/Floquet expansion is different from that obtained with the Fer expansion. The difference arises due to the separation of the 0th-order term in the Fer expansion. The separation enables us to appreciate time-evolution under the 0th-order average Hamiltonian, however, for that purpose, we use a so-called left-running Fer expansion. Comparison between the left-running Fer expansion and the Magnus expansion indicates that the sign of the odd orders in Magnus may better be reversed if one would like to consider its effect in order.

  1. Comparison among Magnus/Floquet/Fer expansion schemes in solid-state NMR.

    PubMed

    Takegoshi, K; Miyazawa, Norihiro; Sharma, Kshama; Madhu, P K

    2015-04-07

    We here revisit expansion schemes used in nuclear magnetic resonance (NMR) for the calculation of effective Hamiltonians and propagators, namely, Magnus, Floquet, and Fer expansions. While all the expansion schemes are powerful methods there are subtle differences among them. To understand the differences, we performed explicit calculation for heteronuclear dipolar decoupling, cross-polarization, and rotary-resonance experiments in solid-state NMR. As the propagator from the Fer expansion takes the form of a product of sub-propagators, it enables us to appreciate effects of time-evolution under Hamiltonians with different orders separately. While 0th-order average Hamiltonian is the same for the three expansion schemes with the three cases examined, there is a case that the 2nd-order term for the Magnus/Floquet expansion is different from that obtained with the Fer expansion. The difference arises due to the separation of the 0th-order term in the Fer expansion. The separation enables us to appreciate time-evolution under the 0th-order average Hamiltonian, however, for that purpose, we use a so-called left-running Fer expansion. Comparison between the left-running Fer expansion and the Magnus expansion indicates that the sign of the odd orders in Magnus may better be reversed if one would like to consider its effect in order.

  2. Analgesia induced by morphine microinjected into the nucleus raphe magnus: effects on tonic pain.

    PubMed

    Dualé, Christian; Sierralta, Fernando; Dallel, Radhouane

    2007-07-01

    One of the possible sites of action of the analgesic effect of morphine is the Nucleus Raphe Magnus, as morphine injected into this structure induces analgesia in transient pain models. In order to test if morphine in the Nucleus Raphe Magnus is also analgesic in a tonic pain model, 5 microg of morphine or saline (control) were microinjected into the Nucleus Raphe Magnus of the rat. Analgesic effects were assessed following nociceptive stimulation using transient heating of the tail (phasic pain) and subcutaneous orofacial injection of 1.5 % formalin (tonic pain). While morphine was strongly analgesic for the tail-flick response (p <0.0001 compared to control), analgesia on the response to formalin was also observed for both early (p = 0.007) and late responses (p = 0.02). However, the response to formalin was not completely blunted. These results suggest that the Nucleus Raphe Magnus is not the exclusive site of action of morphine-induced analgesia in clinical conditions.

  3. Negative Magnus Effect on a Rotating Sphere at around the Critical Reynolds Number

    NASA Astrophysics Data System (ADS)

    Muto, Masaya; Watanabe, Hiroaki; Tsubokura, Makoto; Oshima, Nobuyuki

    2011-12-01

    Negative Magnus lift acting on a sphere rotating about the axis perpendicular to an incoming flow is investigated using large-eddy simulation at three Reynolds numbers of 1.0× 104, 2.0 × 105, and 1.14 × 106. The numerical methods adopted are first validated on a non-rotating sphere and the spatial resolution around the sphere is determined so as to reproduce the laminar separation, reattachment, and turbulent transition of the boundary layer observed at around the critical Reynolds number. In the rotating sphere, positive or negative Magnus effect is observed depending on the Reynolds number and the rotating speed imposed. At the Reynolds number in the subcritical or supercritical region, the direction of the lift force follows the Magnus effect to be independent of the rotational speed tested here. In contrast, negative lift is observed at the Reynolds number at the critical region when particular rotating speeds are imposed. The negative Magnus effect is discussed in the context of the suppression or promotion of boundary layer transition around the separation point.

  4. Response to Yiannis Miralis, "Manos Hadjidakis: The Story of an Anarchic Youth and a "Magnus Eroticus"

    ERIC Educational Resources Information Center

    Serghi, Lenia

    2004-01-01

    Manos Hadjidakis and his work are like his song, "O Mythos," for they take you from reality to fantasy and bring you back again. In Magnus Eroticus, the combination of lyrics and music is at the highest level of sensibility and the musical style of each song is superb. Music follows the verse to express its deepest meaning while…

  5. An anatomic and clinical study of the adductor magnus tendon-descending genicular artery bone flap.

    PubMed

    Huang, Dong; Wang, Hai-Wen; Xu, Da-Chuan; Wang, Hong-Gang; Wu, Wei-Zhi; Zhang, Hui-Ru

    2011-01-01

    The composite tissue flap of the descending genicular vessels with the adductor magnus tendon is a newly developed, reliable method to repair the Achilles tendon and relevant skin defects. The aim of this study was to evaluate the anatomy of the adductor magnus tendon-descending genicular artery bone flap, and the feasibility and value for the repair of the Achilles tendon and relevant skin defects. There were 34 adult specimens used for the anatomy of this flap. The descending genicular artery originates 10.5 ± 1.6 cm above the adductor tubercle, with a diameter of 1.8 ± 0.6 mm and a length of 1.2 ± 0.5 cm. Its articular branch is distributed in the adductor magnus tendon and the medial condyle of the femur. The saphenous branch has a diameter of 1.1 ± 0.3 mm and is distributed in the skin of the upper medial calf. A total of 16 cases of trauma-induced Achilles tendon damage and calcaneus and skin defects were repaired with the vascularized adductor magnus tendon bone flap, including the reconstruction of Achilles tendon insertion and repair of relevant skin defects. All of the composite tissue flaps were viable, the skin sensation of the flaps was recovered, and all patients walked with a normal gait. Our results suggested that the adductor magnus tendon-descending genicular artery bone flap is an alternative method to repair composite tissue defects of the Achilles tendon. Copyright © 2010 Wiley-Liss, Inc.

  6. ISS Expedition 18 Sandra Magnus on the Treadmill Vibration Isolation and Stabilization (TVIS) in Service Module (SM)

    NASA Image and Video Library

    2009-02-12

    ISS018-E-030096 (12 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, equipped with a bungee harness, exercises on the Treadmill Vibration Isolation System (TVIS) in the Zvezda Service Module of the International Space Station.

  7. ISS Expedition 18 Sandra Magnus on the Treadmill Vibration Isolation and Stabilization (TVIS) in Service Module (SM)

    NASA Image and Video Library

    2009-02-12

    ISS018-E-030101 (12 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, equipped with a bungee harness, exercises on the Treadmill Vibration Isolation System (TVIS) in the Zvezda Service Module of the International Space Station.

  8. Simulation of Effects of the Saffman Force and the Magnus Force on Sand Saltation in Turbulent Flow

    SciTech Connect

    Zheng, Zhongquan C.; Zou, Xueyong; Yang, Xiaofan; Cheng, Hong

    2011-12-11

    The effects of both the Saffman force and Magnus force on sand saltation are investigated. Turbulent flows in a channel and over a barchans dune are considered with sand particles injected into the flow. The results show that both of the forces increase the height and skipping distance of sand saltation, with the Magnus force giving more significant effect on the height. These forces can also increase the sand settling at the lee side of the barchans dune.

  9. The tripartite origins of the tonic neck reflex: Gesell, Gerstmann, and Magnus.

    PubMed

    Shevell, Michael

    2009-03-03

    The standard neurologic examination of the newborn and infant includes the elicitation of the tonic neck reflex. Normally present, its persistence is suggestive of neurologic dysfunction and a prognostic marker highly suggestive of an adverse outcome. Working in different fields, with different approaches and largely independently, three leaders of early 20th century neurosciences (Rudolf Magnus, Josef Gerstmann, and Arnold Gesell) elaborated different aspects of this primitive reflex. Magnus provided the first description in an animal model utilizing a meticulously prepared decerebrate cat correctly identifying the reflex's reliance on proprioceptors in the neck and processing in the upper cervical segment. Gerstmann first described its occurrence in the setting of neurologic disease, providing a meticulous written description in an early description of the index case of what would later be eponymously designated Gerstmann-Straussler-Scheinker syndrome. Gesell initially described the reflex's fundamental occurrence in normal young infants, highlighting its adaptive role in early development and its persistence as a hallmark of neurologic pathology.

  10. [Local GABA-ergic modulation of serotonergic neuron activity in the nucleus raphe magnus].

    PubMed

    Iniushkin, A N; Merkulova, N A; Orlova, A O; Iniushkina, E M

    2009-07-01

    In voltage-clamp experimental on slices of the rat brainstem the effects of 5-HT and GABA on serotonergic neurons of nucleus raphe magnus were investigated. Local applications of 5-HT induced an increase in IPCSs frequency and amplitude in 45% of serotonergic cells. The effect suppressed by the blocker of fast sodium channels tetradotoxin. Antagonist of GABA receptor gabazine blocked IPSCs in neurons both sensitive and non-sensitive to 5-HT action. Applications of GABA induced a membrane current (I(GABA)), which was completely blocked by gabazine. The data suggest self-control of the activity of serotonergic neurons in nucleus raphe magnus by negative feedback loop via local GABAergic interneurons.

  11. The Magnus-Rademaker Scientific Film Collection: Ethical Issues on Animal Experimentation (1908-1940).

    PubMed

    Koehler, Peter J; Lameris, Bregt

    2016-01-01

    The Magnus-Rademaker scientific film collection (1908-1940) deals with the physiology of body posture by the equilibrium of reflex musculature contractions for which experimental studies were carried out with animals (e.g., labyrinthectomies, cerebellectomies, and brain stem sections) as well as observations done on patients. The films were made for demonstrations at congresses as well as educational objectives and film stills were published in their books. The purpose of the present study is to position these films and their makers within the contemporary discourse on ethical issues and animal rights in the Netherlands and the earlier international debates. Following an introduction on animal rights and antivivisection movements, we describe what Magnus and Rademaker thought about these issues. Their publications did not provide much information in this respect, probably reflecting their adherence to implicit ethical codes that did not need explicit mentioning in publications. Newspaper articles, however, revealed interesting information. Unnecessary suffering of an animal never found mercy in Magnus' opinion. The use of cinematography was expanded to the reduction of animal experimentation in student education, at least in the case of Rademaker, who in the 1930s was involved in a governmental committee for the regulation of vivisection and cooperated with the antivivisection movement. This resulted not only in a propaganda film for the movement but also in films that demonstrate physiological experiments for students with the purpose to avert repetition and to improve the teaching of experiments. We were able to identify the pertinent films in the Magnus-Rademaker film collection. The production of vivisection films with this purpose appears to have been common, as is shown in news messages in European medical journals of the period.

  12. Infection of total hip prostheses by Peptococcus magnus: an immunofluorescence and ELISA study of two cases.

    PubMed Central

    Taylor, A G; Fincham, W J; Golding, M A; Cook, J

    1979-01-01

    In two cases of infected total hip replacements, Peptococcus magnus was isolated in pure culture from the implant when it was removed. Fluorescent antibody and ELISA studies have shown that both patients developed an antibody response to this anaerobic coccus soon after the replacement operation. These results suggest that the organism is a true infective agent, which was probably responsible for the failure of the arthroplasty operation. PMID:372250

  13. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41538 (9 Aug. 2007) --- Astronauts Stephanie Wilson, STS-120 mission specialist; Sandra Magnus, Expedition 17 flight engineer; and Dan Tani, Expedition 16 flight engineer, use the virtual reality lab at Johnson Space Center to train for their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements. A computer display is visible in the foreground.

  14. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41533 (9 Aug. 2007) --- Astronauts Stephanie Wilson (left), STS-120 mission specialist; Sandra Magnus, Expedition 17 flight engineer; and Dan Tani, Expedition 16 flight engineer, use the virtual reality lab at Johnson Space Center to train for their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  15. The Magnus expansion and the in-medium similarity renormalization group

    NASA Astrophysics Data System (ADS)

    Morris, T. D.; Bogner, S. K.

    2014-10-01

    We present a variant of the in-medium similarity renormalization group(IMSRG) based on the Magnus expansion. In this new variant, the unitary transformation of the IMSRG is constructed explicitly, which allows for the transformation of observables quickly and easily. Additionally, the stiffness of equations encountered by the traditional solution of the IMSRG can be alleviated greatly. We present results and comparisons for the 3d electron gas.

  16. Magnus-induced dynamics of driven skyrmions on a quasi-one-dimensional periodic substrate

    NASA Astrophysics Data System (ADS)

    Reichhardt, C.; Reichhardt, C. J. Olson

    2016-09-01

    We numerically examine driven skyrmions interacting with a periodic quasi-one-dimensional substrate where the driving force is applied either parallel or perpendicular to the substrate periodicity direction. For perpendicular driving, the particles in a purely overdamped system simply slide along the substrate minima; however, for skyrmions where the Magnus force is relevant, we find that a rich variety of dynamics can arise. In the single skyrmion limit, the skyrmion motion is locked along the driving or longitudinal direction for low drives, while at higher drives a transition occurs to a state in which the skyrmion moves both transverse and longitudinal to the driving direction. Within the longitudinally locked phase we find a pronounced speedup effect that occurs when the Magnus force aligns with the external driving force, while at the transition to transverse and longitudinal motion, the skyrmion velocity drops, producing negative differential conductivity. For collectively interacting skyrmion assemblies, the speedup effect is still present and we observe a number of distinct dynamical phases, including a sliding smectic phase, a disordered or moving liquid phase, a moving hexatic phase, and a moving crystal phase. The transitions between the dynamic phases produce distinct features in the structure of the skyrmion lattice and in the velocity-force curves. We map these different phases as a function of the ratio of the Magnus term to the dissipative term, the substrate strength, the commensurability ratio, and the magnitude of the driving force.

  17. Chemical composition, larvicidal action, and adult repellency of Thymus magnus against Aedes albopictus.

    PubMed

    Park, Young-Uk; Koo, Hyun-Na; Kim, Gil-Hah

    2012-09-01

    Thymus magnus, an endemic species, is found in the Republic of Korea. The volatile compounds extracted by SPME from T. magnus were investigated for their chemical composition and electrophysiological response against the Asian tiger mosquito, Aedes albopictus. The volatile compounds of T. magnus as determined by gas chromatography mass spectrometry were gamma-terpinene (33.0%), thymol (29.9%), beta-bisabolene (8.9%), p-cymene (8.3%), alpha-terpinene (5.0%), myrcene (4.7%), beta-caryophyllene (4.0%), alpha-thujene (2.7%), camphene (1.3%), carvacrol (1.2%), and alpha-pinene (1.1%). Among these candidates, thymol exhibited complete (100%) repellent activity against female Ae. albopictus, an effect that was confirmed through evaluating the electrophysiological response on the antenna of Ae. albopictus. The effectiveness of a binary 1:2 mixture of thymol and vanillin (0.05:0.1 microl per cm2) was found to be significantly more effective than thymol alone for a period of 120 min. In addition, thymol, alpha-terpinene, and carvacrol showed high larvicidal activity against on the third-stage larvae with LC50 values of 0.9 microl per 100 ml.

  18. Curveballs in protoplanetary discs - the effect of the Magnus force on planet formation

    NASA Astrophysics Data System (ADS)

    Forbes, John C.

    2015-10-01

    Spinning planetesimals in a gaseous protoplanetary disc may experience a hydrodynamical force perpendicular to their relative velocities. We examine the effect this force has on the dynamics of these objects using analytical arguments based on a simple laminar disc model and numerical integrations of the equations of motion for individual grains. We focus in particular on metre-sized boulders traditionally expected to spiral in to the central star in as little as 100 years from 1 au We find that there are plausible scenarios in which this force extends the lifetime of these solids in the disc by a factor of several. More importantly the velocities induced by the Magnus force can prevent the formation of planetesimals via gravitational instability in the inner disc if the size of the dust particles is larger than of the order of 10 cm. We find that the fastest growing linear modes of the streaming instability may still grow despite the diffusive effect of the Magnus force, but it remains to be seen how the Magnus force will alter the non-linear evolution of these instabilities.

  19. The complete mitochondrial genome of the sexual oribatid mite Steganacarus magnus: genome rearrangements and loss of tRNAs.

    PubMed

    Domes, Katja; Maraun, Mark; Scheu, Stefan; Cameron, Stephen L

    2008-11-07

    Complete mitochondrial (mt) genomes and the gene rearrangements therein are increasingly used as molecular markers for investigating phylogenetic relationships, especially for elucidating deep splits. Contributing to the complete mt genomes of arthropods, especially Arachnida, available so far, we provide the first complete mt genome of a sarcoptiform mite species, the sexually reproducing oribatid mite Steganacarus magnus (Acari, Oribatida) which was determined by sequencing of long PCR products. The mt genome of S. magnus lacks 16 tRNAs, only those for leucine, histidine, proline, tryptophan, glutamine and serine are present. Within those tRNAs only tRNA-His and tRNA-Pro have kept their original position, the others are translocated. Furthermore, the mt genome of S. magnus consists of 13,818 bp and it is composed of 13 protein-coding genes and two genes for the ribosomal RNA subunits that are typically found in metazoan mt genomes. The gene order in S. magnus differs from the hypothetical ancestral chelicerate arrangement as conserved in Limulus polyphemus: instead of nad1-rrnL-rrnS-LNR-nad2 (tRNAs excluded) S. magnus is nad2-rrnL-nad1-rrnS-LNR. Phylogenetic analyses of a concatenated amino acid dataset of all mt protein-coding genes of 28 arthropod species suggest a sister-group relationship of sarcoptiform and prostigmatid mites (S. magnus and Leptotrombidium). The mt gene arrangement of S. magnus differs from the hypothetical ground plan of arthropods and from that of other mites further contributing to the variety of mt gene arrangements found in Arachnida. The unexpected lack of tRNAs is enigmatic, probably showing that the loss of mt genes is an ongoing evolutionary process. For solving phylogenetic relationships of oribatid mite lineages and their position within Acari further complete mt genomes are needed.

  20. Magnus expansion paradoxes in the study of equilibrium magnetization and entanglement in multi-pulse spin locking

    NASA Astrophysics Data System (ADS)

    Kuznetsova, E. I.; Fel'dman, E. B.; Feldman, D. E.

    2016-06-01

    Divergence of the Magnus expansion leads to paradoxes in the spin dynamics of solid-state NMR and in quantum informatics. This review presents results on quasi-equilibrium magnetization in a system of dipole-dipole (DD) coupled spins at times T_2\\ll t \\ll T1ρ in multiple-pulse spin locking ( T_2 is the transverse spin relaxation time and T1ρ is the rotating-frame spin-lattice relaxation time). It is shown how contradictions between the results obtained with the Magnus expansion and experimental data can be removed. Systems of two and three DD coupled spins in multi-pulse spin locking are considered, and the entanglement evolution is investigated using both the Magnus expansion and the exact solution. The critical temperature for an entangled state is also found.

  1. Floquet-Magnus expansion for general N-coupled spins systems in magic-angle spinning nuclear magnetic resonance spectra

    NASA Astrophysics Data System (ADS)

    Mananga, Eugene Stephane; Charpentier, Thibault

    2015-04-01

    In this paper we present a theoretical perturbative approach for describing the NMR spectrum of strongly dipolar-coupled spin systems under fast magic-angle spinning. Our treatment is based on two approaches: the Floquet approach and the Floquet-Magnus expansion. The Floquet approach is well known in the NMR community as a perturbative approach to get analytical approximations. Numerical procedures are based on step-by-step numerical integration of the corresponding differential equations. The Floquet-Magnus expansion is a perturbative approach of the Floquet theory. Furthermore, we address the " γ -encoding" effect using the Floquet-Magnus expansion approach. We show that the average over " γ " angle can be performed for any Hamiltonian with γ symmetry.

  2. Neurocinematography in Pre-World War II Netherlands: The Magnus-Rademaker Collection.

    PubMed

    Koehler, Peter J; Lameris, Bregt; Hielscher, Eva

    2016-01-01

    Historical films made by neuroscientists have shown up in several countries during past years. Although originally supposed to have been lost, we recently found a collection of films produced between 1909 and 1940 by Rudolf Magnus (1873-1927), professor of pharmacology (Utrecht) and his student Gysbertus Rademaker (1887-1957), professor of physiology (1928, succeeding Willem Einthoven) and neurology (1945, both in Leiden). Both collections deal with the physiology of body posture by the equilibrium of reflex musculature contractions for which experimental studies were done with animals (labyrinthectomies, cerebellectomies, and brainstem sections) and observations on patients. The films demonstrate the results of these studies. Moreover, there are films with babies showing tonic neck reflexes and moving images capturing adults with cerebellar symptoms following cerebellectomies for tumors and several other conditions. Magnus' studies resulted in his well-known Körperstellung (1924, "Body Posture") and Rademaker's research in his Das Stehen (1931, "Standing"). The films probably had an educative and scientific purpose. Magnus demonstrated his films at congresses, including the Eighth International Congress of Physiologists (Vienna, 1910) and Rademaker screened his moving images at meetings of the Amsterdam Neurologists Society (at several occasions as reflected in the Winkler-Monakow correspondence and the Nederlands Tijdschrift voor Geneeskunde). Next to these purposes, the films were used to analyze movement and a series of images from the films were published in articles and books. The films are important historical sources that provide a portrait of the pre-World War II era in neuroscience, partly answering questions on how physicians dealt with patients and researchers with their laboratory animals. Moreover, the films confirm that cinematography was an important scientific tool in neuroscience research.

  3. On the inverse Magnus effect for flow past a rotating cylinder

    NASA Astrophysics Data System (ADS)

    John, Benzi; Gu, Xiao-Jun; Barber, Robert W.; Emerson, David R.

    2016-11-01

    Flow past a rotating cylinder has been investigated using the direct simulation Monte Carlo method. The study focuses on the occurrence of the inverse Magnus effect under subsonic flow conditions. In particular, the variations in the coefficients of lift and drag have been investigated as a function of the Knudsen and Reynolds numbers. Additionally, a temperature sensitivity study has been carried out to assess the influence of the wall temperature on the computed aerodynamic coefficients. It has been found that both the Reynolds number and the cylinder wall temperature significantly affect the drag as well as the onset of lift inversion in the transition flow regime.

  4. Antifungal activities of essential oils from Thymus quinquecostatus and T. magnus.

    PubMed

    Shin, Seungwon; Kim, Ji-Hyun

    2004-11-01

    The antifungal activities of essential oils from Thymus quinquecostatus and T. magnus, which are species native to Korea, were evaluated against seven common pathogenic fungi. Additionally, the effects of the oils together with ketoconazole were tested by the checkerboard titer test. Both of the two Thymus oils showed significant inhibition of the tested fungi, with minimal inhibitor concentrations (MICs) and minimal fungicidal concentrations (MFCs) in the range of 0.04-0.39 mg/mL and 0.19-0.78 mg/mL, respectively. The two Thymus oils, and thymol as well, exhibited synergism with ketoconazole against Trichophyton rubrum, which showed the highest susceptibility to these oils.

  5. The results of adductor magnus tenodesis in adolescents with recurrent patellar dislocation.

    PubMed

    Malecki, Krzysztof; Fabis, Jaroslaw; Flont, Pawel; Niedzielski, Kryspin Ryszard

    2015-01-01

    Recurrent dislocation of the patella is a common orthopaedic problem which occurs in about 44% of cases after first-time dislocation. In most cases of first-time patellar dislocation, the medial patellofemoral ligament (MPFL) becomes damaged. Between 2010 and 2012, 33 children and adolescents (39 knees) with recurrent patellar dislocation were treated with MPFL reconstruction using the adductor magnus tendon. The aim of our study is to assess the effectiveness of this surgical procedure. The outcomes were evaluated functionally (Lysholm knee scale, the Kujala Anterior Knee Pain Scale, and isokinetic examination) and radiographically (Caton index, sulcus angle, congruence angle, and patellofemoral angle). Four patients demonstrated redislocation with MPFL graft failure, despite the fact that patellar tracking was found to be normal before the injury, and the patients had not reported any symptoms. Statistically significant improvements in Lysholm and Kujala scales, in patellofemoral and congruence angle, were seen (P < 0.001). A statistically significant improvement in the peak torque of the quadriceps muscle and flexor was observed for 60°/sec and 180°/sec angular velocities (P = 0.01). Our results confirm the efficacy of MPFL reconstruction using the adductor magnus tendon in children and adolescents with recurrent patellar dislocation.

  6. Nitric oxide in the nucleus raphe magnus modulates cutaneous blood flow in rats during hypothermia.

    PubMed

    Arami, Masoumeh Kourosh; Zade, Javad Mirnajafi; Komaki, Alireza; Amiri, Mahmood; Mehrpooya, Sara; Jahanshahi, Ali; Jamei, Behnam

    2015-10-01

    Nucleus Raphe Magnus (NRM) that is involved in the regulation of body temperature contains nitric oxide (NO) synthase. Considering the effect of NO on skin blood flow control, in this study, we assessed its thermoregulatory role within the raphe magnus. To this end, tail blood flow of male Wistar rats was measured by laser doppler following the induction of hypothermia. Intra-NRM injection of SNP (exogenous NO donor, 0.1- 0.2 μl, 0.2 nM) increased the blood flow. Similarly, unilateral microinjection of glutamate (0.1- 0.2 μl, 2.3 nM) into the nucleus increased the blood flow. This effect of L-glutamate was reduced by prior intra NRM administration of NO synthase inhibitor N(G)-methyl-L-arginine or N(G)-nitro-L-arginine methyl ester (L-NAME, 0.1 µl, 100 nM). It is concluded that NO modulates the thermoregulatory response of NRM to hypothermia and may interact with excitatory amino acids in central skin blood flow regulation.

  7. Numerical investigation of the effect of sphere dimples on the drag crisis and the Magnus effect

    NASA Astrophysics Data System (ADS)

    Li, Jing; Tsubokura, Makoto; Tsunoda, Masaya

    2015-11-01

    The present study investigates the flow over a golf ball and a smooth sphere around the critical Reynolds numbers under both stationary and self-spinning conditions by conducting Large-eddy simulations (LES) based on high resolution unstructured grids. For the stationary cases, the present calculation results validate the promotion of the drag crisis at a relatively lower Reynolds number due to the golf ball dimples. It also shows that the golf ball dimples have a limited effect on the time-dependent lateral force development in the subcritical regime, whereas the dimples are beneficial in suppressing the lateral force oscillations in the supercritical regimes. With spin parameter Γ = 0.1, the drag coefficients for the spinning smooth sphere increase slightly in all Reynolds number regimes when compared to the stationary cases, whereas for the spinning golf ball, the drag force decreases in the critical regime and increases in the supercritical regime. For both spinning models, the inverse Magnus effect was reproduced in the critical regime, whereas in the supercritical regime the ordinary Magnus force was generated. Relatively weaker lift forces were also observed in the cases of the spinning golf balls when compared to the spinning smooth spheres.

  8. Nitric oxide in the nucleus raphe magnus modulates cutaneous blood flow in rats during hypothermia

    PubMed Central

    Arami, Masoumeh Kourosh; zade, Javad Mirnajafi; Komaki, Alireza; Amiri, Mahmood; Mehrpooya, Sara; Jahanshahi, Ali; Jamei, Behnam

    2015-01-01

    Objective(s): Nucleus Raphe Magnus (NRM) that is involved in the regulation of body temperature contains nitric oxide (NO) synthase. Considering the effect of NO on skin blood flow control, in this study, we assessed its thermoregulatory role within the raphe magnus. Materials and Methods: To this end, tail blood flow of male Wistar rats was measured by laser doppler following the induction of hypothermia. Results: Intra-NRM injection of SNP (exogenous NO donor, 0.1- 0.2 μl, 0.2 nM) increased the blood flow. Similarly, unilateral microinjection of glutamate (0.1- 0.2 μl, 2.3 nM) into the nucleus increased the blood flow. This effect of L-glutamate was reduced by prior intra NRM administration of NO synthase inhibitor NG-methyl-L-arginine or NG-nitro-L-arginine methyl ester (L-NAME, 0.1 µl, 100 nM). Conclusion: It is concluded that NO modulates the thermoregulatory response of NRM to hypothermia and may interact with excitatory amino acids in central skin blood flow regulation. PMID:26730333

  9. The Results of Adductor Magnus Tenodesis in Adolescents with Recurrent Patellar Dislocation

    PubMed Central

    Malecki, Krzysztof; Fabis, Jaroslaw; Flont, Pawel; Niedzielski, Kryspin Ryszard

    2015-01-01

    Recurrent dislocation of the patella is a common orthopaedic problem which occurs in about 44% of cases after first-time dislocation. In most cases of first-time patellar dislocation, the medial patellofemoral ligament (MPFL) becomes damaged. Between 2010 and 2012, 33 children and adolescents (39 knees) with recurrent patellar dislocation were treated with MPFL reconstruction using the adductor magnus tendon. The aim of our study is to assess the effectiveness of this surgical procedure. The outcomes were evaluated functionally (Lysholm knee scale, the Kujala Anterior Knee Pain Scale, and isokinetic examination) and radiographically (Caton index, sulcus angle, congruence angle, and patellofemoral angle). Four patients demonstrated redislocation with MPFL graft failure, despite the fact that patellar tracking was found to be normal before the injury, and the patients had not reported any symptoms. Statistically significant improvements in Lysholm and Kujala scales, in patellofemoral and congruence angle, were seen (P < 0.001). A statistically significant improvement in the peak torque of the quadriceps muscle and flexor was observed for 60°/sec and 180°/sec angular velocities (P = 0.01). Our results confirm the efficacy of MPFL reconstruction using the adductor magnus tendon in children and adolescents with recurrent patellar dislocation. PMID:25785271

  10. Effects of the Magnus and Saffman forces on the saltation trajectories of sand grain

    NASA Astrophysics Data System (ADS)

    Zou, Xue-Yong; Cheng, Hong; Zhang, Chun-Lai; Zhao, Yan-Zhi

    2007-10-01

    Saltating sand grains are the primary component of airborne sand and account for 75% of all sand transport flux. The saltation height and horizontal distance traveled by sand grains are key factors in sand-control engineering. In addition to gravity and aerodynamic drag, the Magnus and Saffman forces also play important roles in saltation. To quantify the magnitudes of these forces in saltation we used high-speed multi-flash photography to observe the movement of saltating sand grains in a wind tunnel; this proved to be an efficient technique for determining the movement and rotational velocities of grains of natural sand with grain sizes ranging from 0.2 to 0.3 mm and shear velocities ( u*) of 0.67, 0.83, and 0.87 m s - 1 . The rotational speed of saltating sand grains varied between 200 and 800 rev s - 1 ; mean clockwise and anticlockwise rotational speeds were nearly identical, and both increased with increasing saltation height. With saltation heights divided into 1 cm intervals, the rotational speeds followed a Lorentzian distribution. Calculations based on a saltation model showed that the maximum increases in saltation height and in horizontal distance due to the Magnus force were 10.2 and 24.9%, respectively. The rate of increase of both parameters increased with increasing lift-off angle. The maximum increases in saltation height and horizontal distance of sand grains caused by the Saffman force were only 4.6% and 3.7%, respectively.

  11. 3-D magnetic field calculations for wiggglers using MAGNUS-3D

    SciTech Connect

    Pissanetzky, S.; Tompkins, P.

    1988-01-01

    The recent but steady trend toward increased magnetic and geometric complexity in the design of wigglers and undulators, of which tapered wigglers, hybrid structures, laced electromagnetic wigglers, magnetic cladding, twisters and magic structures are examples, has caused a need for reliable 3-D computer models and a better understanding of the behavior of magnetic systems in three dimensions. The capabilities of the MAGNUS-3D Group of Programs are ideally suited to solve this class of problems and provide insight into 3-D effects. MAGNUS-3D can solve any problem of Magnetostatics involving permanent magnets, linear or nonlinear ferromagnetic materials and electric conductors of any shape in space. The magnetic properties of permanent magnets are described by the complete nonlinear demagnetization curve as provided by the manufacturer, or, at the user's choice, by a simpler approximation involving the coercive force, the residual induction and the direction of magnetization. The ferromagnetic materials are described by a magnetization table and an accurate interpolation relation. An internal library with properties of common industrial steels is available. The conductors are independent of the mesh and are described in terms of conductor elements from an internal library.

  12. Textual alchemy: the transformation of pseudo-Albertus Magnus's Semita recta into the Mirror of Lights.

    PubMed

    Grund, Peter

    2009-11-01

    This article explores the strategies of and the reasons behind the reworking of pseudo-Albertus Magnus's Semita recta into the Mirror of Lights. I argue that the redactor sought to provide a more comprehensive defence of the legitimacy of alchemy than found in the Semita recta. In the process of doing so, he reshaped the original text so as to present three units that addressed different parts of the alchemical opus: first, theory and justification of alchemy; second, basic information on substances and procedures; and, third, practice. The redactor employed sophisticated textual tools identical to those seen in scholastic texts. These strategies, I argue, constitute part of the redactor's attempt to bring authority and credibility to his project and to alchemy in general. Certainly, much more attention needs to be paid to these experiments of textual alchemy in order to understand the practice of alchemy in the late medieval period.

  13. Observation of Intrinsic Magnus Force and Direct Detection of Chirality in Superfluid 3He-A

    NASA Astrophysics Data System (ADS)

    Ikegami, Hiroki; Tsutsumi, Yasumasa; Kono, Kimitoshi

    2015-04-01

    We report details of the observation of the intrinsic Magnus (IM) force acting on negative and positive ions trapped just below a free surface of the A phase of superfluid 3He (3He-A). From the transport measurements of the ions along the surface, we found that the IM force acts on both the negative and positive ions. We also demonstrate that the transport measurements could distinguish whether the surface is composed of a chiral monodomain or multiple chiral domains. For multiple chiral domains, the current of the ions was found to be irreproducible and unstable, which was reasonably explained by the formation of the chiral domain structure and the dynamics of the chiral domain walls. For chiral monodomains, the appearance ratio of chirality emerging upon cooling through the superfluid transition temperature was found to depend on the direction of the external magnetic field, which implies the existence of an unknown coupling between the chirality and the magnetic field.

  14. Magnus Hirschfeld, his biographies and the possibilities and boundaries of "biography" as "doing history.".

    PubMed

    Brennan, Toni; Hegarty, Peter

    2009-12-01

    This article considers the two major biographies of sexologist Magnus Hirschfeld, MD (1868-1935), an early campaigner for "gay rights" avant la lettre. Like him, his first biographer Charlotte Wolff (1897-1986) was a Jewish doctor who lived and worked in Weimar Republic Berlin and fled Germany when the Nazi regime came to power. When researching Hirschfeld's biography (published in English in 1986) Wolff met a librarian and gay activist, Manfred Herzer, who would eventually be a cofounder of the Gay Museum in Berlin and publish (in German, in 1992) the other major Hirschfeld biography currently available. Using, inter alia, the correspondence between Wolff and Herzer, the article aims to explore and interrogate the boundaries and possibilities of "biography" as a form of "doing history."

  15. STS-112 M.S. Magnus in white room before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. - -- In the White Room at Launch Pad 39B, STS-112 Mission Specialist Sandra H. Magnus, Ph.D., receives assistance with her spacesuit before boarding Space Shuttle Atlantis. Liftoff is schedued for 3:46 p.m. EDT. Along with a crew of six, Atlantis will carry the S1 Integrated Truss Structure and the Crew and Equipment Translation Aid (CETA) Cart A to the International Space Station (ISS). The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss.

  16. American Catholicism's science crisis and the Albertus Magnus Guild, 1953-1969.

    PubMed

    Binzley, Ronald A

    2007-12-01

    During the middle decades of the twentieth century, American Catholic scientists experienced a sense of crisis owing to the paucity of scientific research performed either by individual Catholics or in Catholic institutions of higher learning. In 1953 the Rev. Patrick Yancey, S.J., the chairman of the biology department at a small Jesuit college and a member of the newly created National Science Board, led efforts to establish a national organization of Catholic scientists. Subsequently known as the Albertus Magnus Guild, this organization attempted both to improve Catholics' scientific performance and to refute the widely held notion among non-Catholic Americans that Catholicism was inherently hostile to science. By reflecting on Yancey's career as an educator and scientist and on the history of the guild, this article seeks to deepen our understanding of twentieth-century Catholic science education and reveal the ways in which Catholic scientists approached the issues surrounding the interaction of science and religion.

  17. STS-112 M.S. Magnus in white room before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. - -- In the White Room at Launch Pad 39B, STS-112 Mission Specialist Sandra H. Magnus, Ph.D., receives assistance with her spacesuit before boarding Space Shuttle Atlantis. Liftoff is schedued for 3:46 p.m. EDT. Along with a crew of six, Atlantis will carry the S1 Integrated Truss Structure and the Crew and Equipment Translation Aid (CETA) Cart A to the International Space Station (ISS). The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss.

  18. Effect of arginine vasopressin in the nucleus raphe magnus on antinociception in the rat.

    PubMed

    Yang, Jun; Chen, Jian-Min; Liu, Wen-Yan; Song, Cao-You; Wang, Cheng-Hai; Lin, Bao-Cheng

    2006-09-01

    Previous work has shown that arginine vasopressin (AVP) regulates antinociception through brain nuclei rather than the spinal cord and peripheral organs. The present study investigated the nociceptive effect of AVP in the nucleus raphe magnus (NRM) of the rat. Microinjection of AVP into the NRM increased pain threshold in a dose-dependent manner, while local administration of AVP-receptor antagonist-d(CH2)5Tyr(Et)DAVP decreased the pain threshold. Pain stimulation elevated AVP concentration in the NRM perfuse liquid. NRM pretreatment with AVP-receptor antagonist completely reversed AVP's effect on pain threshold in the NRM. The data suggest that AVP in the NRM is involved in antinociception.

  19. The adductor part of the adductor magnus is innervated by both obturator and sciatic nerves.

    PubMed

    Takizawa, Megumi; Suzuki, Daisuke; Ito, Hajime; Fujimiya, Mineko; Uchiyama, Eiichi

    2014-07-01

    The hip adductor group, innervated predominantly by the obturator nerve, occupies a large volume of the lower limb. However, case reports of patients with obturator nerve palsy or denervation have described no more than minimal gait disturbance. Those facts are surprising, given the architectural characteristics of the hip adductors. Our aim was to investigate which regions of the adductor magnus are innervated by the obturator nerve and by which sciatic nerve and to consider the clinical implications. Twenty-one lower limbs were examined from 21 formalin-fixed cadavers, 18 males and 3 females. The adductor magnus was dissected and was divided into four parts (AM1-AM4) based on the locations of the perforating arteries and the adductor hiatus. AM1 was supplied solely by the obturator nerve. AM2, AM3, and AM4 received innervation from both the posterior branch of the obturator nerve and the tibial nerve portion of the sciatic nerve in 2 (9.5%), 20 (95.2%), and 6 (28.6%) of the cadavers, respectively. The double innervation in more than 90% of the AM3s is especially noteworthy. Generally, AM1-AM3 corresponds to the adductor part, traditionally characterized as innervated by the obturator nerve, and AM4 corresponds to the hamstrings part, innervated by the sciatic nerve. Here, we showed that the sciatic nerve supplies not only the hamstrings part but also the adductor part. These two nerves spread more widely than has generally been believed, which could have practical implications for the assessment and treatment of motor disability. Copyright © 2013 Wiley Periodicals, Inc.

  20. Metamaterials with tunable negative refractive index fabricated from nanoamorphous ferromagnetic microwires and Magnus optical effect

    NASA Astrophysics Data System (ADS)

    Ivanov, A.; Shalygin, A.; Galkin, V.; Vedyayev, A.; Rozanov, K.; Ivanov, V.

    2008-08-01

    For inhomogeneous mediums the optical Magnus effect has been derived. The metamaterials fabricated from amorphous ferromagnet Co-Fe-Cr-B-Si microwires are shown to exhibit a negative refractive index for electromagnetic waves over wide scale of GHz frequencies. Optical properties and optical Magnus effect of such metamaterials are tunable by an external magnetic field. Microwave permeability of glass-coated ferromagnetic amorphous microwire exhibiting a weak negative magnetostriction has been studied. The diameter of the microwire was about 20 μm and the diameter of the metal core was about 12 μm. The microwire was wound to comprise a 7/3 washer-shaped composite sample with the volume fraction of magnetic constituent of about 10%. The permeability of the composite sample was measured in a coaxial line in the frequency range from 0.1 to 10 GHz. The composite was found to exhibit a negative permeability within the frequency range from approximately 0.7 to 1.5 GHz, with the permeability being as low as -0.4. Therefore, microwire-based composites, particularly, crossed arrays of microwires may be employed to develop metamaterials for microwave applications. In the composite, the negative microwave permeability is due to the natural ferromagnetic resonance and the negative microwave permittivity is due to the inherent inductance of the wire. Such metamaterials are advantageous in simple design, isotropic in-plane performance, and possible tunability of performance by external magnetic bias. However, for a feasible metamaterial fabricated from microwire arrays, the wires have to exhibit higher magnitude of the ferromagnetic resonance, higher quality factor, and higher resonance frequency.

  1. Floquet–Magnus theory and generic transient dynamics in periodically driven many-body quantum systems

    SciTech Connect

    Kuwahara, Tomotaka; Mori, Takashi; Saito, Keiji

    2016-04-15

    This work explores a fundamental dynamical structure for a wide range of many-body quantum systems under periodic driving. Generically, in the thermodynamic limit, such systems are known to heat up to infinite temperature states in the long-time limit irrespective of dynamical details, which kills all the specific properties of the system. In the present study, instead of considering infinitely long-time scale, we aim to provide a general framework to understand the long but finite time behavior, namely the transient dynamics. In our analysis, we focus on the Floquet–Magnus (FM) expansion that gives a formal expression of the effective Hamiltonian on the system. Although in general the full series expansion is not convergent in the thermodynamics limit, we give a clear relationship between the FM expansion and the transient dynamics. More precisely, we rigorously show that a truncated version of the FM expansion accurately describes the exact dynamics for a certain time-scale. Our theory reveals an experimental time-scale for which non-trivial dynamical phenomena can be reliably observed. We discuss several dynamical phenomena, such as the effect of small integrability breaking, efficient numerical simulation of periodically driven systems, dynamical localization and thermalization. Especially on thermalization, we discuss a generic scenario on the prethermalization phenomenon in periodically driven systems. -- Highlights: •A general framework to describe transient dynamics for periodically driven systems. •The theory is applicable to generic quantum many-body systems including long-range interacting systems. •Physical meaning of the truncation of the Floquet–Magnus expansion is rigorously established. •New mechanism of the prethermalization is proposed. •Revealing an experimental time-scale for which non-trivial dynamical phenomena can be reliably observed.

  2. Investigation of the effect of finite pulse errors on the BABA pulse sequence using the Floquet-Magnus expansion approach

    NASA Astrophysics Data System (ADS)

    Mananga, Eugene S.; Reid, Alicia E.

    2013-01-01

    This paper presents a study of finite pulse widths for the BABA pulse sequence using the Floquet-Magnus expansion (FME) approach. In the FME scheme, the first order ? is identical to its counterparts in average Hamiltonian theory (AHT) and Floquet theory (FT). However, the timing part in the FME approach is introduced via the ? function not present in other schemes. This function provides an easy way for evaluating the spin evolution during the time in between' through the Magnus expansion of the operator connected to the timing part of the evolution. The evaluation of ? is particularly useful for the analysis of the non-stroboscopic evolution. Here, the importance of the boundary conditions, which provide a natural choice of ? , is ignored. This work uses the ? function to compare the efficiency of the BABA pulse sequence with ? and the BABA pulse sequence with finite pulses. Calculations of ? and ? are presented.

  3. Floquet resonant states and validity of the Floquet-Magnus expansion in the periodically driven Friedrichs models

    NASA Astrophysics Data System (ADS)

    Mori, Takashi

    2015-02-01

    The Floquet eigenvalue problem is analyzed for periodically driven Friedrichs models on discrete and continuous space. In the high-frequency regime, there exists a Floquet bound state consistent with the Floquet-Magnus expansion in the discrete Friedrichs model, while it is not the case in the continuous model. In the latter case, however, the bound state predicted by the Floquet-Magnus expansion appears as a metastable state whose lifetime diverges in the limit of large frequencies. We obtain the lifetime by evaluating the imaginary part of the quasienergy of the Floquet resonant state. In the low-frequency regime, there is no Floquet bound state and instead the Floquet resonant state with exponentially small imaginary part of the quasienergy appears, which is understood as the quantum tunneling in the energy space.

  4. A mini-invasive adductor magnus tendon transfer technique for medial patellofemoral ligament reconstruction: a technical note.

    PubMed

    Sillanpää, Petri J; Mäenpää, Heikki M; Mattila, Ville M; Visuri, Tuomo; Pihlajamäki, Harri

    2009-05-01

    Patellar dislocations are associated with injuries to the medial patellofemoral ligament (MPFL). Several techniques for MPFL reconstruction have been recently published with some disadvantages involved, including large skin incisions and donor site morbidity. Arthroscopic stabilizing techniques carry the potential of inadequate restoration of MPFL function. We present a minimally invasive technique for MPFL reconstruction using adductor magnus tendon autograft. This technique is easily performed, safe, and provides a stabilizing effect equal to current MPFL reconstructions. Skin incision of only 3-4 cm is located at the level of the proximal half of the patella. After identifying the distal insertion of the adductor magnus tendon, a tendon harvester is introduced to harvest the medial two-thirds of the tendon, while the distal insertion is left intact. The adductor magnus tendon is cut at 12-14 cm from its distal insertion and transferred into the patellar medial margin. Two suture anchors are inserted through the same incision at the superomedial aspect of the patella in the anatomic MPFL origin. The graft is tightened at 30 degrees knee flexion. Aftercare includes 4 weeks of brace treatment with restricted range of motion.

  5. Black holes and fundamental fields: Hair, kicks, and a gravitational Magnus effect

    NASA Astrophysics Data System (ADS)

    Okawa, Hirotada; Cardoso, Vitor

    2014-11-01

    Scalar fields pervade theoretical physics and are a fundamental ingredient to solve the dark matter problem, to realize the Peccei-Quinn mechanism in QCD or the string-axiverse scenario. They are also a useful proxy for more complex matter interactions, such as accretion disks or matter in extreme conditions. Here, we study the collision between scalar "clouds" and rotating black holes. For the first time we are able to compare analytic estimates and strong field, nonlinear numerical calculations for this problem. As the black hole pierces through the cloud it accretes according to the Bondi-Hoyle prediction, but is deflected through a purely kinematic gravitational "anti-Magnus" effect, which we predict to be present also during the interaction of black holes with accretion disks. After the interaction is over, we find large recoil velocities in the transverse direction. The end-state of the process belongs to the vacuum Kerr family if the scalar is massless, but can be a hairy black hole when the scalar is massive.

  6. Opioid microinjection into raphe magnus modulates cardiorespiratory function in mice and rats

    PubMed Central

    Hellman, Kevin M.; Mendelson, Scott J.; Mendez-Duarte, Marco A.; Russell, James L.

    2009-01-01

    The raphe magnus (RM) participates in opioid analgesia and contains pain-modulatory neurons with respiration-related discharge. Here, we asked whether RM contributes to respiratory depression, the most prevalent lethal effect of opioids. To investigate whether opioidergic transmission in RM produces respiratory depression, we microinjected a mu-opioid receptor agonist, DAMGO, or morphine into the RM of awake rodents. In mice, opioid microinjection produced sustained decreases in respiratory rate (170 to 120 breaths/min), as well as heart rate (520 to 400 beats/min). Respiratory sinus arrhythmia, indicative of enhanced parasympathetic activity, was prevalent in mice receiving DAMGO microinjection. We performed similar experiments in rats but observed no changes in breathing rate or heart rate. Both rats and mice experienced significantly more episodes of bradypnea, indicative of impaired respiratory drive, after opioid microinjection. During spontaneous arousals, rats showed less tachycardia after opioid microinjection than before microinjection, suggestive of an attenuated sympathetic tone. Thus, activation of opioidergic signaling within RM produces effects beyond analgesia, including the unwanted destabilization of cardiorespiratory function. These adverse effects on homeostasis consequent to opioid microinjection imply a role for RM in regulating the balance of sympathetic and parasympathetic tone. PMID:19710394

  7. The sexologist Albert Moll--between Sigmund Freud and Magnus Hirschfeld.

    PubMed

    Sigusch, Volkmar

    2012-04-01

    Albert Moll was one of the most influential sexologists during the first three decades of the twentieth century. In contrast to his rivals Sigmund Freud and Magnus Hirschfeld, his achievements have not yet been recognised adequately. The author gives a comparative account of the work of these three protagonists. This shows that Moll formed some ideas which are regarded as psychoanalytical today before Freud, and that he, in contrast to Hirschfeld, was able to reflect critically on contemporary discourses, such as the debates on racial improvement through eugenics. As scientific theories, Freud's psychoanalysis represented the unconscious, fantasy, experience and latency, while Moll's sexology represented consciousness, ontological reality, behaviour and manifestation. Moll's major disagreement with Hirschfeld's sexology was his advocacy of apolitical and impartial science, whereas Hirschfeld's aim was to achieve sexual reforms politically. Added to these differences were strong personal animosities. Freud called Moll a 'beast' and 'pettifogger'; and Moll complained about Hirschfeld's 'problematic' character. When Hirschfeld escaped the Nazi terror and went to Paris, Moll denounced him in order to prevent him rebuilding a new existence in exile.

  8. An analysis of texture, timbre, and rhythm in relation to form in Magnus Lindberg's "Gran Duo"

    NASA Astrophysics Data System (ADS)

    Wolfe, Brian Thomas

    Gran Duo (1999-2000) by Magnus Lindberg (b. 1958) is the result of a commission by Sir Simon Rattle, former conductor of the City of Birmingham (England) Symphony Orchestra, and the Royal Festival Hall to commemorate the third millennium. Composed for twenty-four woodwinds and brass, Lindberg divides the woodwind and brass families into eight characters that serve as participants in an attentive twenty-minute conversation. The document includes biographical information about the composition to further understand Lindberg's writing style. The composer's use of computer-assisted composition techniques inspires an alternative structural analysis of Gran Duo. Spectral graphs provide a supplementary tool for score study assisting with the verification of formal structural elements. A tempo chart allows the conductor to easily identify form and tempo relationships between each of the nineteen sections throughout the five-movement composition. In order to reveal character areas and their relation to the structure of the work, the analysis of texture, timbre, and rhythm reveal the formal structure of the composition, which reflects a conversation between the brass and woodwinds in this setting for wind instruments.

  9. Metamaterials with tunable refractive index fabricated from amorphous ferromagnetic microwires and optical Magnus effect

    NASA Astrophysics Data System (ADS)

    Ivanov, Andrey; Vedyayev, Anatoly; Galkin, Vladimir; Shalygin, Alexander; Ivanov, Valery

    2009-03-01

    For homogeneous NPVM (negative phase--velocity mediums) [V. G. Veselago, Soviet Physics - Uspekhi 10 (1968) 509; T. G. Mackay, A. Lakhtakia, Phys. Rev. E 69 (2004) 026602] anomalous effects such as negative refraction, light pressure, Doppler shift, Cherenkov-Vavilov radiation, Goos-Hanchen effect have been discovered in different frequency ranges. In this presentation the optical circular polarized effect is calculated for inhomogeneous mediums (optical Magnus effect) and it is shown that it is anomalous in NPVM with respect to ``right-handed'' materials. The proposed metamaterials fabricated from glass coated amorphous ferromagnetic Co-Fe-Cr-B-Si microwires are shown to exhibit a negative refractive index for electromagnetic waves over scale of GHz frequencies [A.V. Ivanov, A.N. Shalygin, A.V. Vedyayev, V.A. Ivanov, JETP Letters 85 (2007) 565]. The magnetostatic interaction between microwires has been taken into account. The phase and group velocities in proposed metamaterial have been calculated. The ratio of thereof depends monotonically on the size of the microwires. Optical properties of such metamaterials are tunable by an external magnetic field and mechanical stress.

  10. Vision and cognition in the natural philosophy of Albert the Great (Albertus Magnus).

    PubMed

    Theiss, P; Grüsser, O J

    1994-01-01

    Albert the Great (Albertus Magnus, ca. 1197-1280) descended from a nobleman's family in Upper Suebia and studied natural philosophy and theology at the University of Padova, where he joined the Dominican order. Confronted with Aristotelian thought mainly in its Arabic modification (Avicenna, Al-Farabi, Averroes, Alhazen, Costa ben Luca and others) from his days in Padova, he elaborated in several books on the principles of natural philosophy, biology, brain and sense functions and psychology in addition to his theological and exegetic works. His observations and concepts on vision are discussed in detail. It is pointed out that Albert discovered some phenomena of vision not before known such as vestibular nystagmus and rod monochromacy, i.e. total colour blindness accompanied by photophobia. Based on clinical observations Albert also postulated a decussation of the optic nerve fibres at the optic chiasm. Albert's concept of higher order cognitive function is discussed and some of his explanations of dreams and neuropsychiatric disease on the basis of his cognitive model are mentioned. Albert's thoughts on vision and other sense perceptions, higher brain functions and cognition are considered as progressive elaborations of Galenic concepts as adapted by some Patristic theologians and the Arabic natural scientists and philosophers of the 9th-11th century.

  11. The Sexologist Albert Moll – between Sigmund Freud and Magnus Hirschfeld

    PubMed Central

    Sigusch, Volkmar

    2012-01-01

    Albert Moll was one of the most influential sexologists during the first three decades of the twentieth century. In contrast to his rivals Sigmund Freud and Magnus Hirschfeld, his achievements have not yet been recognised adequately. The author gives a comparative account of the work of these three protagonists. This shows that Moll formed some ideas which are regarded as psychoanalytical today before Freud, and that he, in contrast to Hirschfeld, was able to reflect critically on contemporary discourses, such as the debates on racial improvement through eugenics. As scientific theories, Freud’s psychoanalysis represented the unconscious, fantasy, experience and latency, while Moll’s sexology represented consciousness, ontological reality, behaviour and manifestation. Moll’s major disagreement with Hirschfeld’s sexology was his advocacy of apolitical and impartial science, whereas Hirschfeld’s aim was to achieve sexual reforms politically. Added to these differences were strong personal animosities. Freud called Moll a ‘beast’ and ‘pettifogger’; and Moll complained about Hirschfeld’s ‘problematic’ character. When Hirschfeld escaped the Nazi terror and went to Paris, Moll denounced him in order to prevent him rebuilding a new existence in exile. PMID:23002292

  12. Introduction of the Floquet-Magnus expansion in solid-state nuclear magnetic resonance spectroscopy.

    PubMed

    Mananga, Eugène S; Charpentier, Thibault

    2011-07-28

    In this article, we present an alternative expansion scheme called Floquet-Magnus expansion (FME) used to solve a time-dependent linear differential equation which is a central problem in quantum physics in general and solid-state nuclear magnetic resonance (NMR) in particular. The commonly used methods to treat theoretical problems in solid-state NMR are the average Hamiltonian theory (AHT) and the Floquet theory (FT), which have been successful for designing sophisticated pulse sequences and understanding of different experiments. To the best of our knowledge, this is the first report of the FME scheme in the context of solid state NMR and we compare this approach with other series expansions. We present a modified FME scheme highlighting the importance of the (time-periodic) boundary conditions. This modified scheme greatly simplifies the calculation of higher order terms and shown to be equivalent to the Floquet theory (single or multimode time-dependence) but allows one to derive the effective Hamiltonian in the Hilbert space. Basic applications of the FME scheme are described and compared to previous treatments based on AHT, FT, and static perturbation theory. We discuss also the convergence aspects of the three schemes (AHT, FT, and FME) and present the relevant references.

  13. Interaction of the topological phase and the Magnus effect in a multimode fiber

    NASA Astrophysics Data System (ADS)

    Aleksiev, A.; Modnikova, E.; Fadeyeva, Tatyana A.; Lapayeva, S. N.; Volyar, Alexander V.

    1996-04-01

    The phenomenon of a light topological birefringence in a multimode fiber has been discussed in papers. The physical mechanism of the topological birefringence, as expected earlier is determined by the interaction of the two effects, namely, the topological Berry's phase and the optical Magnus effect. So, for a square distribution of a refractive index in a fiber cross section the near-meridianal local waves propagate along ray trajectories represented by strongly stretched ellipses of an elliptical helix. A plane made by a fiber axis and a major axis of a ray elliptical helix undergoes a rotation into the fiber, and the rotation hand of this plane is defined by a sign of the wave polarization circularity. If a linear polarized light drops into a fiber input its left-hand polarized component will rotate the major axis of the elliptical helix counterclockwise, and the right-hand polarized component rotates clockwise. Since the angular rates of this rotation are slightly different one from another forthcoming the local waves having counter circulation of a polarization should be collapsed in a single linear polarized local wave. However if the local wave trajectory doesn't lie in a plane then it is a space curve.

  14. Magnus Expansion Approach to Parametric Oscillator Systems in a Thermal Bath

    NASA Astrophysics Data System (ADS)

    Zhu, Beilei; Rexin, Tobias; Mathey, Ludwig

    2016-10-01

    We develop a Magnus formalism for periodically driven systems which provides an expansion both in the driving term and in the inverse driving frequency, applicable to isolated and dissipative systems. We derive explicit formulas for a driving term with a cosine dependence on time, up to fourth order. We apply these to the steady state of a classical parametric oscillator coupled to a thermal bath, which we solve numerically for comparison. Beyond dynamical stabilisation at second order, we find that the higher orders further renormalise the oscillator frequency, and additionally create a weakly renormalised effective temperature. The renormalised oscillator frequency is quantitatively accurate almost up to the parametric instability, as we confirm numerically. Additionally, a cut-off dependent term is generated, which indicates the break down of the hierarchy of time scales of the system, as a precursor to the instability. Finally, we apply this formalism to a parametrically driven chain, as an example for the control of the dispersion of a many-body system.

  15. Opioid microinjection into raphe magnus modulates cardiorespiratory function in mice and rats.

    PubMed

    Hellman, Kevin M; Mendelson, Scott J; Mendez-Duarte, Marco A; Russell, James L; Mason, Peggy

    2009-11-01

    The raphe magnus (RM) participates in opioid analgesia and contains pain-modulatory neurons with respiration-related discharge. Here, we asked whether RM contributes to respiratory depression, the most prevalent lethal effect of opioids. To investigate whether opioidergic transmission in RM produces respiratory depression, we microinjected a mu-opioid receptor agonist, DAMGO, or morphine into the RM of awake rodents. In mice, opioid microinjection produced sustained decreases in respiratory rate (170 to 120 breaths/min), as well as heart rate (520 to 400 beats/min). Respiratory sinus arrhythmia, indicative of enhanced parasympathetic activity, was prevalent in mice receiving DAMGO microinjection. We performed similar experiments in rats but observed no changes in breathing rate or heart rate. Both rats and mice experienced significantly more episodes of bradypnea, indicative of impaired respiratory drive, after opioid microinjection. During spontaneous arousals, rats showed less tachycardia after opioid microinjection than before microinjection, suggestive of an attenuated sympathetic tone. Thus, activation of opioidergic signaling within RM produces effects beyond analgesia, including the unwanted destabilization of cardiorespiratory function. These adverse effects on homeostasis consequent to opioid microinjection imply a role for RM in regulating the balance of sympathetic and parasympathetic tone.

  16. Floquet-Magnus theory and generic transient dynamics in periodically driven many-body quantum systems

    NASA Astrophysics Data System (ADS)

    Kuwahara, Tomotaka; Mori, Takashi; Saito, Keiji

    2016-04-01

    This work explores a fundamental dynamical structure for a wide range of many-body quantum systems under periodic driving. Generically, in the thermodynamic limit, such systems are known to heat up to infinite temperature states in the long-time limit irrespective of dynamical details, which kills all the specific properties of the system. In the present study, instead of considering infinitely long-time scale, we aim to provide a general framework to understand the long but finite time behavior, namely the transient dynamics. In our analysis, we focus on the Floquet-Magnus (FM) expansion that gives a formal expression of the effective Hamiltonian on the system. Although in general the full series expansion is not convergent in the thermodynamics limit, we give a clear relationship between the FM expansion and the transient dynamics. More precisely, we rigorously show that a truncated version of the FM expansion accurately describes the exact dynamics for a certain time-scale. Our theory reveals an experimental time-scale for which non-trivial dynamical phenomena can be reliably observed. We discuss several dynamical phenomena, such as the effect of small integrability breaking, efficient numerical simulation of periodically driven systems, dynamical localization and thermalization. Especially on thermalization, we discuss a generic scenario on the prethermalization phenomenon in periodically driven systems.

  17. Increased glutamate synaptic transmission in the nucleus raphe magnus neurons from morphine-tolerant rats

    PubMed Central

    Bie, Bihua; Pan, Zhizhong Z

    2005-01-01

    Currently, opioid-based drugs are the most effective pain relievers that are widely used in the treatment of pain. However, the analgesic efficacy of opioids is significantly limited by the development of tolerance after repeated opioid administration. Glutamate receptors have been reported to critically participate in the development and maintenance of opioid tolerance, but the underlying mechanisms remain unclear. Using whole-cell voltage-clamp recordings in brainstem slices, the present study investigated chronic morphine-induced adaptations in glutamatergic synaptic transmission in neurons of the nucleus raphe magnus (NRM), a key supraspinal relay for pain modulation and opioid analgesia. Chronic morphine significantly increased glutamate synaptic transmission exclusively in one class of NRM cells that contains μ-opioid receptors in a morphine-tolerant state. The adenylyl cyclase activator forskolin and the cAMP analog 8-bromo-cAMP mimicked the chronic morphine effect in control neurons and their potency in enhancing the glutamate synaptic current was significantly increased in neurons from morphine-tolerant rats. MDL12330a, an adenylyl cyclase inhibitor, and H89, a protein kinase A (PKA) inhibitor, reversed the increase in glutamate synaptic transmission induced by chronic morphine. In addition, PMA, a phorbol ester activator of protein kinase C (PKC), also showed an increased potency in enhancing the glutamate synaptic current in these morphine-tolerant cells. The PKC inhibitor GF109203X attenuated the chronic morphine effect. Taken together, these results suggest that chronic morphine increases presynaptic glutamate release in μ receptor-containing NRM neurons in a morphine-tolerant state, and that the increased glutamate synaptic transmission appears to involve an upregulation of both the cAMP/PKA pathway and the PKC pathway. This glutamate-mediated activation of these NRM neurons that are thought to facilitate spinal pain transmission may contribute to

  18. The adductor magnus "mini-hamstring": MRI appearance and potential pitfalls.

    PubMed

    Broski, Stephen M; Murthy, Naveen S; Krych, Aaron J; Obey, Mitchel R; Collins, Mark S

    2016-02-01

    To examine the anatomic MRI characteristics of the adductor magnus mini hamstring (AMMH) and explore its involvement in cases of hamstring avulsion. An IRB-approved retrospective review of patients undergoing "hamstring protocol" MRI between March 2009 and June 2014 was performed. Two musculoskeletal radiologists recorded multiple AMMH anatomic characteristics and involvement in cases of hamstring avulsion. Seventy-six AMMHs were analyzed in 66 patients [35 females and 31 males, mean age 49.3 ± 15.2 years (range 17-81)]. Eleven percent of AMMHs were poorly visualized, 51 % visualized, and 37 % well visualized. Seven percent demonstrated round, 73 % ovoid, and 21 % flat/lenticular tendon morphologies. Most (88 %) demonstrated typical origins. Average cross-sectional area (CSA) was 22.4 ± 10.6 mm² (range 6-56), diameter was 7.2 ± 2.5 mm (range 2.9-15), medial distance from the semimembranosus tendon was 7.5 ± 2.5 mm (range 3-14), and tendon length was 6.8 ± 3.3 cm (range 1.2-14.1). There was no gender difference in AMMH anatomic measurements or correlation between age and CSA or diameter. Of 17 complete hamstring avulsion cases, the AMMH was intact in 13, partially torn in 3, and completely torn in 1. The AMMH is a constant finding with variable anatomic characteristics. It is visualized or well visualized by MRI in 88 % of cases and is a sizable tendon located in close proximity to the semimembranosus tendon. Because it is uncommonly completely torn (6 %) in cases of complete hamstring avulsion, radiologists should be aware of its presence and appearance to avoid diagnostic confusion.

  19. Tolerance to Non-Opioid Analgesics is Opioid Sensitive in the Nucleus Raphe Magnus

    PubMed Central

    Tsagareli, Merab G.; Nozadze, Ivliane; Tsiklauri, Nana; Gurtskaia, Gulnaz

    2011-01-01

    Repeated injection of opioid analgesics can lead to a progressive loss of effect. This phenomenon is known as tolerance. Several lines of investigations have shown that systemic, intraperitoneal administration or the microinjection of non-opioid analgesics, non-steroidal anti-inflammatory drugs (NSAIDs) into the midbrain periaqueductal gray matter induces antinociception with some effects of tolerance. Our recent study has revealed that microinjection of three drugs analgin, ketorolac, and xefocam into the central nucleus of amygdala produce tolerance to them and cross-tolerance to morphine. Here we report that repeated administrations of these NSAIDs into the nucleus raphe magnus (NRM) in the following 4 days result in progressively less antinociception compare to the saline control, i.e., tolerance develops to these drugs in male rats. Special control experiments showed that post-treatment with the μ-opioid antagonist naloxone into the NRM significantly decreased antinociceptive effects of NSAIDs on the first day of testing in the tail-flick (TF) reflex and hot plate (HP) latency tests. On the second day, naloxone generally had trend effects in both TF and HP tests and impeded the development of tolerance to the antinociceptive effect of non-opioid analgesics. These findings strongly support the suggestion of endogenous opioid involvement in NSAIDs antinociception and tolerance in the descending pain-control system. Moreover, repeated injections of NSAIDs progressively lead to tolerance to them, cross-tolerance to morphine, and the risk of a withdrawal syndrome. Therefore, these results are important for human medicine too. PMID:21845173

  20. Neurotensin excitation of serotonergic neurons in the rat nucleus raphe magnus: ionic and molecular mechanisms.

    PubMed

    Li, A H; Yeh, T H; Tan, P P; Hwang, H M; Wang, H L

    2001-06-01

    To understand the cellular and molecular mechanisms by which neurotensin (NT) induces an analgesic effect in the nucleus raphe magnus (NRM), whole-cell patch-clamp recordings were performed to investigate the electrophysiological effects of NT on acutely dissociated NRM neurons. Two subtypes of neurons, primary serotonergic and secondary non-serotonergic cells, were identified from acutely isolated NRM neurons. During current-clamp recordings, NT depolarized NRM serotonergic neurons and evoked action potentials. Voltage-clamp recordings showed that NT excited serotonergic neurons by enhancing a voltage-insensitive and non-selective cationic conductance. Both SR48692, a selective antagonist of subtype 1 neurotensin receptor (NTR-1), and SR 142948A, a non-selective antagonist of NTR-1 and subtype 2 neurotensin receptor (NTR-2), failed to prevent neurotensin from exciting NRM serotonergic neurons. NT-evoked cationic current was inhibited by the intracellular administration of GDP-beta-S. NT failed to induce cationic currents after dialyzing serotonergic neurons with the anti-G(alphaq/11) antibody. Cellular Ca(2+) imaging study using fura-2 showed that NT induced the calcium release from the intracellular store. NT-evoked current was blocked after the internal perfusion of heparin, an IP(3) receptor antagonist, or BAPTA, a fast Ca(2+) chelator. It is concluded that neurotensin enhancement of the cationic conductance of NRM serotonergic neurons is mediated by a novel subtype of neurotensin receptors. The coupling mechanism via G(alphaq/11) proteins is likely to involve the generation of IP(3), and subsequent IP(3)-evoked Ca(2+) release from intracellular stores results in activating the non-selective cationic conductance.

  1. Tolerance to Non-Opioid Analgesics is Opioid Sensitive in the Nucleus Raphe Magnus.

    PubMed

    Tsagareli, Merab G; Nozadze, Ivliane; Tsiklauri, Nana; Gurtskaia, Gulnaz

    2011-01-01

    Repeated injection of opioid analgesics can lead to a progressive loss of effect. This phenomenon is known as tolerance. Several lines of investigations have shown that systemic, intraperitoneal administration or the microinjection of non-opioid analgesics, non-steroidal anti-inflammatory drugs (NSAIDs) into the midbrain periaqueductal gray matter induces antinociception with some effects of tolerance. Our recent study has revealed that microinjection of three drugs analgin, ketorolac, and xefocam into the central nucleus of amygdala produce tolerance to them and cross-tolerance to morphine. Here we report that repeated administrations of these NSAIDs into the nucleus raphe magnus (NRM) in the following 4 days result in progressively less antinociception compare to the saline control, i.e., tolerance develops to these drugs in male rats. Special control experiments showed that post-treatment with the μ-opioid antagonist naloxone into the NRM significantly decreased antinociceptive effects of NSAIDs on the first day of testing in the tail-flick (TF) reflex and hot plate (HP) latency tests. On the second day, naloxone generally had trend effects in both TF and HP tests and impeded the development of tolerance to the antinociceptive effect of non-opioid analgesics. These findings strongly support the suggestion of endogenous opioid involvement in NSAIDs antinociception and tolerance in the descending pain-control system. Moreover, repeated injections of NSAIDs progressively lead to tolerance to them, cross-tolerance to morphine, and the risk of a withdrawal syndrome. Therefore, these results are important for human medicine too.

  2. Increased glutamate synaptic transmission in the nucleus raphe magnus neurons from morphine-tolerant rats.

    PubMed

    Bie, Bihua; Pan, Zhizhong Z

    2005-02-09

    Currently, opioid-based drugs are the most effective pain relievers that are widely used in the treatment of pain. However, the analgesic efficacy of opioids is significantly limited by the development of tolerance after repeated opioid administration. Glutamate receptors have been reported to critically participate in the development and maintenance of opioid tolerance, but the underlying mechanisms remain unclear. Using whole-cell voltage-clamp recordings in brainstem slices, the present study investigated chronic morphine-induced adaptations in glutamatergic synaptic transmission in neurons of the nucleus raphe magnus (NRM), a key supraspinal relay for pain modulation and opioid analgesia. Chronic morphine significantly increased glutamate synaptic transmission exclusively in one class of NRM cells that contains mu-opioid receptors in a morphine-tolerant state. The adenylyl cyclase activator forskolin and the cAMP analog 8-bromo-cAMP mimicked the chronic morphine effect in control neurons and their potency in enhancing the glutamate synaptic current was significantly increased in neurons from morphine-tolerant rats. MDL12330a, an adenylyl cyclase inhibitor, and H89, a protein kinase A (PKA) inhibitor, reversed the increase in glutamate synaptic transmission induced by chronic morphine. In addition, PMA, a phorbol ester activator of protein kinase C (PKC), also showed an increased potency in enhancing the glutamate synaptic current in these morphine-tolerant cells. The PKC inhibitor GF109203X attenuated the chronic morphine effect. Taken together, these results suggest that chronic morphine increases presynaptic glutamate release in mu receptor-containing NRM neurons in a morphine-tolerant state, and that the increased glutamate synaptic transmission appears to involve an upregulation of both the cAMP/PKA pathway and the PKC pathway. This glutamate-mediated activation of these NRM neurons that are thought to facilitate spinal pain transmission may contribute to

  3. Authigenic albite formation due to water-rock interactions - Case study: Magnus oilfield (UK, Northern North Sea)

    NASA Astrophysics Data System (ADS)

    Mu, Nana; Fu, Yunjiao; Schulz, Hans-Martin; van Berk, Wolfgang

    2016-01-01

    It is the aim of this contribution to test whether organic-inorganic interactions could induce the formation of authigenic albite. This concept and related results are being compared with modelling scenarios which are purely based on inorganic geochemical reactions. In order to unravel the pathway of authigenic albite formation, this paper presents results of a multidisciplinary study from imaging, geochemistry, mineralogy, and hydrogeochemical modelling. The Jurassic reservoir sandstones of the Magnus oilfield (UK, North Sea) were chosen as a test site. Albite occurs with 4-18 wt.% in the Magnus sandstones and its contents vary with depth. However, albite contents increase with increasing K-feldspar contents and decreasing grain size. It occurs in three forms: (1) as lamellae in perthite, (2) as overgrowth on/in corroded feldspar, and, (3) as cloudy replacing albite patches in K-feldspar. The albite overgrowth has the highest chemical purity (100% albite) whilst albite lamellae and replacing albite patches are slightly less pure (containing 1-4% anorthite). Albite appears non-altered, and has a euhedral morphology and dull cathodoluminescence. It commonly co-occurs with corroded K-feldspar grains. The precipitation of diagenetic albite in the Magnus sandstones is attributed to deep burial 80 Ma ago and may have continued until today at temperatures between 90-120 °C. The results of hydrogeochemical modelling offer two possible pathways for the authigenic albite formation: (1) Dissolution of unstable minerals (such as kaolinite and chalcedony) coupled to reduction of ferric iron minerals by products generated during oil generation, migration and degradation; (2) Dissolution of non-end member feldspar, such as K-feldspar with 10% albite, coupled to illite formation can account for trace amounts of albite due to an elevated Na+/K+ activity ratio in the pore water.

  4. Decrease in serotonin concentration in raphe magnus nucleus and attenuation of morphine analgesia in two mice models of neuropathic pain.

    PubMed

    Sounvoravong, Sourisak; Nakashima, Mihoko N; Wada, Mitsuhiro; Nakashima, Kenichiro

    2004-01-26

    The alleviation of neuropathic pain cannot be satisfactorily achieved by treatment with opioids. There is much evidence to indicate that the active site of morphine for inducing effective analgesia is in the raphe magnus nucleus, where serotonin (5-HT, 5-hydroxytryptamine) acts as a primary transmitter. Therefore, we developed the hypothesis that 5-HT released in the raphe magnus nucleus could be related to the effectiveness of morphine in two mice models of neuropathic pain, diabetic (DM)-induced neuropathy and sciatic nerve ligation (SL). Two weeks after a single administration of streptozotocin, or 10 days after sciatic nerve ligation, mice were subcutaneously (s.c.) injected with morphine at 3, 5 and 10 mg/kg. The antinociceptive effect of morphine was estimated in the tail-pinch test; 5-HT content was measured after induction of neuropathic pain by microdialysis followed by high-performance liquid chromatography with electrochemical detection (HPLC-ECD). Morphine produced as insufficient antinociceptive effect in SL mice at all doses compared with that in sham-operated mice, while in DM mice, morphine given s.c. at 5 and 10 mg/kg produced antinociceptive effects compared with those in non-diabetic mice, but not at 3 mg/kg. The 5-HT content of dialysates, expressed as AUC for 75 min, in SL and DM mice was less than that in control mice. However, morphine given s.c. at 5 mg/kg did not significantly affect 5-HT levels in both mice models compared to their controls. These results suggest that the decrease in 5-HT levels in the raphe magnus nucleus may be related to attenuation of the analgesic effect of morphine caused by the abnormal pain state found in diabetes and partial peripheral nerve injury.

  5. Boundary layer stability on a yawed spinning body of revolution and its effect on the magnus force and moment

    NASA Technical Reports Server (NTRS)

    Jacobson, I. D.; Morton, J. B.

    1972-01-01

    The parameters are established which are important to the stability of a boundary layer flow over a yawed spinning cylinder in a uniform stream. It is shown that transition occurs asymmetrically in general and this asymmetry can be important for the prediction of aerodynamic forces and moments (e.g., the Magnus effect). Instability of the steady-state boundary layer flow is determined using small disturbance theory. Although the approach is strictly valid only for the calculation of the conditions for stability in the small, experimental data indicate that in many problems, it provides a good estimate for the transition to turbulence.

  6. [Analgesic action of microinjection of neurokinin A into the lateral reticular nucleus and nucleus raphe magnus in rats].

    PubMed

    Yan, G P; Zhao, Y; Huang, Q E; Chen, W M

    1996-10-01

    Using the microinjection technique, the analgesic effect of neurokinin A (NKA) microinjected into the lateral reticular nucleus (LRN) and nucleus raphe magnus (NRM) was investigated in lightly pentobarbital-anesthetized rats using tail flick latency (TFL) as an index. Microinjection of NKA (0.5 microgram/0.5 microliter) into LRN significantly increased TFL lasting for 10 min (n = 12, P < 0.001). Microinjection of the same amount of NKA into NRM also produced evident increase in TFL for 5 min (n = 13, P < 0.001). The results indicate that NKA modulates pain reaction in both LRN and NRM in rats.

  7. Influence of the magnus force on the motion of a spherical solid with a large angular velocity

    NASA Astrophysics Data System (ADS)

    Naumov, V. A.; Solomenko, A. D.; Yatsenko, V. P.

    1993-09-01

    The influence of the initial angular velocity imparted by an electric motor to a spherical solid on its deviation from the vertical in fall is investigated experimentally. Values of the coefficient CM in the formula for the Magnus force at which the trajectories of sphere motion are in agreement with the experimental data are found by calculation. It is established that as the Reynolds number Reω grows the coefficient CM decreases; with Reω˜3·104 CM is 10% of the quantity C{M/0} found by Rubinov and Keller for small Reynolds numbers.

  8. Vortex currents in turbulent superfluid and classical fluid channel flow, the magnus effect, and Goldstone boson fields

    SciTech Connect

    Huggins, E.R. )

    1994-09-01

    Expressing hydrodynamics in terms of the flow of vorticity, using the vortex current tensor, helps unify the picture of turbulent channel flow for viscous fluids and for superfluids. In both, eddy viscosity plays a major role in energy dissipation, and in both there is a similar cross stream flow of vorticity, which in the case of superfluids leads to the Josephson frequency. The vortex current tensor, which was introduced in an earlier paper to derive an exact three dimensional Magnus effect formula, turns out to be the classical hydrodynamic limit of the vortex current that is the source for a classical Goldstone-boson field.

  9. Adaptive camouflage: What can be learned from the wetting behaviour of the tropical flatbugs Dysodius lunatus and D. magnus.

    PubMed

    Hischen, Florian; Reiswich, Vladislav; Kupsch, Desirée; De Mecquenem, Ninon; Riedel, Michael; Himmelsbach, Markus; Weth, Agnes; Heiss, Ernst; Armbruster, Oskar; Heitz, Johannes; Baumgartner, Werner

    2017-07-27

    The neotropical flatbug species Dysodius lunatus and Dysodius magnus show a fascinating camouflage principle. Its appearance renders the animal hardly visible on the bark of trees. However, when getting wet due to rain, bark changes its colour and gets darker. In order to keep the camouflage effect, it seems as if some Dysodius species benefit from their ability to hold a water film on their cuticle and therefore change their optical properties when wetted by water too. This camouflage behaviour requires the insect to have a hydrophilic surface and passive surface structures, which facilitate the liquid spreading. Here we show morphological and chemical characterisations of the surface, especially the cuticular waxes of Dysodius magnus Scanning electron microscopy revealed that the animal is covered with pillar-like microstructures which in combination with a surprising chemical hydrophilicity of the cuticle waxes, render the bug almost superhydrophilic: Water spreads immediately across the surface. We could theoretically model this behaviour assuming the effect of hemi-wicking (a state in which a droplet sits on a rough surface, partwise imbibing the structure around). Additionally the principle was abstracted and a laser patterned polymer surface, mimicking the structure and contact angle of Dysodius-wax, shows exactly the behaviour of the natural role model - immediate spreading of water and the formation of a thin continuous water film changing optical properties of the surface. © 2017. Published by The Company of Biologists Ltd.

  10. Raphe magnus and reticulospinal actions on primary afferent depolarization of group I muscle afferents in the cat.

    PubMed Central

    Quevedo, J; Eguibar, J R; Jiménez, I; Rudomin, P

    1995-01-01

    1. In the anaesthetized cat, electrical stimulation of the bulbar reticular formation produced a short latency (2.1 +/- 0.3 ms) positive potential in the cord dorsum. In contrast, stimulation of the nucleus raphe magnus with strengths below 50 microA evoked a slow negative potential with a mean latency of 5.5 +/- 0.6 ms that persisted after sectioning the contralateral pyramid and was abolished by sectioning the ipsilateral dorsolateral funiculus. 2. The field potentials evoked by stimulation of the bulbar reticular formation and of the nucleus raphe magnus had a different intraspinal distribution, suggesting activation of different sets of segmental interneurones. 3. Stimulation of these two supraspinal nuclei produced primary afferent depolarization (PAD) in single Ib fibres and inhibited the PAD elicited by group I volleys in single Ia fibres. The inhibition of the PAD of Ia fibres produced by reticulospinal and raphespinal inputs appears to be exerted on different interneurones along the PAD pathway. 4. It is concluded that, although reticulospinal and raphespinal pathways have similar inhibitory effects on PAD of Ia fibres, and similar excitatory effects on the PAD of Ib fibres, their actions are conveyed by partly independent pathways. This would allow their separate involvement in the control of posture and movement. Images Figure 6 PMID:7738852

  11. Reproductive cycle of Ensis magnus in the Ría de Pontevedra (NW Spain): Spatial variability and fisheries management implications

    NASA Astrophysics Data System (ADS)

    Hernández-Otero, A.; Martínez-Castro, C.; Vázquez, E.; Macho, G.

    2014-08-01

    Mesoscale differences in the reproductive cycle of the commercial sword razor clam Ensis magnus (Schumacher, 1817) were studied in six shellfish beds in the Ría de Pontevedra (NW Spain) between March 2008 and July 2010. The GCI accurately described the reproductive cycle as indicated by the histological analysis. Both methods showed that the reproductive cycle was similar at different sites and was characterized by a resting stage during summer and early autumn, initiation of gametogenesis in autumn and a period of successive spawning interspersed with gonad recovery during winter and spring. However, a 15-day to one month delay in advanced stages of gametogenesis and maturation was observed between the inner and the outermost site of the ria, as well as an extended spawning period in the outermost area. Lower bottom seawater temperatures at the outermost sites appeared to delay maturation and to prolong the spawning periods, whereas salinity fluctuations at the innermost sites appeared to reduce the length of the cycle. This study provides the first estimation of the size at which E. magnus reaches sexual maturity in the Iberian Peninsula, determined in 79 mm, and it is also the first work in determining the mesoscale variation in gonadal development of any species of the superfamily Solenoidea. The results highlight the importance of carrying out mesoscale studies of the reproductive biology in coastal fisheries resources. Some of the findings of the present study have already been applied in the rotation scheme of the fishery harvesting plan.

  12. Raphe magnus and reticulospinal actions on primary afferent depolarization of group I muscle afferents in the cat.

    PubMed

    Quevedo, J; Eguibar, J R; Jiménez, I; Rudomin, P

    1995-02-01

    1. In the anaesthetized cat, electrical stimulation of the bulbar reticular formation produced a short latency (2.1 +/- 0.3 ms) positive potential in the cord dorsum. In contrast, stimulation of the nucleus raphe magnus with strengths below 50 microA evoked a slow negative potential with a mean latency of 5.5 +/- 0.6 ms that persisted after sectioning the contralateral pyramid and was abolished by sectioning the ipsilateral dorsolateral funiculus. 2. The field potentials evoked by stimulation of the bulbar reticular formation and of the nucleus raphe magnus had a different intraspinal distribution, suggesting activation of different sets of segmental interneurones. 3. Stimulation of these two supraspinal nuclei produced primary afferent depolarization (PAD) in single Ib fibres and inhibited the PAD elicited by group I volleys in single Ia fibres. The inhibition of the PAD of Ia fibres produced by reticulospinal and raphespinal inputs appears to be exerted on different interneurones along the PAD pathway. 4. It is concluded that, although reticulospinal and raphespinal pathways have similar inhibitory effects on PAD of Ia fibres, and similar excitatory effects on the PAD of Ib fibres, their actions are conveyed by partly independent pathways. This would allow their separate involvement in the control of posture and movement.

  13. Adaptive camouflage: what can be learned from the wetting behaviour of the tropical flat bugs Dysodius lunatus and Dysodius magnus

    PubMed Central

    Reiswich, Vladislav; Kupsch, Desirée; De Mecquenem, Ninon; Riedel, Michael; Himmelsbach, Markus; Weth, Agnes; Heiss, Ernst; Armbruster, Oskar; Heitz, Johannes; Baumgartner, Werner

    2017-01-01

    ABSTRACT The neotropical flat bug species Dysodius lunatus and Dysodius magnus show a fascinating camouflage principle, as their appearance renders the animal hardly visible on the bark of trees. However, when getting wet due to rain, bark changes its colour and gets darker. In order to keep the camouflage effect, it seems that some Dysodius species benefit from their ability to hold a water film on their cuticle and therefore change their optical properties when also wetted by water. This camouflage behaviour requires the insect to have a hydrophilic surface and passive surface structures which facilitate the liquid spreading. Here we show morphological and chemical characterisations of the surface, especially the cuticular waxes of D. magnus. Scanning electron microscopy revealed that the animal is covered with pillar-like microstructures which, in combination with a surprising chemical hydrophilicity of the cuticle waxes, render the bug almost superhydrophilic: water spreads immediately across the surface. We could theoretically model this behaviour assuming the effect of hemi-wicking (a state in which a droplet sits on a rough surface, partwise imbibing the structure around).  Additionally the principle was abstracted and a laser-patterned polymer surface, mimicking the structure and contact angle of Dysodius wax, shows exactly the behaviour of the natural role model – immediate spreading of water and the formation of a thin continuous water film changing optical properties of the surface. PMID:28811303

  14. Investigation of the Effect of Finite Pulse Errors on BABA Pulse Sequence Using Floquet-Magnus Expansion Approach.

    PubMed

    Mananga, Eugene S; Reid, Alicia E

    This paper presents the study of finite pulse widths for the BABA pulse sequence using the Floquet-Magnus expansion (FME) approach. In the FME scheme, the first order F1 is identical to its counterparts in average Hamiltonian theory (AHT) and Floquet theory (FT). However, the timing part in the FME approach is introduced via the Λ1 (t) function not present in other schemes. This function provides an easy way for evaluating the spin evolution during "the time in between" through the Magnus expansion of the operator connected to the timing part of the evolution. The evaluation of Λ1 (t) is useful especially for the analysis of the non-stroboscopic evolution. Here, the importance of the boundary conditions, which provides a natural choice of Λ1 (0) is ignored. This work uses the Λ1 (t) function to compare the efficiency of the BABA pulse sequence with δ - pulses and the BABA pulse sequence with finite pulses. Calculations of Λ1 (t) and F1 are presented.

  15. Modified geometrical optics of a smoothly inhomogeneous isotropic medium: the anisotropy, Berry phase, and the optical Magnus effect.

    PubMed

    Bliokh, K Yu; Bliokh, Yu P

    2004-08-01

    We present a modification of the geometrical optics method, which allows one to properly separate the complex amplitude and the phase of the wave solution. Appling this modification to a smoothly inhomogeneous isotropic medium, we show that in the first geometrical optics approximation the medium is weakly anisotropic. The refractive index, being dependent on the direction of the wave vector, contains the correction, which is proportional to the Berry geometric phase. Two independent eigenmodes of right-hand and left-hand circular polarizations exist in the medium. Their group velocities and phase velocities differ. The difference in the group velocities results in the shift of the rays of different polarizations (the optical Magnus effect). The difference in the phase velocities causes an increase of the Berry phase along with the interference of two modes leading to the familiar Rytov law about the rotation of the polarization plane of a wave. The theory developed suggests that both the optical Magnus effect and the Berry phase are accompanying nonlocal topological effects. In this paper the Hamilton ray equations giving a unified description for both of these phenomena have been derived and also a novel splitting effect for a ray of noncircular polarization has been predicted. Specific examples are also discussed.

  16. Anatomy of the Adductor Magnus Origin: Implications for Proximal Hamstring Injuries.

    PubMed

    Obey, Mitchel R; Broski, Stephen M; Spinner, Robert J; Collins, Mark S; Krych, Aaron J

    2016-01-01

    The adductor magnus (AM) has historically been a potential source of confusion in patients with suspected proximal hamstring avulsion injuries. To investigate the anatomic characteristics of the AM, including its osseous origin, anatomic dimensions, and relationship to the proximal hamstring tendons. Descriptive laboratory study. Dissection of the AM origin was performed in 11 (8 cadavers) fresh-frozen hip-to-foot cadaveric hemipelvis specimens. The gross anatomy and architecture of the proximal hamstring and AM tendons were studied. After dissecting the hamstring tendons away from their origin, the dimension, shape, and orientation of the tendon footprints on the ischial tuberosity were determined. The AM was identified in all cadaveric specimens. The mean tendon thickness (anterior to posterior [AP]) was 5.7 ± 2.9 mm. The mean tendon width (medial to lateral [ML]) was 7.1 ± 2.2 mm. The mean tendon length was 13.1 ± 8.7 cm. The mean footprint height (AP dimension) was 12.1 ± 2.9 mm, and mean footprint width (ML dimension) was 17.3 ± 7.1 mm. The mean distance between the AM footprint and the most medial aspect of the conjoint tendon footprint was 8.5 ± 4.2 mm. Tendon measurements demonstrated a considerable degree of both intra- and interspecimen variability. The AM tendon is consistently present just medial to the conjoint tendon at the ischial tuberosity, representing the lateral-most portion of the AM muscle. This study found wide variation in the dimensional characteristics of the AM tendon between specimens. Its shape and location can mimic the appearance of an intact hamstring (conjoint or semimembranosus) tendon intraoperatively or on diagnostic imaging, potentially misleading surgeons and radiologists. Therefore, detailed knowledge of the AM tendon anatomy, footprint anatomy, and its relationship to the hamstring muscle complex is paramount when planning surgical approach and technique. The reported data may aid surgeons in more accurate recognition

  17. Applications of Floquet-Magnus expansion, average Hamiltonian theory and Fer expansion to study interactions in solid state NMR when irradiated with the magic-echo sequence.

    PubMed

    Mananga, Eugene Stephane

    2013-01-01

    This work presents the possibility of applying the Floquet-Magnus expansion and the Fer expansion approaches to the most useful interactions known in solid-state nuclear magnetic resonance using the magic-echo scheme. The results of the effective Hamiltonians of these theories and average Hamiltonian theory are presented. © 2013 Elsevier Inc. All rights reserved.

  18. Applications of Floquet-Magnus expansion, average Hamiltonian theory and Fer expansion to study interactions in solid state NMR when irradiated with the magic-echo sequence

    PubMed Central

    Mananga, Eugene Stephane

    2015-01-01

    This work presents the possibility of applying the Floquet-Magnus expansion and the Fer expansion approaches to the most useful interactions known in solid-state nuclear magnetic resonance using the magic-echo scheme. The results of the effective Hamiltonians of these theories and average Hamiltonian theory are presented. PMID:24034855

  19. [On the quest for the right way--life and work of Magnus Schmid (1918-1977), historian of medicine].

    PubMed

    Mildenberger, Florian

    2008-01-01

    Magnus Schmid seems to have been an "ordinary historian of medicine" from 1950 to 1977 in Munich and Erlangen. Following his death he became forgotten by his colleagues. But despite the fact, that he did not publish great books, he modernized the subject and was open to new interpretations of history of medicine and to intercultural views on history. For more than 20 years he seemed to be a quite liberal researcher, but following the changes in society after the 1968/69 revolt, he became a fighter for a new conservatism. Schmid was unwilling to accept that people decided freely about their body and health, without consulting doctors like him while he believed in an unchangeable foundation of ethics in medicine (e. g. abortion). So Schmid, in the last years of his life to the fact, made his valuable scientific works disappear behind his dubious campaigning against the modernized western German society.

  20. Distinct effect of orphanin FQ in nucleus raphe magnus and nucleus reticularis gigantocellularis on the rat tail flick reflex.

    PubMed

    Yang, Z; Zhang, Y; Wu, G

    2001-06-22

    The aim of the present study is to investigate the effects of orphanin FQ (OFQ) microinjected into the nucleus raphe magnus (NRM) and the nucleus reticularis gigantocellularis (NGC) on pain modulation. The tail-flick latency (TFL) was used as a behavioral index of nociceptive responsiveness. The result showed microinjection of OFQ into the NRM significantly increased the TFL, whereas microinjection of OFQ into the NGC decreased the TFL, suggesting the analgesic effect of OFQ in the NRM and the hyperalgesic effect of OFQ in the NGC. As there are three classes of putative pain modulating neurons in the rostral ventromedial medulla (RVM), the hyperalgesic or analgesic effect of OFQ in the RVM might depend upon the different class of the neurons being acted.

  1. Progress in spin dynamics solid-state nuclear magnetic resonance with the application of Floquet-Magnus expansion to chemical shift anisotropy.

    PubMed

    Mananga, Eugene Stephane

    2013-01-01

    The purpose of this article is to present an historical overview of theoretical approaches used for describing spin dynamics under static or rotating experiments in solid state nuclear magnetic resonance. The article gives a brief historical overview for major theories in nuclear magnetic resonance and the promising theories. We present the first application of Floquet-Magnus expansion to chemical shift anisotropy when irradiated by BABA pulse sequence. © 2013 Elsevier Inc. All rights reserved.

  2. Progress in Spin Dynamics Solid-State Nuclear Magnetic Resonance with the Application of Floquet-Magnus Expansion to Chemical Shift Anisotropy

    PubMed Central

    Mananga, Eugene Stephane

    2013-01-01

    The purpose of this article is to present an historical overview of theoretical approaches used for describing spin dynamics under static or rotating experiments in solid state nuclear magnetic resonance. The article gives a brief historical overview for major theories in nuclear magnetic resonance and the promising theories. We present the first application of Floquet-Magnus expansion to chemical shift anisotropy when irradiated by BABA pulse sequence. PMID:23711337

  3. One-stage reconstruction of isolated and combined tendon defects with the vascularized adductor magnus tendon graft: Surgical technique and preliminary results.

    PubMed

    Neuwirth, M; Bürger, H; Palle, W; Rab, M

    2016-07-01

    Secondary reconstructions of isolated and combined tendon defects are still a challenge for plastic surgeons. Due to its reliable anatomy, reconstructive potential and low donor-site morbidity, the medial femoral condyle is an ideal area for harvesting isolated and combined tendon flaps. This study evaluates our preliminary results with the vascularized adductor magnus tendon flap. The study included six patients who received a vascularized tendon flap (upper extremity: three patients; lower extremity: three patients) from 2011 to 2015. For three patients, the adductor magnus tendon was used as a single flap; for the other three patients, the tendon was included in a composite flap. A retrospective chart review provided the patients' demographic data, surgical details and the post-operative course. The further objective and patient-reported outcome was evaluated with a long-term follow-up. All of the free vascularized flaps healed without complications and with good vascularization upon duplex ultrasonography. One patient did, however, require revision surgery in the late post-operative course. At the end point, all patients showed good functional results without any donor-site morbidity. For carefully selected isolated and combined tendon defects on the upper and lower extremities, the vascularized adductor magnus tendon flap provides a reliable and versatile method for microsurgical reconstruction. Copyright © 2016 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.

  4. Equivalence of the Floquet-Magnus and Fer Expansions to Investigate the Dynamics of a Spin System in the Three-Level System.

    PubMed

    Mananga, Eugene Stephane

    2017-08-17

    In this work, we investigated the orders to which the Floquet-Magnus expansion (FME) and Fer expansion (FE) are equivalent or different for the three-level system. Specifically, we performed the third-order calculations of both approaches based on elegant integrations formalism. We present an important close relationship between the Floquet-Magnus and Fer expansions. As the propagator from the FME takes the form of the evolution operator, which removes the constraint of a stroboscopic observation, we appreciated the effects of time-evolution under Hamiltonians with different orders separately. Our work unifies and generalizes existing results of Floquet-Magnus and Fer approaches and delivers illustrations of novel springs that boost previous applications that are based on the classical information. Due to the lack of an unequivocal relationship between the FME and FE, some disagreements between the results produced by these theories will be found, especially in NMR experiments. Our results can find applications in the optimization of NMR spectroscopy, quantum computation, quantum optical control, and coherence in optics and might bear new awareness in fundamental perusals of quantum spin dynamics. This work is an important theoretical and numerical contribution in the general field of spin dynamics.

  5. A remarkable new species of the magnus species-group of Cryptocellus (Arachnida, Ricinulei) from Ecuador, with observations on the taxonomy of the New World genera.

    PubMed

    Botero-Trujillo, Ricardo; Valdez-Mondragón, Alejandro

    2016-05-03

    A new ricinuleid species, Cryptocellus chimaera sp. nov., is described based on a male specimen from Northwest Ecuador (Esmeraldas, Reserva Ecológica Mache-Chindul, Estación Biológica Bilsa). This species is unique among all Cryptocellus in having very large longitudinal carapacial translucent areas together with a markedly incrassate femur of leg II. Representing only the second species of the order described from Ecuador, C. chimaera sp. nov. is assigned to the magnus species-group of Cryptocellus Westwood, 1874. Cryptocellus chimaera sp. nov. is remarkable, for its morphology resembles that of Cryptocellus magnus Ewing, 1929, especially with regard to the male copulatory apparatus, although both resemble Pseudocellus Platnick, 1980, due to the presence of diffuse longitudinal carapacial translucent areas. Along with the new species description, a comparative diagnosis and supplementary images are provided for C. magnus. Based on direct observations of some species belonging to the five species-groups of Cryptocellus, we discuss on the occurrence of different morphologies of carapacial translucent areas within the genus. We deem it important to continue the survey of morphological characters, especially within Cryptocellus, in order to increase our understanding of the species-groups and to unravel their relationships.

  6. Role of the red nucleus in suppressing the jaw-opening reflex following stimulation of the raphe magnus nucleus.

    PubMed

    Satoh, Yoshihide; Ishizuka, Ken'Ichi; Iwasaki, Shin-ichi

    2014-08-01

    In a previous study, we found that electrical and chemical stimulation of the red nucleus (RN) suppressed the high-threshold afferent-evoked jaw-opening reflex (JOR). It has been reported that the RN receives bilaterally projection fibers from the raphe magnus nucleus (RMg), and that stimulation of the RMg inhibits the tooth pulp-evoked nociceptive JOR. These facts imply that RMg-induced inhibition of the JOR could be mediated via the RN. The present study first examines whether stimulation of the RMg suppresses the high-threshold afferent-evoked JOR. The JOR was evoked by electrical stimulation of the inferior alveolar nerve (IAN), and was recorded as the electromyographic response of the anterior belly of the digastric muscle. The stimulus intensity was 4.0 (high-threshold) times the threshold. Conditioning electrical stimulation of the RMg significantly suppressed the JOR. A further study then examined whether electrically induced lesions of the RN or microinjection of muscimol into the RN affects RMg-induced suppression of the JOR. Electrically induced lesions of the bilateral RN and microinjection of muscimol into the bilateral RN both reduced the RMg-induced suppression of the JOR. These results suggest that RMg-induced suppression of the high-threshold afferent-evoked JOR is mediated by a relay in the RN. Copyright © 2014 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.

  7. On the nameless love and infinite sexualities: John Henry Mackay, Magnus Hirschfeld and the origins of the sexual emancipation movement.

    PubMed

    Bauer, J Edgar

    2005-01-01

    Two prominent representatives of the sexual emancipation movement in Germany, John Henry Mackay (1864-1933) and Magnus Hirschfeld (1868-1935) launched significant attacks on sexual binarism and its combinatories. Although Mackay defended the nameless love against seminal Christian and subsequent secularised misconstructions of its nature, he was unable to overcome the fundamental scheme of binomic sexuality. Hirschfeld, however, resolved the theoretical issue through his doctrine of sexual intermediaries (Zwischenstufenlehre) which purports that-without exception- all human beings are intersexual variants, i.e. unique composites of different proportions of masculinity and femininity. Since these proportions vary from one sexual layer of description to another in the same individual and can alter or be altered in time, it is sensu stricto not possible implies a radical deconstruction of not only binomic sexuality but its supplementation through a third sex. It offers a meta-theoretical framework for rethinking sexual difference beyond the fictional schemes and categorial closures of Western traditions of sexual identity. His assumption of potentially infinite sexualities anticipates some of the basic tenets forwarded by the philosophical and political agendas of queer studies. to postulate discrete sexual categories. Hirschfeld's doctrine.

  8. Antinociceptive role of oxytocin in the nucleus raphe magnus of rats, an involvement of mu-opioid receptor.

    PubMed

    Wang, Jing-Wen; Lundeberg, Thomas; Yu, Long-Chuan

    2003-10-15

    Recent studies showed that oxytocin plays an important role in nociceptive modulation in the central nervous system. The present study was undertaken to investigate the role of oxytocin in antinociception in the nucleus raphe magnus (NRM) of rats and the possible interaction between oxytocin and the opioid systems. Intra-NRM injection of oxytocin induced dose-dependent increases in hindpaw withdrawal latencies (HWLs) to noxious thermal and mechanical stimulation in rats. The antinociceptive effect of oxytocin was significantly attenuated by subsequent intra-NRM injection of the oxytocin antagonist 1-deamino-2-D-Tyr-(Oet)-4-Thr-8-Orn-oxytocin. Intra-NRM injection of naloxone dose-dependently antagonized the increased HWLs induced by preceding intra-NRM injection of oxytocin, indicating an involvement of opioid receptors in oxytocin-induced antinociception in the NRM of rats. Furthermore, the antinociceptive effect of oxytocin was dose-dependently attenuated by subsequent intra-NRM injection of the mu-opioid antagonist beta-funaltrexamine (beta-FNA), but not by the kappa-opioid antagonist nor-binaltorphimine (nor-BNI) or the delta-opioid antagonist naltrindole. The results demonstrated that oxytocin plays an antinociceptive role in the NRM of rats through activating the oxytocin receptor. Moreover, mu-opioid receptors, not kappa and delta receptors, are involved in the oxytocin-induced antinociception in the NRM of rats.

  9. NON-STEROIDAL ANTI-INFLAMMATORY DRUGS'S ANTINOCICEPTION MEDIATED BY THE OPIOID MECHANISM IN THE NUCLEUS RAPHE MAGNUS.

    PubMed

    Gorgiladze, T; Nozadze, I; Abzianidze, E; Tsagareli, M

    2017-04-01

    It has been established that the midbrain periaqueductal gray matter (PAG) and rostral ventro-medial medulla (RVM) are involved in the descending pain control system. The latter involves the midline nucleus raphe magnus (NRM) and adjacent reticular formation. These brain structures are is one of important parts of CNS circuit that controls nociceptive transmission at the level of spinal cord. Here we report that microinjection of commonly used non-steroidal anti-inflammatory drugs (NSAIDs), diclofenac, ketorolac, metamizol, and xefocam into the NRM produces strong antinociception which is mediated by the opioid mechanism. The experiments were carried out on experimental and control (saline) white albino male rats. Animals were implanted with a guide cannula in the NRM and tested for antinociception following microinjection of NSAIDs into the NRM in the tail flick (TF) and hot plate (HP) tests. The analysis of variance (ANOVA) with post-hoc Tukey-Kramer multiple comparison tests were used for statistical evaluation. The obtained data show that microinjection of these NSAIDs into the NRM produced antinociception as revealed by a latency increase in the tail-flick (TF) and hot plate (HP) latencies compared to the saline control microinjected into the same nucleus. Furthermore, we definitely showed that pre-treatment with opioid antagonist naloxone in the NRM diminishes NSAID-induced antinociception expressing in significant decrease in TF and HP latencies (P<0.001). The present findings support the concept that antinociceptive effects of NSAIDs are mediated via an endogenous opioid system possibly involving the descending pain modulatory circuit.

  10. Role of opioidergic and GABAergic neurotransmission of the nucleus raphe magnus in the modulation of tonic immobility in guinea pigs.

    PubMed

    da Silva, Luis Felipe Souza; Menescal-de-Oliveira, Leda

    2007-04-02

    Tonic immobility (TI) is an inborn defensive behavior characterized by a temporary state of profound and reversible motor inhibition elicited by some forms of physical restraint. Previous results from our laboratory have demonstrated that nucleus raphe magnus (NRM) is also a structure involved in the modulation of TI behavior, as chemical stimulation through carbachol decreases the duration of TI in guinea pigs. In view of the fact that GABAergic and opioidergic circuits participate in the regulation of neuronal activity in the NRM and since these neurotransmitters are also involved in the modulation of TI, the objective of the present study was to evaluate the role of these circuits of the NRM in the modulation of the behavioral TI response. Microinjection of morphine (4.4 nmol/0.2 microl) or bicuculline (0.4 nmol/0.2 microl) into the NRM increased the duration of TI episodes while muscimol (0.5 nmol/0.2 microl) decreased it. The effect of morphine injection into the NRM was blocked by previous microinjection of naloxone (2.7 nmol/0.2 microl). Muscimol at 0.25 nmol did not produce any change in TI duration; however, it blocked the increased response induced by morphine. Our results indicate a facilitatory role of opioidergic neurotransmission in the modulation of the TI response within the NRM, whereas GABAergic activity plays an inhibitory role. In addition, in the present study the modulation of TI in the NRM possibly occurred via an interaction between opioidergic and GABAergic systems, where the opioidergic effect might be due to inhibition of tonically active GABAergic interneurons.

  11. Total syntheses of (±)-spiroindimicins B and C enabled by a late-stage Schöllkopf-Magnus-Barton-Zard (SMBZ) reaction.

    PubMed

    Blair, Lachlan M; Sperry, Jonathan

    2016-01-14

    The spiroindimicins are a family of structurally unprecedented alkaloids isolated from the deep-sea-derived marine actinomycete Streptomyces sp. SCSIO 03032. The total syntheses of (±)-spiroindimicins B and C are disclosed, the first of any member of this family. Central to the successful strategy was installing the spirocentre using a mild intramolecular Heck reaction, the assembly of a pentacyclic spirobisindole by Fischer indolization and a late-stage Schöllkopf-Magnus-Barton-Zard (SMBZ) reaction to construct the trisubstituted pyrrole.

  12. The statesman and the ophthalmologist: Gladstone and Magnus on the evolution of human colour vision, one small episode of the nineteenth-century Darwinian debate.

    PubMed

    Bellmer, E H

    1999-01-01

    Among the numerous nineteenth-century sorties into particular aspects of the Darwinian debate are two 1877 publications. The first, Die Geschichtliche Entwickelung des Farbensinnes, was a treatise on the evolutionary development of human colour vision by Hugo Magnus, an obscure German ophthalmologist. The other, The Colour-Sense, was an article by William Ewart Gladstone, the great British statesman. Magnus, working from linguistic science and optical physiology, developed the theory that humankind had passed through successive stages of colour recognition, from none to full perception, brightest colours first. Gladstone supported the theory with data from his studies of Homeric colour words, placing Homer at a very early stage. Their theory was not accepted. It assumed colour vocabulary to be an index of colour recognition, and too little was known about the nature or age of early man. The present study intends to follow this particular episode as an excellent example of the scholarship, argumentation, and limited scientific knowledge of the time, as applied to human evolution.

  13. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003206 (18 Jan. 2011) --- NASA astronauts Ron Garan (left foreground), Expedition 27/28 flight engineer; Mike Fossum (second left), Expedition 28 flight engineer and Expedition 29 commander; Rex Walheim and Sandy Magnus, both STS-135 mission specialists, use the virtual reality lab in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to train for some of their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare crew members for dealing with space station elements. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  14. Mercury and sulphur among the High Medieval alchemists: from Rāzī and Avicenna to Albertus Magnus and pseudo-Roger Bacon.

    PubMed

    Newman, William R

    2014-11-01

    This essay challenges the often expressed view that the principles of metals, namely mercury and sulphur, were generally viewed by alchemists as being of a 'metaphysical' character that made them inaccessible to the tools and operations of the laboratory. By examining a number of Arabo-Latin and Latin alchemical texts in circulation before the end of the thirteenth century, the author presents evidence that most alchemists of the period considered mercury and sulphur to be materials subject to techniques of purification in the same way that naturally occurring salts and minerals could be freed of their impurities or dross. The article also points to the immense influence of Avicenna and Albertus Magnus in formulating the theory that mercury and sulphur were compounds of different materials, containing both fixed and unfixed components. Finally, the author briefly examines the relationship between this materialist approach to the principles and the chymical atomism of early modern authors who were deeply aware of medieval alchemical literature.

  15. Efficient theory of dipolar recoupling in solid-state nuclear magnetic resonance of rotating solids using Floquet-Magnus expansion: application on BABA and C7 radiofrequency pulse sequences.

    PubMed

    Mananga, Eugene S; Reid, Alicia E; Charpentier, Thibault

    2012-02-01

    This article describes the use of an alternative expansion scheme called Floquet-Magnus expansion (FME) to study the dynamics of spin system in solid-state NMR. The main tool used to describe the effect of time-dependent interactions in NMR is the average Hamiltonian theory (AHT). However, some NMR experiments, such as sample rotation and pulse crafting, seem to be more conveniently described using the Floquet theory (FT). Here, we present the first report highlighting the basics of the Floquet-Magnus expansion (FME) scheme and hint at its application on recoupling sequences that excite more efficiently double-quantum coherences, namely BABA and C7 radiofrequency pulse sequences. The use of Λ(n)(t) functions available only in the FME scheme, allows the comparison of the efficiency of BABA and C7 sequences.

  16. Anti-nociceptive effects of calcitonin gene-related peptide in nucleus raphe magnus of rats: an effect attenuated by naloxone.

    PubMed

    Huang, Y; Brodda-Jansen, G; Lundeberg, T; Yu, L C

    2000-08-04

    The present study investigated the role of calcitonin gene-related peptide (CGRP) on nociception in nucleus raphe magnus (NRM) and the interaction between CGRP and opioid peptides in NRM of rats. CGRP-like immunoreactivity was found at a concentration of 6.0+/-0. 77 pmol/g in NRM tissue of ten samples of rats, suggesting that it may contribute to physiological responses orchestrated by the NRM. The hindpaw withdrawal latency (HWL) to thermal and mechanical stimulation increased significantly after intra-NRM administration of 0.5 or 1 nmol of CGRP in rats, but not 0.25 nmol. The anti-nociceptive effect induced by CGRP was antagonized by following intra-NRM injection of 1 nmol of the CGRP receptor antagonist CGRP8-37. Furthermore, the CGRP-induced anti-nociceptive effect was attenuated by following intra-NRM administration of 6 nmol of naloxone. The results indicate that CGRP and its receptors play an important role in anti-nociception, and there is a possible interaction between CGRP and opioid peptides in NRM of rats.

  17. Effects of electroacupuncture on orphanin FQ immunoreactivity and preproorphanin FQ mRNA in nucleus of raphe magnus in the neuropathic pain rats.

    PubMed

    Ma, Fei; Xie, Hong; Dong, Zhi-Qiang; Wang, Yan-Qing; Wu, Gen-Cheng

    2004-07-15

    Orphanin FQ (OFQ) is an endogenous ligand for opioid receptor-like-1 (ORL1) receptor. Previous studies have shown that both OFQ immunoreactivity and preproorphanin FQ (ppOFQ) mRNA expression could be observed in the brain regions involved in pain modulation, e.g., nucleus of raphe magnus (NRM), dorsal raphe nucleus (DRN), and ventrolateral periaqueductal gray (vlPAG). It was reported that electroacupuncture (EA) has analgesic effect on neuropathic pain, and the analgesic effect was mediated by the endogenous opioid peptides. In the present study, we investigated the effects of EA on the changes of OFQ in the neuropathic pain rats. In the sciatic nerve chronic constriction injury (CCI) model, we investigated the changes of ppOFQ mRNA and OFQ immunoreactivity in NRM after EA by in situ hybridization (ISH) and immunohistochemistry methods, respectively. Then, the ppOFQ mRNA-positive and OFQ immunoreactive cells were counted under a computerized image analysis system. The results showed that expression of ppOFQ mRNA decreased and OFQ immunoreactivity increased after EA treatment in the neuropathic pain rats. These results indicated that EA modulated OFQ synthesis and OFQ peptide level in NRM of the neuropathic pain rats.

  18. TMJ inflammation increases Fos expression in the nucleus raphe magnus induced by subsequent formalin injection of the masseter or hindpaw of rats.

    PubMed

    Oh, Sang-Hoon; Imbe, Hiroki; Iwai-Liao, Yasutomo

    2006-08-01

    The study was designed to examine the effect of persistent temporomandibular joint (TMJ) inflammation on neuronal activation in the descending pain modulatory system in response to noxious stimulus. Formalin was injected into the left masseter muscle or hindpaw of rats 10 days after injection of the left TMJ with saline or complete Freund's adjuvant (CFA). The results showed that 10-day persistent TMJ inflammation (induced by CFA) alone did not induce a significant increase in Fos-like immunoreactive (Fos-LI) neurons in the rostral ventromedial medulla (RVM) or locus coeruleus (LC), but that formalin injection of the masseter muscle or hindpaw induced a significant increase in Fos-LI neurons in the RVM and LC of rats with and without TMJ inflammation (P < 0.05). However, persistent TMJ inflammation significantly increased Fos-LI neurons in the nucleus raphe magnus (NRM) induced by subsequent formalin injection of the masseter muscle and hindpaw (70.2% increase and 53.8% increase, respectively, over the control TMJ-saline-injected rats; P < 0.05). The results suggest that persistent TMJ inflammation increases neuronal activity, in particularly in the NRM, by the plastic change of the descending pain modulatory system after ipsilateral application of a noxious stimulus to either orofacial area or a spatially remote body area.

  19. Role of glutamatergic receptors located in the nucleus raphe magnus on antinociceptive effect of morphine microinjected into the nucleus cuneiformis of rat.

    PubMed

    Haghparast, Abbas; Soltani-Hekmat, Ava; Khani, Abbas; Komaki, Alireza

    2007-10-29

    Neurons in the nucleus cuneiformis (CnF), located just ventrolateral to the periaqueductal gray, project to medullary nucleus raphe magnus (NRM), which is a key medullary relay for descending pain modulation and is critically involved in opioid-induced analgesia. Previous studies have shown that antinociceptive response of CnF-microinjected morphine can be modulated by the specific subtypes of glutamatergic receptors within the CnF. In this study, we evaluated the role of NMDA and kainate/AMPA receptors that are widely distributed within the NRM on morphine-induced antinociception elicited from the CnF. Hundred and five male Wistar rats weighing 250-300 g were used. Morphine (10, 20 and 40 microg) and NMDA receptor antagonist, MK-801 (10 microg) or kainate/AMPA receptor antagonist, DNQX (0.5 microg) in 0.5 microl saline were stereotaxically microinjected into the CnF and NRM, respectively. The latency of tail-flick response was measured at set intervals (2, 7, 12, 17, 22, 27 min after microinjection) by using an automated tail-flick analgesiometer. The results showed that morphine microinjection into the CnF dose-dependently causes increase in tail-flick latency (TFL). MK-801 microinjected into the NRM, just 1 min before morphine injection into the CnF, significantly attenuated antinociceptive effects of morphine. On the other hand, DNQX microinjected into the NRM, significantly increased TFL after local application of morphine into the CnF. We suggest that morphine related antinociceptive effect elicited from the CnF is mediated, in part, by NMDA receptor at the level of the NRM whereas kainite/AMPA receptor has a net inhibitory influence at the same pathway.

  20. Electrolytic lesion of the nucleus raphe magnus reduced the antinociceptive effects of bilateral morphine microinjected into the nucleus cuneiformis in rats.

    PubMed

    Haghparast, Abbas; Ordikhani-Seyedlar, Mehdi; Ziaei, Maryam

    2008-06-27

    Several lines of investigation show that the rostral ventromedial medulla is a critical relay for midbrain regions, including the nucleus cuneiformis (CnF), which control nociception at the spinal cord. There is some evidence that local stimulation or morphine administration into the CnF produces the effective analgesia through the nucleus raphe magnus (NRM). The present study tries to determine the effect of morphine-induced analgesia following microinjection into the CnF in the absence of NRM. Seven days after the cannulae implantation, morphine was microinjected bilaterally into the CnF at the doses of 0.25, 1, 2.5, 5, 7.5 and 10 microg/0.3 microl saline per side. The morphine-induced antinociceptive effect measured by tail-flick test at 30, 60, 90 and 120 min after microinjection. The results showed that bilateral microinjection of morphine into the CnF dose-dependently causes increase in tail-flick latency (TFL). The 50% effective dose of morphine was determined and microinjected into the CnF (2.5 microg/0.3 microl saline per side) in rats after NRM electrolytic lesion (1 mA, 30 s). Lesion of the NRM significantly decreased TFLs, 30 (P<0.01) and 60 (P<0.05) but not 90-120 min after morphine microinjection into the CnF, compared with sham-lesion group. We concluded that morphine induces the analgesic effects through the opioid receptors in the CnF. It is also appeared that morphine-induced antinociception decreases following the NRM lesion but it seems that there are some other descending pain modulatory pathways that activate in the absence of NRM.

  1. Antinociception induced by intravenous dipyrone (metamizol) upon dorsal horn neurons: involvement of endogenous opioids at the periaqueductal gray matter, the nucleus raphe magnus, and the spinal cord in rats.

    PubMed

    Vazquez, Enrique; Hernandez, Norma; Escobar, William; Vanegas, Horacio

    2005-06-28

    Microinjection of dipyrone (metamizol) into the periaqueductal gray matter (PAG) in rats causes antinociception. This is mediated by endogenous opioidergic circuits located in the PAG itself, in the nucleus raphe magnus and adjacent structures, and in the spinal cord. The clinical relevance of these findings, however, is unclear. Therefore, in the present study, dipyrone was administered intravenously, and the involvement of endogenous opioidergic circuits in the so-induced antinociception was investigated. In rats, responses of dorsal spinal wide-dynamic range neurons to mechanical noxious stimulation of a hindpaw were strongly inhibited by intravenous dipyrone (200 mg/kg). This effect was abolished by microinjection of naloxone (0.5 microg/0.5 microl) into the ventrolateral and lateral PAG or into the nucleus raphe magnus or by direct application of naloxone (50 microg/50 microl) onto the spinal cord surface above the recorded neuron. These results show that dipyrone, a non-opioid analgesic with widespread use in Europe and Latin America, when administered in a clinically relevant fashion causes antinociception by activating endogenous opioidergic circuits along the descending pain control system.

  2. Physiological characteristics of the projection pathway from the medial preoptic to the nucleus raphe magnus of the rat and its modulation by the periaqueductal gray.

    PubMed

    Jiang, M; Behbehani, M M

    2001-11-01

    Anatomical studies have shown a strong projection from the medial preoptic nucleus of the hypothalamus (MPO) to both the periaqueductal gray (PAG) and nucleus raphe magnus (NRM). In this study, we examined the physiological characteristics of MPO to NRM connections and examined how blockade of neuronal transmission and of the glutamatergic system within the PAG modifies this pathway. In deeply anesthetized rats, recordings were made from NRM neurons that were identified by their response to peripheral mechanical stimulation and designated as "E", "I", or "N" if they were excited, inhibited, or not activated by noxious stimulation. In addition, cells were identified as spinally projecting if they could be antidromically activated by stimulation of the dorsolateral funiculus at the thoracic level. The responses of 204 NRM neurons to electrical and 87 cells to both chemical and electrical stimulation of MPO were recorded. The response of NRM neurons to MPO stimulation was highly dependent on the sensory class of these cells. Chemical stimulation of MPO inhibited 50% (16/32) and excited 16% (5/32) of the I-cells. In contrast, 23% (9/39) of the E-cells were inhibited and 49% (19/39) were excited by chemical stimulation of MPO. Electrical stimulation at intensities below 80 microA at 100Hz had similar effects on the two classes of cells; 62% (24/39) of the E-cells and 31% (10/32) of the I cells were excited, and 31% (12/39) of the E-cells and 59% (19/32) of the I-cells were inhibited. The excitatory response to chemical stimulation lasted for an average of 136.8+/-73.2s and inhibitory response lasted for an average of 143.8+/-102.1s. Electrical stimulation of MPO at 1Hz excited 27%, inhibited 3%, and had no effect on 70% of NRM cells. The mean latency to peak excitation was 9.6+/-6.6ms. Antidromic activation of MPO neurons by NRM stimulation showed an average latency of 6.3+/-3.4ms. Blocking the glutamatergic transmission within the PAG (by injecting kynurenic acid (KYN

  3. Analytical calculation of the Smith lifetime Q matrix using a Magnus propagator: Applications to the study of resonances occurring in ultracold inelastic collisions with and without an applied magnetic field

    NASA Astrophysics Data System (ADS)

    Guillon, G.; Stoecklin, T.

    2009-04-01

    We take advantage of the simple expression of the sector adiabatic wave functions of the Magnus propagator to obtain accurate values of the energy derivative of the S matrix which, in turn, is used to get the Smith lifetime Q matrix. The procedure involves the simultaneous generation of both the R matrix and its energy derivative dR /dE which are propagated along the scattering coordinate. We present a few examples of application to the field free He-N2+ inelastic collisions which we previously studied. This method is then applied to the calculation of the lifetime of tuned zero energy Feshbach resonances using a magnetic field. We give and discuss the law of variation as a function of the magnetic field of the Q matrix eigenvalues across such resonance. Some examples of application are given for the He-N2+ collisions in a magnetic field.

  4. Analytical calculation of the Smith lifetime Q matrix using a Magnus propagator: applications to the study of resonances occurring in ultracold inelastic collisions with and without an applied magnetic field.

    PubMed

    Guillon, G; Stoecklin, T

    2009-04-14

    We take advantage of the simple expression of the sector adiabatic wave functions of the Magnus propagator to obtain accurate values of the energy derivative of the S matrix which, in turn, is used to get the Smith lifetime Q matrix. The procedure involves the simultaneous generation of both the R matrix and its energy derivative dR/dE which are propagated along the scattering coordinate. We present a few examples of application to the field free He-N(2)(+) inelastic collisions which we previously studied. This method is then applied to the calculation of the lifetime of tuned zero energy Feshbach resonances using a magnetic field. We give and discuss the law of variation as a function of the magnetic field of the Q matrix eigenvalues across such resonance. Some examples of application are given for the He-N(2)(+) collisions in a magnetic field.

  5. Magnus and Iordanskii Forces in Superfluids

    SciTech Connect

    Wexler, C.

    1997-08-01

    The transverse force acting on a quantized vortex in a superfluid is a problem that has eluded a complete understanding for more than three decades. In this Letter I calculate the {ital superfluid } velocity part of the transverse force in a way closely related to Laughlin{close_quote}s argument for the quantization of conductance in the quantum Hall effect. A combination of this result, the {ital vortex} velocity part of the transverse force found by Thouless, Ao, and Niu [Phys.Rev.Lett.{bold 76}, 3758 (1996)], and Galilean invariance shows that there cannot be a transverse force proportional to the normal fluid velocity. {copyright} {ital 1997} {ital The American Physical Society}

  6. 5-Hydroxytryptamine2A/2C receptors of nucleus raphe magnus and gigantocellularis/paragigantocellularis pars α reticular nuclei modulate the unconditioned fear-induced antinociception evoked by electrical stimulation of deep layers of the superior colliculus and dorsal periaqueductal grey matter.

    PubMed

    de Oliveira, Ricardo; de Oliveira, Rithiele Cristina; Falconi-Sobrinho, Luiz Luciano; da Silva Soares, Raimundo; Coimbra, Norberto Cysne

    2017-01-01

    The electrical stimulation of the dorsolateral columns of the periaquedutal grey matter (dlPAG) or deep layers of the superior colliculus (dlSC) evokes defensive behaviours followed by an antinociceptive response. Monoaminergic brainstem reticular nuclei are suggested to comprise the endogenous pain modulatory system. The aim of the present work was to investigate the role played by 5-HT2 subfamily of serotonergic receptors of the nucleus raphe magnus (NRM) and the gigantocellularis/paragigantocellularis pars α reticular nuclei (Gi/PGiα) in the elaboration of instinctive fear-induced antinociception elicited by electrical stimulation of dlPAG or of dlSC. The nociceptive thresholds were measured by the tail-flick test in Wistar rats. The 5-HT2A/2C-serotonergic receptors antagonist ritanserin was microinjected at different concentrations (0.05, 0.5 and 5.0μg/0.2μL) either in Gi/PGiα or in NRM. The blockade of 5-HT2 receptors in both Gi/PGiα and NRM decreased the innate fear-induced antinociception elicited by electrical stimulation of the dlSC or the dlPAG. These findings indicate that serotonin is involved in the hypo-algesia induced by unconditioned fear-induced behavioural responses and the 5-HT2A/2C-serotonergic receptor subfamily in neurons situated in the Gi/PGiα complex and NRM are critically recruited in pain modulation during the panic-like emotional behaviour. Copyright © 2016 Elsevier B.V. All rights reserved.

  7. Computations of Projectile Magnus Effect at Transonic Velocities

    DTIC Science & Technology

    1983-08-01

    memory , the use of computational methods in design becomes more of a reality. The means to compute projectile aerodynamics for all Mach number regimes...ray is shown as a oressions which occur near tne ogive-cy i muci anu vj -„HH iind in ;fd"has Jlen^^pTn^ded.’The a^reemf wUh tje

  8. How Magnus Bends the Flying Ball - Experimenting and Modeling

    NASA Astrophysics Data System (ADS)

    Timková, V.; Ješková, Z.

    2017-02-01

    Students are well aware of the effect of the deflection of sports balls when they have been given a spin. A volleyball, tennis, or table tennis ball served with topspin results in an additional downward force that makes the ball difficult to catch and return. In soccer, the effect of sidespin causes the ball to curve unexpectedly sideways, resulting in a so-called banana kick that can confuse the goalkeeper. These surprising effects attract students' attention such that the motion of sports balls can be used to capture the interest of students towards the physics behind it. However, to study and analyze the motion of a real ball kicked in a playfield is not an easy task. Instead of the large-scale full-size sports ball motion, there can be designed and studied simpler experiments that can be carried out in the classroom. Moreover, digital technologies that are available at schools enable students to collect data from the experiment easily in a reasonable time. The mathematical model based on the analysis of forces acting on the ball flying in the air can be used to simulate the motion in order to understand the basic physical principles of the motion so that the best correspondence may be found.

  9. One-dimensional Magnus-type platinum double salts

    PubMed Central

    Hendon, Christopher H.; Walsh, Aron; Akiyama, Norinobu; Konno, Yosuke; Kajiwara, Takashi; Ito, Tasuku; Kitagawa, Hiroshi; Sakai, Ken

    2016-01-01

    Interest in platinum-chain complexes arose from their unusual oxidation states and physical properties. Despite their compositional diversity, isolation of crystalline chains has remained challenging. Here we report a simple crystallization technique that yields a series of dimer-based 1D platinum chains. The colour of the Pt2+ compounds can be switched between yellow, orange and blue. Spontaneous oxidation in air is used to form black Pt2.33+ needles. The loss of one electron per double salt results in a metallic state, as supported by quantum chemical calculations, and displays conductivity of 11 S cm−1 at room temperature. This behaviour may open up a new avenue for controllable platinum chemistry. PMID:27320502

  10. How Magnus Bends the Flying Ball--Experimenting and Modeling

    ERIC Educational Resources Information Center

    Timková, V.; Ješková, Z.

    2017-01-01

    Students are well aware of the effect of the deflection of sports balls when they have been given a spin. A volleyball, tennis, or table tennis ball served with topspin results in an additional downward force that makes the ball difficult to catch and return. In soccer, the effect of sidespin causes the ball to curve unexpectedly sideways,…

  11. CFD Prediction of Magnus Effect in Subsonic to Supersonic Flight

    DTIC Science & Technology

    2009-09-01

    were also studied here, 3.250, 4.036, and 4.818 cal. from the nose. The geometry and unstructured mesh were generated using GAMBIT , a geometry and...grid preprocessor supplied with the FLUENT CFD software suite (16). A full, three-dimensional (3-D) mesh was required to simulate the spinning shell...computational domain was meshed with hexagons generated by revolving the paved quads around the axis (this is a Cooper mesh in GAMBIT ). The mesh for the

  12. [The Tractatus de austuribus and its adoption by Albertus Magnus].

    PubMed

    Giese, Martina

    2009-01-01

    Probably in the 60s of the 13th century Albert the Great (dagger 1280) terminated his De animalibus libri XXVI, mainly a commentary on Aristotle's Animals but a milestone in medieval zoology. In the extensive chapter De falconibus of the 23rd book, which was written around 1250 and is probably the oldest part of the whole treatise, Albert used medieval tracts on birds of prey as source material. In the article one of these tracts, the anonymous Tractatus de austuribus on the healing of hawks, is analysed and for the first time presented in a critical synoptic edition (after the Codex unicus Bethesda [MD, USA], National Library of Medicine, 73, fol. 1ra-8ra) together with the insert in Albert's De animalibus and the modern German translation of Johann Erhard Pacius (1715-1796). Pacius' German translation of De falconibus was printed as an appendix together with his translation of Frederick's II famous De arte venandi cum avibus in the year 1756. It was partly based on the German translation of book 22-26 of De animalibus published by Walther Ryff in Frankfurt/M. in 1545.

  13. Magnus: A New Resistive MHD Code with Heat Flow Terms

    NASA Astrophysics Data System (ADS)

    Navarro, Anamaría; Lora-Clavijo, F. D.; González, Guillermo A.

    2017-07-01

    We present a new magnetohydrodynamic (MHD) code for the simulation of wave propagation in the solar atmosphere, under the effects of electrical resistivity—but not dominant—and heat transference in a uniform 3D grid. The code is based on the finite-volume method combined with the HLLE and HLLC approximate Riemann solvers, which use different slope limiters like MINMOD, MC, and WENO5. In order to control the growth of the divergence of the magnetic field, due to numerical errors, we apply the Flux Constrained Transport method, which is described in detail to understand how the resistive terms are included in the algorithm. In our results, it is verified that this method preserves the divergence of the magnetic fields within the machine round-off error (˜ 1× {10}-12). For the validation of the accuracy and efficiency of the schemes implemented in the code, we present some numerical tests in 1D and 2D for the ideal MHD. Later, we show one test for the resistivity in a magnetic reconnection process and one for the thermal conduction, where the temperature is advected by the magnetic field lines. Moreover, we display two numerical problems associated with the MHD wave propagation. The first one corresponds to a 3D evolution of a vertical velocity pulse at the photosphere-transition-corona region, while the second one consists of a 2D simulation of a transverse velocity pulse in a coronal loop.

  14. Improved Magnus` form approximation of saturation vapor pressure

    SciTech Connect

    Alduchov, O.A.; Eskridge, R.E.

    1997-11-01

    Relative humidity is usually measured in aerological observations and dew point depression is usually reported in upper-air reports. These variables must frequently be converted to other moisture variables in meteorological analysis. If relative humidity is converted to vapor pressure, most humidity variables can then be determined. Elliott and Gaffen reviewed the practices and procedures of the US radiosonde system. In their paper, a comparison of the relative errors was made between the saturation vapor pressure formulations of Tetens (1930), Goff-Gratch (1946), Wexler (1976), and Buck (1981). In this paper, the authors will expand the analysis of Elliott and Gaffen by deriving several new saturation vapor pressure formulas, and reviewing the various errors in these formulations. They will show that two of the new formulations of vapor pressure over water and ice are superior to existing formulas. Upper air temperature data are found to vary from about +50 C to {minus}80 C. This large variation requires a saturation vapor pressure equation to be accurate over a large temperature range. While the errors introduced by the use of relatively inaccurate conversion equations are smaller than the errors due to the instruments, dewpoint coding errors, and dewpoint conversion algorithms (Elliott and Gaffen, 1993); they introduce additional systematic errors in humidity data. The most precise formulation of vapor pressure over a plane surface of water was given by Wexler (1976). The relative errors of Tetens` (1930) formula and one due to Buck (1981) (Buck`s equation is recommended in the Federal Meteorological Handbook No. 3, 1991) are shown. The relative errors in this table are the predicted value minus the Wexler value divided by the Wexler value.

  15. 75 FR 74128 - Manual on Uniform Traffic Control Devices (MUTCD) Compliance Dates

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-30

    ... INFORMATION CONTACT: For questions about the program discussed herein, contact Mr. Hari Kalla, MUTCD Team Leader, FHWA Office of Operations, (202) 366-5915, or via e-mail at hari.kalla@dot.gov . For...

  16. A case of Finegoldia magna (formerly Peptostreptococcus magnus) infection mimicking disseminated malignancy.

    PubMed

    Basu, Pallavi; Williams, Anwen; O'Brien, Matthew T; Brouns, Mattheus; Edwards, Paul

    2016-12-01

    A 44-year-old alcoholic (and therefore immunocompromised) hospital cleaner presented with general malaise, weight loss, and erythematous skin nodules. Computed tomography scanning revealed a neck mass invading the thyroid gland, pulmonary infiltrates, liver lesions, and deposits on the anterior abdominal wall, consistent with disseminated malignancy. However, tissue diagnosis showed a necro-inflammatory process with no evidence of malignancy. Microscopy and culture of samples failed to detect any infectious pathogen, but after an extended incubation period, Finegoldia magna was isolated. This case study illustrates the importance of tissue diagnosis in suspected disseminated malignancy and raises the risk of acquiring the rarer bacteria amongst hospital staff. Copyright © 2016. Published by Elsevier Ltd.

  17. Manos Hadjidakis: The Story of an Anarchic Youth and a "Magnus Eroticus"

    ERIC Educational Resources Information Center

    Miralis, Yiannis

    2004-01-01

    The name of Manos Hadjidakis is probably unknown to contemporary musicians and music educators. After all, the Greek composer achieved his international fame back in 1961 when he won an Oscar for his soundtrack of the movie, "Never on Sunday." Numerous other awards followed from England, Krance, Germany, and of course, Greece. After his…

  18. Albertus, "Magnus" or Magus? Magic, natural philosophy, and religious reform in the late middle ages.

    PubMed

    Collins, David J

    2010-01-01

    This article analyzes the fifteenth-century attempt by the Dominican order, especially in Cologne, to win canonization for the thirteenth-century natural philosopher Albert the Great. It shows how Albert's thought on natural philosophy and magic was understood and variously applied, how the Dominicans at Cologne composed his vitae, and how the order's Observant movement participated in these developments. It situates the canonization attempt at the intersection of two significant trends in which the order was a leading participant: first, the late medieval efforts to reform Christian society beginning with the religious life of monks and mendicants; second, the increasing concerns about the practice of learned and demonic mafic that laid groundwork for the witch-hunting of the early modern period. This article aims to shed light on intersections of science and religion -- their apprehension and negotiation -- at a decisive moment in European history for both fields of human endeavor.

  19. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41537 (9 Aug. 2007) --- Astronaut Douglas H. Wheelock, STS-120 mission specialist, uses virtual reality hardware in the Space Vehicle Mockup Facility at Johnson Space Center to rehearse some of his duties on the upcoming mission to the International Space Station. This type of virtual reality training allows the astronauts to wear special gloves and other gear while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working.

  20. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41535 (9 Aug. 2007) --- Astronaut Douglas H. Wheelock, STS-120 mission specialist, uses virtual reality hardware in the Space Vehicle Mockup Facility at Johnson Space Center to rehearse some of his duties on the upcoming mission to the International Space Station. This type of virtual reality training allows the astronauts to wear special gloves and other gear while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working.

  1. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41534 (9 Aug. 2007) --- Astronaut Scott E. Parazynski, STS-120 mission specialist, prepares to use virtual reality hardware in the Space Vehicle Mockup Facility at Johnson Space Center to rehearse some of his duties on the upcoming mission to the International Space Station. This type of virtual reality training allows the astronauts to wear special gloves and other gear while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working. David J. Homan assisted Parazynski.

  2. Magnus Effect: An Overview of Its Past and Future Practical Applications. Volumes 1 and 2

    DTIC Science & Technology

    1986-01-01

    Atlantic by way of the Azores encountering terrific storms in the Bay of Biscay and off Cape Hatteras. The * rotor sails actually proved to enhance the...34. the fluid flow. As the shafts pass this transverse porn . 290/55 tion, a torque is developed by the rotating cylinder that (56] eeea ie rotates the

  3. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41541 (9 Aug. 2007) --- Astronauts Stephanie Wilson, STS-120 mission specialist, and Dan Tani, Expedition 16 flight engineer, use the virtual reality lab at Johnson Space Center to train for their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  4. A Wind Tunnel Study of Magnus Effects on a Differentially Rotating Missile

    DTIC Science & Technology

    1992-12-01

    but I have learned more in completing this project than in all the classes combined. I would like to thank my advisor, Dr. Paul King for suggesting...00 -V O ~ In CM (7) .~j-I W 40 O~ -0 .- 3. co0 CON COCOýP 0 .0 ) W- 0 CD VC N400 T VrODVjr 0 N(0N O0 i(0( )O0 0 D 0 l)COOQ- r, 10 M r M to to C) (0

  5. Response to Yiannis Miralis, "Manos Hadjidakis: The Story of an Anarchic Youth and a "Magnus Eroticus""

    ERIC Educational Resources Information Center

    Helfer, Jason

    2004-01-01

    There are two issues that struck the author, Jason Helfer, as essential from his consideration of Miralis' paper and the ideas of Manos Hadjidakis: Eros as a pedagogical idea and learner interactions in the music classroom. These ideas developed from his interpretation of Miralis' paper, from his experiences in teacher training, and teaching in…

  6. CFD Computation of Magnus Moment and Roll Damping Moment of a Spinning Projectile

    DTIC Science & Technology

    2006-09-01

    geometry and unstructured mesh were generated using GAMBIT , a geometry and grid preprocessor supplied with the FLUENT CFD software suite.17 A full... Fluent 6.1 User’s Guide,” Vol. 2, Lebanon, NH, 2002. 18Metacomp Technologies, Inc., “CFD++ User’s Manual,” Agoura Hills, CA, 2002. NO. OF COPIES

  7. The value of life: individual preferences and social choice. A comment to Magnus Johannesson.

    PubMed

    Nord, Erik; Menzel, Paul; Richardson, Jeff

    2003-10-01

    In order to avoid undue discrimination of disabled people, we have suggested that all life years gained by the disabled should count as 1 in QALY calculations as long as the health states in question are preferred to being dead by those concerned. Johannesson noted that such a convention could lead to inconsistencies between societal and individual preferences. We believe the problem derives from the structure of preferences in the real world, rather than from our specific choice of model. The inconsistency is at any rate a much smaller practical problem than Johannesson suggests. Johannesson's alternative model has some virtues, but it does not resolve the inconsistency problem. It also leads to counter intuitive results. Copyright 2003 John Wiley & Sons, Ltd.

  8. Manos Hadjidakis: The Story of an Anarchic Youth and a "Magnus Eroticus"

    ERIC Educational Resources Information Center

    Miralis, Yiannis

    2004-01-01

    The name of Manos Hadjidakis is probably unknown to contemporary musicians and music educators. After all, the Greek composer achieved his international fame back in 1961 when he won an Oscar for his soundtrack of the movie, "Never on Sunday." Numerous other awards followed from England, Krance, Germany, and of course, Greece. After his…

  9. Estimating the magnus moment effect on stability of 30-mm boomed projectiles

    NASA Astrophysics Data System (ADS)

    Byers, R. H.; Cobb, K.

    1985-08-01

    This report documents the results obtained from a comparison of free-flight spark range tests and PRODASMAGNUS computer stability results for 30mm spin stabilized projectiles. Two configurations were considered, each with the same boom diameter of 0.5, 1.0 inch and 1.25 inch boom lengths. The results show that PRODASMAGNUS can accurately predict the effects of a boom's presence on projectile stability.

  10. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41540 (9 Aug. 2007) --- Astronauts Pamela A. Melroy, STS-120 commander, and European Space Agency's (ESA) Paolo Nespoli, mission specialist, use the virtual reality lab at Johnson Space Center to train for their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  11. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41532 (9 Aug. 2007) --- Astronaut Stephanie D. Wilson, STS-120 mission specialist, uses the virtual reality lab at Johnson Space Center to train for her duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  12. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41539 (9 Aug. 2007) --- Astronaut Pamela A. Melroy, STS-120 commander, uses the virtual reality lab at Johnson Space Center to train for her duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  13. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41531 (9 Aug. 2007) --- Astronaut Pamela A. Melroy, STS-120 commander, uses the virtual reality lab at Johnson Space Center to train for her duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  14. STS-120 crew along with Expedition crew members Dan Tani and Sandra Magnus

    NASA Image and Video Library

    2007-08-09

    JSC2007-E-41528 (9 Aug. 2007) --- Astronauts Scott E. Parazynski (seated) and European Space Agency's (ESA) Paolo Nespoli, both STS-120 mission specialists, use the virtual reality lab at Johnson Space Center to train for their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare the entire team for dealing with space station elements.

  15. Response to Yiannis Miralis, "Manos Hadjidakis: The Story of an Anarchic Youth and a "Magnus Eroticus""

    ERIC Educational Resources Information Center

    Helfer, Jason

    2004-01-01

    There are two issues that struck the author, Jason Helfer, as essential from his consideration of Miralis' paper and the ideas of Manos Hadjidakis: Eros as a pedagogical idea and learner interactions in the music classroom. These ideas developed from his interpretation of Miralis' paper, from his experiences in teacher training, and teaching in…

  16. Experimental Magnus and Static Stability Characteristics of Ballistic Projectiles with Various Boattail Angles and Lengths at Mach Numbers from 0.5 Through 2.5

    DTIC Science & Technology

    1975-08-01

    BOATTAIL ANGLES AND LENGTHS AT MACH NUMBERS FROM 0.5 THROUGH 2.5 I m m I PROPULSION WIND TUNNEL FACILITY ARNOLD ENGINEERING DEVELOPMENT CENTER AIR... Wind T u n n e l ( 4 T ) , P r o p u l s i o n Wind T u n n e l F a c i l i t y (PWT). The t e s t s w e r e p a r t o f a c o n t i n u i...with a variable stagnation pressure from 2.1 to 23.6 psia at all Mach numbers. The test section is 4 ft square and 12.5 ft long with variable ~orosity

  17. Magnus and Roll-Damping Characteristics of the Fixed-Fin and Inflatable Stabilizer Retarder Configurations of the MK-82 Store at Transonic Speeds

    DTIC Science & Technology

    1975-12-01

    model in the wind tunnel. D O -J 01 01 to Tachometer Clutch Turbiner Typical / Model Tachometer Ring Balance -Model Support Can Sting...TRANSONIC SPEEDS PROPULSION WIND TUNNEL FACILITY ARNOLD ENGINEERING DEVELOPMENT CENTER AIR FORCE SYSTEMS COMMAND ARNOLD AIR FORCE STATION...forward end of the sting. The turbine is used to spin the model to some’desired speed and then is disengaged with an air-operated sliding clutch to

  18. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003209 (18 Jan. 2011) --- NASA astronaut Ron Garan, Expedition 27/28 flight engineer, uses virtual reality hardware in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to rehearse some of his duties on the upcoming mission to the International Space Station. This type of virtual reality training allows the astronauts to wear a helmet and special gloves while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working. David Homan assisted Garan. Photo credit: NASA or National Aeronautics and Space Administration

  19. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003210 (18 Jan. 2011) --- NASA astronaut Mike Fossum, Expedition 28 flight engineer and Expedition 29 commander, uses virtual reality hardware in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to rehearse some of his duties on the upcoming mission to the International Space Station. This type of virtual reality training allows the astronauts to wear a helmet and special gloves while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working. Photo credit: NASA or National Aeronautics and Space Administration

  20. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003213 (18 Jan. 2011) --- NASA astronauts Mike Fossum (left), Expedition 28 flight engineer and Expedition 29 commander; and Ron Garan, Expedition 27/28 flight engineer, use virtual reality hardware in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to rehearse some of his duties on the upcoming mission to the International Space Station. This type of virtual reality training allows the astronauts to wear a helmet and special gloves while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working. Photo credit: NASA or National Aeronautics and Space Administration

  1. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003204 (18 Jan. 2011) --- NASA astronauts Rex Walheim, STS-135 mission specialist; and Mike Fossum (foreground), Expedition 28 flight engineer and Expedition 29 commander; use the virtual reality lab in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to train for some of their duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare crew members for dealing with space station elements. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  2. Effects of Small Nose Bluntness on Static Stability and Magnus Characteristics of a Projectile Shape at Mach 0.91 and 3.03.

    DTIC Science & Technology

    1986-07-01

    34 • - - ,-- - --’ - . - t,- . . .j, .;. ate .. J .- .. - -, - . L. ... - .L .. . . - . .. 2.. ! 4 I111IL2 1. 4 L:__ MICROCOPY RESOLUTION TESi CHART NATI(INAL PUR[AU OF...Stokes Computations are being used for transonic flowfields, including base flows. These computations can often be facilitated by the use of a sharp nose...106 at Mach 0.91 and 2.2 x 106 at Mach 3.02 based on the model length. Data for the static stability phase of the program was acquired by pitching

  3. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003207 (18 Jan. 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, uses the virtual reality lab in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to train for some of his duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare crew members for dealing with space station elements. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  4. EVA training for Exp. 27 crew member Ron Garan, Exp. 28 Mike Fossum and STS-135 Doug Hurley, Rex Walheim and Sandra Magnus

    NASA Image and Video Library

    2011-01-18

    JSC2011-E-003203 (18 Jan. 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, uses the virtual reality lab in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center to train for some of his duties aboard the space shuttle and space station. This type of computer interface, paired with virtual reality training hardware and software, helps to prepare crew members for dealing with space station elements. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  5. Pot Use Tied to Higher Odds for Stroke, Heart Failure

    MedlinePlus

    ... thoroughly with their physician before deciding whether the medical use of cannabis is safe and appropriate," Armentaro said. Study author Kalla noted that medical or recreational marijuana use is now legal in more than half ...

  6. ISS Expedition 18 Yuri Lonchakov in US Laboratory Destiny

    NASA Image and Video Library

    2008-12-01

    ISS018-E-011485 (1 Dec. 2008) --- Astronaut Sandra Magnus and cosmonaut Yury Lonchakov, both Expedition 18 flight engineers, are pictured in the Destiny laboratory of the International Space Station. A bag of fresh fruit floats freely near Magnus.

  7. Development of the Wake Behind a Circular Cylinder Impulsively Started into Rotatory and Rectilinear Motion: Intermediate Rotation Rates

    DTIC Science & Technology

    1991-01-01

    cylindre fixe ou en rotation. Effet Magnus . J. Mec. 14, 109-134. Taneda, S. 1977 Visual study of unsteady separated flows around bodies. Prog. Aero...enhancement schemes employing the Magnus effect (Swanson 1961). Rotating all or part of a body may also have applications in active or feedback control of...pressure force, consistent with previous work showing that the Magnus effect is primarily an inviscid phenomenon. 6. Conclusion Our computations of

  8. Real-Time Adaptive Control of Mixing in a Plane Shear Layer

    DTIC Science & Technology

    1994-02-02

    l’icoulement d’un fuide visqueux incompressible autour d’un cylinder fixe ou en rotation. Effet Magnus . J. Mdc. 14, 109-134. TANEDA, S. 1977 Visual study...Mokhtarian & Yokomizo 1990), and in lift enhancement schemes employing the Magnus effect (Swanson 1961). Rotation of all or part of a body may also have...investigated. It is clear that lift and drag are largely due to the pressure force, consistent with previous work showing that the Magnus effect is

  9. Ballistics Modeling for Non-Axisymmetric Hypervelocity Smart Bullets

    DTIC Science & Technology

    2014-06-03

    into a single CMq called the pitch damping coefficient. 12 3. Magnus Moment The Magnus force is seldom important in exterior ballistics, even for a...the full set of forces and moments, (b) without magnus moment, and (c) without pitch damping moment. The velocity as a function of range is given in...wheel, combined with a tabulated set of ballistic coefficients used to specify the aerodynamic forces and moments on the body. The ballistic coefficients

  10. Measurements of drag and lift on smooth balls in flight

    NASA Astrophysics Data System (ADS)

    Cross, Rod; Lindsey, Crawford

    2017-07-01

    Measurements are presented on the drag and lift coefficients for three relatively smooth balls launched in air and tracked with two cameras separated horizontally by 6.4 m. The ball spin was varied in order to investigate whether the Magnus force would increase or decrease when the ball spin was increased. For one ball, the Magnus force increased. For another ball, the Magnus force decreased almost to zero after reaching a maximum. For the third ball, the Magnus force was negative at low ball spins and positive at high ball spins. For one of the balls, the ball spin increased with time as it travelled through the air.

  11. Interaction of ultrasound with vortices in type-II superconductors

    SciTech Connect

    Sonin, E.B.

    1996-04-01

    The theory of ultrasound in the mixed state of type-II superconductors is suggested which takes into account the Magnus force on vortices, the anti-Magnus force on ions, and diamagnetism of the mixed state. The acoustic Faraday effect (rotation of polarization of the transverse ultrasonic wave propagating along vortices) is linear in the Magnus force in any regime of the flux flow for wavelengths now used in the ultrasound experiments. Therefore, in contrast to previous predictions, the Faraday effect should be looked for only in clean superconductors with a strong Magnus force. {copyright} {ital 1996 The American Physical Society.}

  12. JPRS Report, Soviet Union: Political Affairs.

    DTIC Science & Technology

    2007-11-02

    remain just that. Any attempt to change things in that Georgian people in all their inexorability, problems regard is doomed to failure. which must be...Integrated Study of the Prob- people are ever more convinced that the distance lems of Man, Boris Fedorovich LOMOV, to tell about between word and deed...months which have passed since the lying? moment of our first interview the psychology of our reader has changed drastically. People have stopped [Kallas

  13. Transverse forces on a vortex in lattice models of superfluids

    NASA Astrophysics Data System (ADS)

    Sonin, E. B.

    2013-12-01

    The paper derives the transverse forces (the Magnus and the Lorentz forces) in the lattice models of superfluids in the continuous approximation. The continuous approximation restores translational invariance absent in the original lattice model, but the theory is not Galilean invariant. As a result, calculation of the two transverse forces on the vortex, Magnus force and Lorentz force, requires the analysis of two balances, for the true momentum of particles in the lattice (Magnus force) and for the quasimomentum (Lorentz force) known from the Bloch theory of particles in the periodic potential. While the developed theory yields the same Lorentz force, which was well known before, a new general expression for the Magnus force was obtained. The theory demonstrates how a small Magnus force emerges in the Josephson-junction array if the particle-hole symmetry is broken. The continuous approximation for the Bose-Hubbard model close to the superfluid-insulator transition was developed, which was used for calculation of the Magnus force. The theory shows that there is an area in the phase diagram for the Bose-Hubbard model, where the Magnus force has an inverse sign with respect to that which is expected from the sign of velocity circulation.

  14. Boundary Layer Effects on Unsteady Airloads.

    DTIC Science & Technology

    1981-02-01

    Magnus have shown by a "viscous ramp" behind the shock, whose inclination and height can be deduced from measured shock values such that calculated shock...sat- isfactory treatment of the shock). See YanglII -6 for these specific results. " Magnus 1 1 -7 (solution of the complete, nonlinear, inviscid...34, AFFDL-TR-78-202, December 1978. 111-7 R. J. Magnus and H. Yoshihara, "Calculations of Transonic Flow Over an Oscillating Airfoil", AIAA Paper 75-98

  15. Sir Paul McCartney Wake-up Song and Greeting

    NASA Image and Video Library

    Paul McCartney and Beatles favorite "Good Day Sunshine" greet the Atlantis crew of Chris Ferguson, Doug Hurley, Sandy Magnus and Rex Walheim first thing on Flight Day 8. Sir Paul and the Beatles’...

  16. Superfluid vortex formation at rough boundaries

    SciTech Connect

    Krasnov, Y.K.

    1980-10-01

    It is shown that roughness of a superfluid boundary lowers the surface energy barrier, which prevents the detachment of quantized vortices from the boundary under the action of the Magnus force exerted by the external flow past the roughness.

  17. Investigating the Structure of Paramagnetic Aggregates from Colloidal Emulsions (InSPACE-2) Experiment in Microgravity S

    NASA Image and Video Library

    2009-01-30

    ISS018-E-024515 (30 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, works with the Microgravity Science Glovebox (MSG) in the Columbus laboratory of the International Space Station.

  18. 75 FR 33662 - Commercial Driver's License (CDL) Standards; Volvo Trucks North America, Inc.'s Exemption...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-14

    ... the requisite CDL issued by one of the States. Magnus Ericsson and Conny Harlin are part of a team of... of the exemption would be inconsistent with the goals and objectives of 49 U.S.C. 31315 and...

  19. ISS Expedition 18 Seasonal Christmas Orlan Suits

    NASA Image and Video Library

    2008-12-23

    ISS018-E-014692 (23 Dec. 2008) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, floats between two Russian Orlan spacesuits with Santa hats in the Harmony node of the International Space Station.

  20. ISS Expedition 18 Christmas Dinner Prep

    NASA Image and Video Library

    2008-12-25

    ISS018-E-015394 (25 Dec. 2008) --- Astronauts Michael Fincke, Expedition 18 commander, and Sandra Magnus, flight engineer, hold Christmas cookies while posing for a photo near the galley in the Zvezda Service Module of the International Space Station.

  1. ISS Expedition 18 Seasonal Christmas Orlan Suits

    NASA Image and Video Library

    2008-12-23

    ISS018-E-014691 (23 Dec. 2008) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, floats between two Russian Orlan spacesuits with Santa hats in the Harmony node of the International Space Station.

  2. ISS Expedition 18 Christmas Dinner Prep

    NASA Image and Video Library

    2008-12-25

    ISS018-E-015340 (25 Dec. 2008) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, prepares to eat a Christmas meal at the galley in the Zvezda Service Module of the International Space Station.

  3. ISS Expedition 18 Yuri Lonchakov in US Laboratory Destiny

    NASA Image and Video Library

    2008-12-01

    ISS018-E-011486 (1 Dec. 2008) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, is pictured near a bag of fresh fruit floating freely in the Destiny laboratory of the International Space Station.

  4. STS-135 Press Conference

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060415 (30 June 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, responds to a question from a reporter during a preflight press conference at NASA's Johnson Space Center. Photo credit: NASA

  5. STS-135 Press Conference

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060445 (30 June 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, responds to a question from a reporter during a preflight press conference at NASA's Johnson Space Center. Photo credit: NASA

  6. ISS Expedition 18 Food Preparation in Service Module (SM)

    NASA Image and Video Library

    2009-02-01

    ISS018-E-025520 (1 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, uses a communication system while preparing to eat a meal at the galley in the Zvezda Service Module of the International Space Station.

  7. STS_135_NLB

    NASA Image and Video Library

    2011-03-22

    NASA astronaut Sandy Magnus waves as she is lowered into the water to train for spacewalk in the Neutral Buoyancy Laboratory (NBL) on Tuesday, March 22, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool )

  8. ISS Expedition 18 Yuri Lonchakov in US Laboratory Destiny

    NASA Image and Video Library

    2008-12-01

    ISS018-E-011487 (1 Dec. 2008) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, is pictured near a bag of fresh onions floating freely in the Destiny laboratory of the International Space Station.

  9. A Summary of Aquatic Vegetation Monitoring at Selected Locations in Pools 4, 8, 13, and 26 and La Grange Pool of the Upper Mississippi River System. 1993 Annual Status Report,

    DTIC Science & Technology

    1998-07-01

    Najas guadalupensis (Spreng.) Magnus Nymphaeaceae American lotus Nelumbo lutea (Willd.) Pers. Nymphaeaceae White waterlily Nymphaea odorata Ait... Nymphaeaceae Yellow pondlily Nuphar lutea (L.) Sm Onagraceae Floating primrosewillow Jussiaea repens L. Pontederiaceae Water stargrass, Heteranthera dubia

  10. Final Shuttle Crew Recaps Mission for Dryden Staff

    NASA Image and Video Library

    STS-135 crew members, commander Chris Ferguson, pilot Doug Hurley and mission specialists Sandy Magnus and Rex Walheim, recalled personal highlights of the final shuttle mission and their involveme...

  11. LOH- RadGene experiment at Cell Biology Experiment Facility (CBEF)

    NASA Image and Video Library

    2009-02-20

    ISS018-E-034090 (20 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, uses a communication system near the Cell Biology Experiment Facility (CBEF) in the Kibo laboratory of the International Space Station.

  12. On the non-linear vibrations of a projectile

    NASA Astrophysics Data System (ADS)

    Rath, P. C.; Sharma, S. M.

    1981-08-01

    The Nonlinear Magnus effect on the nutational oscillations of a missile has been studied. In particular the existence of self-sustained vibrations has been proved. A numerical method is suggested to obtain the limit cycles wherever they exist.

  13. ISS Expedition 18 Food Prep in Service Module (SM)

    NASA Image and Video Library

    2009-01-01

    ISS018-E-017005 (1 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, poses for a photo with food which she prepared at the galley in the Zvezda Service Module of the International Space Station.

  14. An analytical treatment for three neutrino oscillations in the Earth

    NASA Astrophysics Data System (ADS)

    Aguilar-Arevalo, A. A.; D'Olivo, J. C.; Supanitsky, A. D.

    2012-08-01

    A simple, and at the same time accurate, description of the Earth matter effects on the oscillations between three neutrino flavors is given in terms of the Magnus expansion for the evolution operator.

  15. Stennis Space Center Wakes STS-135 Crew

    NASA Image and Video Library

    The Flight Day 10 wakeup music was “Celebration” by Kool and the Gang, which was played for Mission Specialist Sandy Magnus. The song was accompanied by a special good morning message recorded ...

  16. STS-135 Crew during prep and insertion into Fixed Base Simulator

    NASA Image and Video Library

    2011-03-03

    JSC2011-E-023112 (2 March 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, dons a training version of her shuttle launch and entry suit in preparation for a training session in the fixed-base shuttle mission simulator (SMS) in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Suit technician Toni Cost-Davis assisted Magnus. Photo credit: NASA or National Aeronautics and Space Administration

  17. STS-112 Preflight Emergency Egress Training

    NASA Image and Video Library

    2002-04-24

    JSC2002-00878 (24 April 2002) --- Astronaut Sandra H. Magnus, STS-112 mission specialist, is briefed by United Space Alliance (USA) crew trainer Bob Behrendsen on the usage of the Sky-genie, used to lower oneself from a troubled shuttle. The briefing came during a training session in the Space Vehicle Mockup Facility at the Johnson Space Center (JSC). Magnus is wearing a training version of the shuttle launch and entry suit.

  18. Coiled tubing solves multiple downhole problems

    SciTech Connect

    Bedford, S. ); Smith, I. )

    1994-11-01

    Declining reservoir pressure and water breakthrough in the UK North Sea Magnus field has coincided with general advances in application of coiled tubing and a continuous drive to reduce operating costs, particularly in a climate of weak oil prices. These factors have led to a dramatic increase in diversity and volume of coiled tubing interventions. In the following article, coiled tubing interventions, and results of those interventions, are discussed. An assessment of future coiled tubing activity on Magnus field is provided.

  19. Effect of polarization on the trajectory of dissipative solitons

    NASA Astrophysics Data System (ADS)

    Sadykov, N. R.

    2009-01-01

    We show that the optical Magnus effect for dissipative solitons is determined not only by the helicity but also by the topological index, i.e., by the magnetic quantum number or by the projection of the soliton orbital moment on its trajectory. In the case of inhomogeneous media, we find a relation between the optical Magnus effect and the nonholonomy of the field of unit vectors tangent to the trajectory.

  20. Spin-Orbit Interaction of a Photon in AN Inhomogeneous Medium

    NASA Astrophysics Data System (ADS)

    Liberman, V. S.; Zel'Dovich, B. Ya.

    The following sections are included: * Introduction * Transverse Shift of the Circularly Polarized Beam (CPB) due to Refraction * Differential Equations for a Trajectory and Polarization of the Ray. Hamilton's Form of the Equations * Optical Magnus Effect in a Graded-Index Waveguide * Optical Ping-Pong Effect in a Step-Like Index Waveguide * Paraxial Approximation for Maxwell's Equations * Spin-Orbit Corrections to the Paraxial Approximation: Hermitian Interaction Hamiltonian * The Wave Description of the Optical Magnus Effect * Conclusion * Acknowledgement * References

  1. Photographic coverage of STS-112 during EVA 3 in VR Lab.

    NASA Image and Video Library

    2002-08-21

    JSC2002-E-34625 (21 Aug. 2002) --- Astronaut Sandra H. Magnus (left), STS-112 mission specialist, uses the virtual reality lab at NASA?s Johnson Space Center (JSC) to train for her duties aboard the space shuttle Atlantis. This type of computer interface paired with virtual reality training hardware and software helps to prepare the entire team for dealing with ISS elements. Lead SSRMS instructor Elizabeth C. Bloomer assisted Magnus. Astronaut Ellen Ochoa (standing) looks on. Photo credit: NASA

  2. Simulation of aeolian sand saltation with rotational motion

    NASA Astrophysics Data System (ADS)

    Huang, Ning; Wang, Cong; Pan, Xiying

    2010-11-01

    In this work, we propose a theoretical model based on the distribution functions of initial liftoff velocity and angular velocity of sand grains to describe a sand saltation process in which both wind field-sand grain coupling and the Magnus force experienced by saltating sand grains have been incorporated. The computation results showed that the Magnus force had significant effects on sand grain saltation. In particular, when the Magnus force was incorporated, the calculated sand transport fluxes and sand transport rate per unit width were closer to the experimental value than when this force was excluded. The sand transport flux is enhanced because the Magnus force owing to particle rotation causes the particles to have higher and longer trajectories, so the particles can get more speed and energy from the wind, which leads to a larger sand transport flux. In addition, it was found that when taking the Magnus force into account, the probability density of the impact velocity and angular velocity of saltating sand grains followed an exponential distribution and a unimodal asymmetric distribution, respectively. Moreover, the sand energy flux increased with the height above the sand surface until the energy flux reached its maximum and then decreased. Furthermore, the energy flux near the ground surface decreased as the grain diameter increased, but beyond a specific height the energy flux increased with the grain diameter. Finally, for the same sand grain diameter, the energy flux increased with the friction velocity.

  3. Vortices in superconducting films: Statistics and fractional quantum Hall effect

    SciTech Connect

    Dziarmaga, J.

    1996-03-01

    We present a derivation of the Berry phase picked up during exchange of parallel vortices. This derivation is based on the Bogolubov{endash}de Gennes formalism. The origin of the Magnus force is also critically reanalyzed. The Magnus force can be interpreted as an interaction with the effective magnetic field. The effective magnetic field may be even of the order 10{sup 6}{ital T}/A. We discuss a possibility of the fractional quantum Hall effect (FQHE) in vortex systems. As the real magnetic field is varied to drive changes in vortex density, the vortex density will prefer to stay at some quantized values. The mere existence of the FQHE does not depend on vortex quantum statistics, although the pattern of the plateaux does. We also discuss how the density of anyonic vortices can lower the effective strengh of the Magnus force, what might be observable in measurements of Hall resistivity. {copyright} {ital 1996 The American Physical Society.}

  4. Efficient methods for linear Schrödinger equation in the semiclassical regime with time-dependent potential

    NASA Astrophysics Data System (ADS)

    Bader, Philipp; Iserles, Arieh; Kropielnicka, Karolina; Singh, Pranav

    2016-09-01

    We build efficient and unitary (hence stable) methods for the solution of the linear time-dependent Schrödinger equation with explicitly time-dependent potentials in a semiclassical regime. The Magnus-Zassenhaus schemes presented here are based on a combination of the Zassenhaus decomposition (Bader et al. 2014 Found. Comput. Math. 14, 689-720. (doi:10.1007/s10208-013-9182-8)) with the Magnus expansion of the time-dependent Hamiltonian. We conclude with numerical experiments.

  5. Experimental Measurements of the Turbulent Boundary Layer on a Yawed, Spinning Slender Body

    DTIC Science & Technology

    1977-01-01

    oncepts using a least s uare fittin technigue The effet * gind DD0 FJT" 1473 EDITIONMOF I 06VOIIItoSOLEIR JA I IN.. S.ITI 11E LOT, CLAIPICA~tOW or ?HO...gaining further knowledge of the Magnus effect in particular. Reference I presents some experimental evidence showing the significant effect that the...boundary layer configuration has on the agnus force experienced by a yawed, spinning body of revolution as well as a discussion of the influence of Magnus

  6. Hypersonic Laminar Viscous Flow Past Spinning Cones at Angle of Attack

    NASA Technical Reports Server (NTRS)

    Agarwal, Ramesh; Rakich, John V.

    1982-01-01

    Computational results are presented for hypersonic viscous flow past spinning sharp and blunt cones of angle of attack, obtained with a parabolic Navier-Stokes marching code. The code takes into account the asymmetries in the flowfield resulting from spinning motion and computes the asymmetric shock shape, cross-flow and streamwise shear, heat transfer, cross-flow separation, and vortex structure. The Magnus force and moments are also computed. Comparisons are made with other theoretical analyses based on boundary-layer and boundary-region equations, and an anomaly is discovered in the displacement thickness contribution to the Magnus force when compared with boundary-layer results.

  7. Viscous flow over spinning cones at angle of attack.

    NASA Technical Reports Server (NTRS)

    Lin, T. C.; Rubin, S. G.

    1973-01-01

    A numerical finite-difference method is developed for evaluating the Magnus coefficients on spinning cones in laminar flow. The merged layer, the strong interaction region, and the downstream boundary layer are all considered. The numerical method is a predictor-corrector scheme developed for three-dimensional flows with or without crossflow diffusion. This method is particularly useful in problems in which a symmetry plane does not exist. Several contributions to the Magnus force and moments are considered. These include asymmetries in displacement thickness, centrifugal force and crossflow shear, and the effects of crossflow separation and vortex formation. Comparisons are made with experimental data and other analyses.

  8. Phase-sensitive measurements of vortex dynamics in the terahertz domain

    SciTech Connect

    Parks, B.; Spielman, S.; Orenstein, J.; Nemeth, D.T.; Ludwig, F.; Clarke, J.; Merchant, P.; Lew, D.J. ||

    1995-04-17

    Phase-sensitive spectroscopy is used to characterize fully the complex resistivity tensor of YBa{sub 2}Cu{sub 3}O{sub {ital x}} films in the mixed state, in the frequency range 100 to 500 GHz and temperature range 10 K to {ital T}{sub {ital c}}. We compare our results with the predictions of a vortex model containing three parameters: viscosity, pinning, and Magnus force. The viscosity and Magnus parameter we measure are in disagreement with theoretically predicted values. We show that the discrepancies can be explained by incorporating the effects of a highly anisotropic or {ital d}-wave gap.

  9. Numerical simulation of steady supersonic flow over spinning bodies of revolution

    NASA Technical Reports Server (NTRS)

    Sturek, W. B.; Schiff, L. B.

    1982-01-01

    A recently reported parabolized Navier-Stokes code has been employed to compute the supersonic flowfield about a spinning cone and spinning and nonspinning ogive cylinder and boattailed bodies of revolution at moderate incidence. The computations were performed for flow conditions where extensive measurements for wall pressure, boundary-layer velocity profiles, and Magnus force had been obtained. Comparisons between the computational results and experiment indicate excellent agreement for angles of attack up to 6 deg. At angles greater than 6 deg discrepancies are noted which are tentatively attributed to turbulence modeling errors. The comparisons for Magnus effects show that the code accurately predicts the effects of body shape for the selected models.

  10. A new species of sesarmid crab of the genus Chiromantes (Crustacea: Decapoda: Brachyura) from the Ogasawara Islands, Japan.

    PubMed

    Komai, Tomoyuki; Ng, Peter K L

    2013-01-01

    A new species of sesarmid crab, Chiromantes magnus, is described from the Ogasawara (Bonin) Is., Japan. The new species was previously confused with C. dehaani (H. Milne Edwards, 1853). The different carapace shape, proportionally longer ambulatory legs, large adult size and the distinct live coloration distinguish the new species from its two closest congeners, C. dehaani and C. neglectus (De Man, 1887). Available information indicates that C. magnus n. sp. is endemic to the Ogasawara Is.; there is no evidence of the occurrence of the true C. dehaani in the Ogasawara Is.

  11. Effects of Base Cavity Depth on a Free Spinning Wrap-Around Fin Missile Configuration

    DTIC Science & Technology

    1995-12-01

    cases . One study which claimed advantageous force changes due to base cavities was the STRIX report (18). During the late 1980’s, Swedish Ordnance and...rotation, as seen from the rear, and the spin rate has no effect on this Magnus moment. In many cases this particular Magnus moment is much larger than the...and the sting/model aligned in the tunnel to read a near zero yaw moment. A zero reading was recorded, followed by a test run for the non- spinning case

  12. STS-112 Post Flight Presentation

    NASA Technical Reports Server (NTRS)

    2002-01-01

    The STS-112 post flight presentation begins with a shot of the moonrise over the Earth's Limb. A photograph of the STS-112 crew is shown. The crew consists of Mission Specialists Sandy Magnus, David Wolf, Piers Sellers and Fodor Yurchikhin, Pilot Pam Melroy and Commander Jeff Ashby. The crew departs from the Operations and Control Building to the launch pad at Kennedy Space Center in Florida. Sandy Magnus is shown preparing to board the Space Shuttle Atlantis. The actual STS-112 launch with flight deck activity during rendezvous with the International Space Station is also presented.

  13. STS-112 Flight Day 8 Highlights

    NASA Technical Reports Server (NTRS)

    2002-01-01

    On this eighth day of the STS-112 mission, the crew members of Atlantis (Commander Jeff Ashby; Pilot Pam Melroy; Mission Specialists Sandy Magnus, Piers Sellers, Dave Wolf, and Fyodor Yurchikhin) are seen preparing for the mission's third extravehicular activity (EVA). Magnus is shown reviewing instructions for operation of the International Space Station's (ISS) robot arm. Wolf and Sellers are seen successfully attaching cable connections to the S1 truss during the EVA. Scenes shown include: the ISS's robot arm, the Crew Equipment Translation Aid (CETA) cart and the deployment of the central radiator panel of the S1 truss.

  14. Interaction of vortex lattice with ultrasound and the acoustic Faraday effect

    SciTech Connect

    Dominguez, D.; Bulaevskii, L.; Ivlev, B.; Maley, M.; Bishop, A.R. |

    1995-03-27

    The interaction of sound with the vortex lattice is considered for high-{ital T}{sub {ital c}} superconductors, taking into account pinning and electrodynamic forces between vortices and crystal displacements. At low temperatures the Magnus force results in the acoustic Faraday effect; the velocity of sound propagating along the magnetic field depends on the polarization. This effect is linear in the Magnus force and magnetic field in crystals with equivalent {ital a} and {ital b} axes for a field parallel to the {ital c} axis. In the thermally activated flux flow regime, the Faraday effect is caused by electric and magnetic fields induced by vortices and acting on ions.

  15. Viscous flow over spinning cones at angle of attack.

    NASA Technical Reports Server (NTRS)

    Lin, T. C.; Rubin, S. G.

    1973-01-01

    A numerical finite-difference method is developed for evaluating the Magnus coefficients on spinning cones in laminar flow. The merged layer, the strong interaction region, and the downstream boundary layer are all considered. The numerical method is a predictor-corrector scheme developed for three-dimensional flows with or without crossflow diffusion. This method is particularly useful in problems in which a symmetry plane does not exist. Several contributions to the Magnus force and moments are considered. These include asymmetries in displacement thickness, centrifugal force and crossflow shear, and the effects of crossflow separation and vortex formation. Comparisons are made with experimental data and other analyses.

  16. Hypersonic Laminar Viscous Flow Past Spinning Cones at Angle of Attack

    NASA Technical Reports Server (NTRS)

    Agarwal, Ramesh; Rakich, John V.

    1982-01-01

    Computational results are presented for hypersonic viscous flow past spinning sharp and blunt cones of angle of attack, obtained with a parabolic Navier-Stokes marching code. The code takes into account the asymmetries in the flowfield resulting from spinning motion and computes the asymmetric shock shape, cross-flow and streamwise shear, heat transfer, cross-flow separation, and vortex structure. The Magnus force and moments are also computed. Comparisons are made with other theoretical analyses based on boundary-layer and boundary-region equations, and an anomaly is discovered in the displacement thickness contribution to the Magnus force when compared with boundary-layer results.

  17. Numerical simulation of steady supersonic flow over spinning bodies of revolution

    NASA Technical Reports Server (NTRS)

    Sturek, W. B.; Schiff, L. B.

    1982-01-01

    A recently reported parabolized Navier-Stokes code has been employed to compute the supersonic flowfield about a spinning cone and spinning and nonspinning ogive cylinder and boattailed bodies of revolution at moderate incidence. The computations were performed for flow conditions where extensive measurements for wall pressure, boundary-layer velocity profiles, and Magnus force had been obtained. Comparisons between the computational results and experiment indicate excellent agreement for angles of attack up to 6 deg. At angles greater than 6 deg discrepancies are noted which are tentatively attributed to turbulence modeling errors. The comparisons for Magnus effects show that the code accurately predicts the effects of body shape for the selected models.

  18. STS-112 crew in their sleep restraints on the orbiter middeck

    NASA Image and Video Library

    2002-10-18

    STS112-345-028 (7-18 October 2002) --- The STS-112 crewmembers sleep on the middeck of the Space Shuttle Atlantis. Pictured are astronauts Sandra H. Magnus, David A. Wolf, Piers J. Sellers, mission specialists, and Jeffrey S. Ashby, mission commander.

  19. History as an Introduction to Science.

    ERIC Educational Resources Information Center

    Patterson, Elizabeth C.

    1980-01-01

    Discusses the controversy regarding the role of history of science in a liberal education, presenting two issues: What properly constitutes the subject and whether history of science has a place in the undergraduate curriculum. Describes a college course taught at Albertus Magnus College, New Haven, CT. (CS)

  20. Beckham as Physicist?

    ERIC Educational Resources Information Center

    Ireson, Gren

    2001-01-01

    If football captures the interest of students, it can be used to teach physics. In this case, a Beckham free-kick can be used to introduce concepts such as drag, the Bernoulli principle, Reynolds number, and the Magnus effect by asking the simple question: How does he curve the ball so much? Introduces basic mechanics along the way. (Author/ASK)

  1. A Participants' DSS for a Management Game with a DSS Generator.

    ERIC Educational Resources Information Center

    Yeo, Gee Kin; Nah, Fui Hoon

    1992-01-01

    Describes the design of a decision support system (DSS) for a management game called MAGNUS (Management Game for National University of Singapore). Built-in models for performance analysis and decision making are explained; database query and model building are described; and future work is discussed. (11 references) (LRW)

  2. Post-Lie Algebras and Isospectral Flows

    NASA Astrophysics Data System (ADS)

    Ebrahimi-Fard, Kurusch; Lundervold, Alexander; Mencattini, Igor; Munthe-Kaas, Hans Z.

    2015-11-01

    In this paper we explore the Lie enveloping algebra of a post-Lie algebra derived from a classical R-matrix. An explicit exponential solution of the corresponding Lie bracket flow is presented. It is based on the solution of a post-Lie Magnus-type differential equation.

  3. Techniques Class: September 12, 2001.

    ERIC Educational Resources Information Center

    More, William; Corsetti, Patricia L.; Endleman, Orna; Julian, Sarah; Lindemann, Evie; Spinelli, Laura

    2002-01-01

    On September 12, 2001, the Techniques in Art Therapy class in the art therapy program at Albertus Magnus College met at its normal Wednesday evening time. This article describes the class session through the words and images of several class members who found the class useful in their own process of beginning to deal with the attacks and their…

  4. The Liberation Arts

    ERIC Educational Resources Information Center

    Pelikan, Jaroslav

    1973-01-01

    Text of a 1973 commencement address given at Albertus Magnus College concerning the goals of a liberal education (historical remembrance, critical reflection, moral resolve, and thoughtful reverence) that alone can truly liberate women and, through them, mankind as a whole. (Editor/PG)

  5. Squeezing the Calendar.

    ERIC Educational Resources Information Center

    Shea, Christopher

    1994-01-01

    Albertus Magnus College (Connecticut) has addressed the problem of declining enrollment offering a bachelor's degree program compressed into three years. Three full semesters are squeezed into an academic year. The semester is shortened by two weeks, but class time is lengthened. The third semester's tuition each year is discounted. (MSE)

  6. Clausius-Clapeyron Equation and Saturation Vapour Pressure: Simple Theory Reconciled with Practice

    ERIC Educational Resources Information Center

    Koutsoyiannis, Demetris

    2012-01-01

    While the Clausius-Clapeyron equation is very important as it determines the saturation vapour pressure, in practice it is replaced by empirical, typically Magnus-type, equations which are more accurate. It is shown that the reduced accuracy reflects an inconsistent assumption that the latent heat of vaporization is constant. Not only is this…

  7. Chemical, Biochemical, and Genetic Approaches to Arsenic Metabolism" -An overview of arsenic metabolism and toxicity- A series of five papers to appear together in Current Protocols in Toxicology

    EPA Science Inventory

    The toxic properties of arsenic (As) were recognized long before Albertus Magnus in the 13th century prepared its elemental form (Buchanan, 1962). Its use as a poison has played lethal and decisive roles in domestic and dynastic intrigues throughout history (Cullen, 2008). Inorga...

  8. In vivo moment arm lengths for hip extensor muscles at different angles of hip flexion.

    PubMed

    Németh, G; Ohlsén, H

    1985-01-01

    Moment arm lengths of three hip extensor muscles, the gluteus maximus, the hamstrings and the adductor magnus, were determined at hip flexion angles from 0 degrees to 90 degrees by combining data from ten autopsy specimens and from twenty patients, the latter examined by computed tomography. A straight-line muscle model for muscle force was used for the hamstrings and adductor magnus, and for the gluteus maximus a two-segment straight-line muscle force model was used. With the joint in its anatomical position the moment arm of the gluteus maximus to the bilateral motion axis averaged 79 mm, for the hamstrings 61 mm and for the adductor magnus 15 mm. The moment arm of gluteus maximus decreased with increasing hip flexion angle. The hamstrings showed an increase in moment arm length up to an average of 35 degrees hip flexion and then a decrease with increasing hip flexion angle. The corresponding figures for the adductor magnus moment arm showed an increase up to 75 degrees and then a decrease. Statistical analysis revealed significant differences in moment arm length between men and women.

  9. Noncommuting momenta of topological solitons.

    PubMed

    Watanabe, Haruki; Murayama, Hitoshi

    2014-05-16

    We show that momentum operators of a topological soliton may not commute among themselves when the soliton is associated with the second cohomology H2 of the target space. The commutation relation is proportional to the winding number, taking a constant value within each topological sector. The noncommutativity makes it impossible to specify the momentum of a topological soliton, and induces a Magnus force.

  10. Vortex pair production and decay of a two-dimensional supercurrent by a quantum-field-theory approach

    SciTech Connect

    Iengo, R. |; Jug, G. |

    1995-09-01

    We investigate the phenomenon of the decay of a supercurrent through homogeneous nucleation of vortex-antivortex pairs in a two-dimensional (2D) like superconductor or superfluid by means of a quantum electrodynamic formulation for the decay of the 2D vacuum. The case in which both externally driven current and Magnus force are present is treated exactly, taking the vortex activation energy and its inertial mass as independent parameters. Quantum dissipation is included through the formulation introduced by Caldeira and Leggett. The most relevant consequence of quantum dissipation is the elimination of the threshold for vortex production due to the Magnus force. In the dissipation-dominated case, corresponding formally to the limit of zero intertial mass, an exact formula for the pair production rate is given. If however the inertial mass is strictly zero we find that vortex production is inhibited by a quantum effect related to the Magnus force. The possibility of including vortex pinning is investigated by means of an effective harmonic potential. While an additional term in the vortex activation energy can account for the effect of a finite barrier in the direction perpendicular to the current, pinning along the current depresses the role of the Magnus force in the dissipation-dominated dynamics, except for the above-mentioned quantum effect. A possible description of vortex nucleation due to the combined effects of temperature and externally driven currents is also presented along with an evaluation of the resulting voltage drop.

  11. [Astrologic and medical manuscript of the 18th Century].

    PubMed

    Kugener, Henri

    2010-01-01

    We present a manuscript from the 18th century, an extract taken from the "Great and the Little Albert" attributed to Albertus Magnus. The linguistic variety in the paper is typical for a text composed in Luxembourg. Added to this text are two incantations and a short cartomancy paper.

  12. ISS Expedition 18 Christmas Dinner Prep

    NASA Image and Video Library

    2008-12-25

    ISS018-E-015379 (25 Dec. 2008) --- Astronauts Michael Fincke (left), Expedition 18 commander; Sandra Magnus and cosmonaut Yury Lonchakov, both flight engineers, pose for a photo as they prepare to share a Christmas meal at the galley in the Zvezda Service Module of the International Space Station.

  13. STS_135_ MEDIA

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060793 (30 June 2011) --- The crew of STS-135, from left, pilot Doug Hurley, mission specialists Rex Walheim and Sandy Magnus, and commander Chris Ferguson pose for a group photo following the crew media briefing at the Johnson Space Center in Houston on June 30, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  14. ISS Expedition 18 Japanese Experiment Module (JEM) Remote Manipulator System (RMS) Function Test 2

    NASA Image and Video Library

    2009-01-19

    ISS018-E-019933 (19 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, uses a communication system while performing a function test of the Japanese Remote Manipulator System (JEM-RMS) in the Kibo laboratory of the International Space Station.

  15. ISS Expedition 18 Japanese Experiment Module (JEM) Remote Manipulator System (RMS) Function Test 2

    NASA Image and Video Library

    2009-01-19

    ISS018-E-019920 (19 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, uses a communication system while performing a function test of the Japanese Remote Manipulator System (JEM-RMS) in the Kibo laboratory of the International Space Station.

  16. Registration of ‘Zenith' black bean

    USDA-ARS?s Scientific Manuscript database

    ‘Zenith’ black bean (Phaseolus vulgaris L.) (Reg. no. CV- , PI -), developed by Michigan State University AgBioResearch was released in 2014 as an upright, full-season cultivar with anthracnose [caused by Colletotrichum lindemuthianum (Sacc. et Magnus) Lams.-Scrib] resistance and excellent canning q...

  17. ISS Expedition 18 Lab-On-a-Chip Applications Development (LOCAD) OPS

    NASA Image and Video Library

    2009-01-10

    ISS018-E-018995 (10 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, works with the Lab-on-a-Chip Application Development-Portable Test System (LOCAD-PTS) experiment in the Destiny laboratory of the International Space Station. LOCAD-PTS is a handheld device for rapid detection of biological and chemical substances onboard the station.

  18. KSC-02pd1392

    NASA Image and Video Library

    2002-09-30

    KENNEDY SPACE CENTER, FLA. --STS-112 Mission Specialist Sandra Magnus dons her space helmet for a final fit check in preparation for her launch to the International Space Station aboard Atlantis. Launch is scheduled for Oct. 2 between 2 and 6 p.m. EDT.

  19. The Bernoulli or Coanda Conundrum and Other Classical Demonstration Myths

    NASA Astrophysics Data System (ADS)

    Stille, Dale

    2009-11-01

    Lecture Demonstration professionals have recently taken a closer look at demonstrations that were traditionally labeled ``Bernoulli Demonstrations'' in most textbooks. This examination has shown that in most cases the Coanda Effect, Magnus Effect, and Entrainment may be better explanations for most of these classic demonstrations. A discussion of other similarly classic demonstrations and some of their problems or misconceptions will also be presented.

  20. Landing Day Wake Up Song and Greeting

    NASA Image and Video Library

    Kate Smith’s rendition of Irving Berlin’s “God Bless America” woke Commander Chris Ferguson, Pilot Doug Hurley and Mission Specialists Sandy Magnus and Rex Walheim. But unlike most wakeup s...

  1. Transverse forces on vortices in superfluids in a periodic potential

    NASA Astrophysics Data System (ADS)

    Sonin, E. B.

    2016-08-01

    The paper analyzes the transverse forces (the Magnus and the Lorentz forces) on vortices in superfluids put into periodic potentials at T =0 . The case of weak potential and the tight-binding limit described by the Bose-Hubbard model were addressed. The analysis was based on the balance of true momentum and quasimomentum. A special attention was paid to the superfluid close to the superfluid-insulator transition. In this area of the phase diagram the theory predicts the particle-hole symmetry line where the Magnus force changes sign with respect to that expected from the sign of velocity circulation. Our analysis has shown that the magnitude of the Magnus force is a continuous function at crossing the particle-hole symmetry line. This challenges the theory connecting the magnitude of the Magnus force with topological Chern numbers and predicting a jump at crossing this line. Disagreement is explained by the role of intrinsic pinning and guided vortex motion ignored in the topological approach. It is one more evidence that in general topological arguments are not sufficient for derivation of equations of vortex motion.

  2. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028126 (23 March 2011) --- NASA astronauts Chris Ferguson, STS-135 commander; Doug Hurley, pilot; and Sandy Magnus, mission specialist, are pictured during an STS-135 media day event in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

  3. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028150 (23 March 2011) --- NASA astronauts Doug Hurley, STS-135 pilot; and Sandy Magnus (foreground), mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

  4. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028151 (23 March 2011) --- NASA astronauts Doug Hurley, STS-135 pilot; and Sandy Magnus (foreground), mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

  5. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028153 (23 March 2011) --- NASA astronauts Doug Hurley, STS-135 pilot; and Sandy Magnus (foreground), mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

  6. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028122 (23 March 2011) --- NASA astronauts Doug Hurley, STS-135 pilot; and Sandy Magnus (foreground), mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. Photo credit: NASA or National Aeronautics and Space Administration

  7. STS_135_MB

    NASA Image and Video Library

    2011-05-06

    The crew of STS-135, from left, Doug Hurley, Chris Ferguson, Sandy Magnus and Rex Walheim walk between buildings at the Johnson Space Center after a simulation in the motion based simulator on Friday, May 6, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool ).

  8. STS_135_NLB

    NASA Image and Video Library

    2011-03-22

    NASA astronaut Sandy Magnus is helped out of her training EMU after training for spacewalk in the Neutral Buoyancy Laboratory (NBL) on Tuesday, March 22, 2011, in Houston. In the background, a test is performed on the Orion capsule. ( NASA Photo / Houston Chronicle, Smiley N. Pool )

  9. ISS Expedition 18 Fluids and Combustion Facility (FCF) Combustion Integration Rack (CIR) Passive Rack Isolation System (

    NASA Image and Video Library

    2009-01-05

    ISS018-E-017796 (5 Jan. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, works on the Fluids and Combustion Facility (FCF) Combustion Integration Rack (CIR) Passive Rack Isolation System (PaRIS) in the Destiny laboratory of the International Space Station.

  10. Heart and Reason: A Comparison of John Dewey's "A Common Faith" and His "Religious" Poems

    ERIC Educational Resources Information Center

    Miedema, Siebren

    2010-01-01

    In this article a comparison is drawn between the way in which the pragmatist philosopher and pedagogue John Dewey addressed religious issues and his view on Religious Education in his poetic narratives and in his scholarly writings, especially in his "magnus opus" on religion, "A Common Faith". Do we gain deeper insight into Dewey's view on…

  11. Innovative Leader Development: Evaluation of the U.S. Army Asymmetric Warfare Adaptive Leader Program

    DTIC Science & Technology

    2014-01-01

    training outcomes in AWALP, such as Big Five personality traits , general cognitive ability, learning goal orientation, and various demographic...general cognitive ability and personality traits , including achieve- ment orientation and openness to experience),2 although experience in only...and Ford, 1998; Klein, Noe and Wang, 2006; Mesmer-Magnus and Viswesvaran, 2007; Phillips and Gully, 1997); and personality traits , such as

  12. Wernher von Braun

    NASA Image and Video Library

    1945-04-01

    Dr. Wernher von Braun surrenders to U.S. Army Counterintelligence persornel of the 44th Infantry Division in Ruette, Bavaria on May 2, 1945. Left to right are Charles Stewart, CIC agent; Dr. Herbert Axster; Dieter Huzel; Dr. von Braun (arm in cast); Magnus von Braun (brother); and Hans Lindenberg.

  13. Clausius-Clapeyron Equation and Saturation Vapour Pressure: Simple Theory Reconciled with Practice

    ERIC Educational Resources Information Center

    Koutsoyiannis, Demetris

    2012-01-01

    While the Clausius-Clapeyron equation is very important as it determines the saturation vapour pressure, in practice it is replaced by empirical, typically Magnus-type, equations which are more accurate. It is shown that the reduced accuracy reflects an inconsistent assumption that the latent heat of vaporization is constant. Not only is this…

  14. Chemical, Biochemical, and Genetic Approaches to Arsenic Metabolism" -An overview of arsenic metabolism and toxicity- A series of five papers to appear together in Current Protocols in Toxicology

    EPA Science Inventory

    The toxic properties of arsenic (As) were recognized long before Albertus Magnus in the 13th century prepared its elemental form (Buchanan, 1962). Its use as a poison has played lethal and decisive roles in domestic and dynastic intrigues throughout history (Cullen, 2008). Inorga...

  15. An Analytic Model for DoD Investment & Divestment Decisions (Briefing Charts)

    DTIC Science & Technology

    2015-05-01

    Acquisition and Divestment Decision Making,” Academy of Management Review, 1985, Vol, 10, No. 2, 287-295; **Michael C. Mankins, David Harding, and Rolf ...Corporation. ALL RIGHTS RESERVED. Rules of Thumb: Private Sector Remedies 1 1. Michael C. Mankins, David Harding, and Rolf -Magnus Weddigen, “How the Best

  16. Vortex pair production and decay of a two-dimensional supercurrent by a quantum-field-theory approach

    NASA Astrophysics Data System (ADS)

    Iengo, Roberto; Jug, Giancarlo

    1995-09-01

    We investigate the phenomenon of the decay of a supercurrent through homogeneous nucleation of vortex-antivortex pairs in a two-dimensional (2D) like superconductor or superfluid by means of a quantum electrodynamic formulation for the decay of the 2D vacuum. The case in which both externally driven current and Magnus force are present is treated exactly, taking the vortex activation energy and its inertial mass as independent parameters. Quantum dissipation is included through the formulation introduced by Caldeira and Leggett. The most relevant consequence of quantum dissipation is the elimination of the threshold for vortex production due to the Magnus force. In the dissipation-dominated case, corresponding formally to the limit of zero intertial mass, an exact formula for the pair production rate is given. If however the inertial mass is strictly zero we find that vortex production is inhibited by a quantum effect related to the Magnus force. The possibility of including vortex pinning is investigated by means of an effective harmonic potential. While an additional term in the vortex activation energy can account for the effect of a finite barrier in the direction perpendicular to the current, pinning along the current depresses the role of the Magnus force in the dissipation-dominated dynamics, except for the above-mentioned quantum effect. A possible description of vortex nucleation due to the combined effects of temperature and externally driven currents is also presented along with an evaluation of the resulting voltage drop.

  17. A Participants' DSS for a Management Game with a DSS Generator.

    ERIC Educational Resources Information Center

    Yeo, Gee Kin; Nah, Fui Hoon

    1992-01-01

    Describes the design of a decision support system (DSS) for a management game called MAGNUS (Management Game for National University of Singapore). Built-in models for performance analysis and decision making are explained; database query and model building are described; and future work is discussed. (11 references) (LRW)

  18. History as an Introduction to Science.

    ERIC Educational Resources Information Center

    Patterson, Elizabeth C.

    1980-01-01

    Discusses the controversy regarding the role of history of science in a liberal education, presenting two issues: What properly constitutes the subject and whether history of science has a place in the undergraduate curriculum. Describes a college course taught at Albertus Magnus College, New Haven, CT. (CS)

  19. Techniques Class: September 12, 2001.

    ERIC Educational Resources Information Center

    More, William; Corsetti, Patricia L.; Endleman, Orna; Julian, Sarah; Lindemann, Evie; Spinelli, Laura

    2002-01-01

    On September 12, 2001, the Techniques in Art Therapy class in the art therapy program at Albertus Magnus College met at its normal Wednesday evening time. This article describes the class session through the words and images of several class members who found the class useful in their own process of beginning to deal with the attacks and their…

  20. The Liberation Arts

    ERIC Educational Resources Information Center

    Pelikan, Jaroslav

    1973-01-01

    Text of a 1973 commencement address given at Albertus Magnus College concerning the goals of a liberal education (historical remembrance, critical reflection, moral resolve, and thoughtful reverence) that alone can truly liberate women and, through them, mankind as a whole. (Editor/PG)

  1. Squeezing the Calendar.

    ERIC Educational Resources Information Center

    Shea, Christopher

    1994-01-01

    Albertus Magnus College (Connecticut) has addressed the problem of declining enrollment offering a bachelor's degree program compressed into three years. Three full semesters are squeezed into an academic year. The semester is shortened by two weeks, but class time is lengthened. The third semester's tuition each year is discounted. (MSE)

  2. Heart and Reason: A Comparison of John Dewey's "A Common Faith" and His "Religious" Poems

    ERIC Educational Resources Information Center

    Miedema, Siebren

    2010-01-01

    In this article a comparison is drawn between the way in which the pragmatist philosopher and pedagogue John Dewey addressed religious issues and his view on Religious Education in his poetic narratives and in his scholarly writings, especially in his "magnus opus" on religion, "A Common Faith". Do we gain deeper insight into Dewey's view on…

  3. Photographic coverage of STS-112 during EVA 3 in VR Lab.

    NASA Image and Video Library

    2002-08-21

    JSC2002-E-34629 (21 August 2002) --- Astronaut Sandra H. Magnus, STS-112 mission specialist, uses the virtual reality lab at the Johnson Space Center (JSC) to train for her duties aboard the Space Shuttle Atlantis. This type of computer interface paired with virtual reality training hardware and software helps to prepare the entire team for dealing with ISS elements.

  4. Postoperative Mediastinitis Due to Finegoldia magna with Negative Blood Cultures▿

    PubMed Central

    Kernéis, Solen; Matta, Matta; Hoï, Annie Buu; Podglajen, Isabelle; Gutmann, Laurent; Novara, Ana; Latremouille, Christian; Mainardi, Jean-Luc

    2009-01-01

    We report a case of Finegoldia magna (formerly known as Peptostreptococcus magnus) mediastinitis following coronary artery bypass in a 50-year-old patient. Even if staphylococci remain the main causative organism of postoperative mediastinitis, the responsibility of anaerobic bacteria must be considered in cases of fever and sternal drainage with negative blood cultures. PMID:19812272

  5. Joint Replacement Aircraft: The Case for a Single Multi-Mission HMLA Platform

    DTIC Science & Technology

    1999-01-01

    David S. Capt (USMC) The UH-1N Upgrade: At a Crossroads. Marine Corps Gazette, May 1996. 44-45. 41 Magnus, Robert. BGen (Asst. DCSA, USMC...51 Jane’s Land Based Air Defence. 228 52 Alexander, David R. Capt USA. Helicopter...53 Attenborough , Keith. Coupling Between Airborne Sound and the

  6. Recent Experiments at the Gottingen Aerodynamic Institute

    NASA Technical Reports Server (NTRS)

    Ackeret, J

    1925-01-01

    This report presents the results of various experiments carried out at the Gottingen Aerodynamic Institute. These include: experiments with Joukowski wing profiles; experiments on an airplane model with a built-in motor and functioning propeller; and the rotating cylinder (Magnus Effect).

  7. Finishing High School: Alternative Pathways and Dropout Recovery

    ERIC Educational Resources Information Center

    Tyler, John H.; Lofstrom, Magnus

    2009-01-01

    John Tyler and Magnus Lofstrom take a close look at the problems posed when students do not complete high school. The authors begin by discussing the ongoing, sometimes heated, debate over how prevalent the dropout problem is. They note that one important reason for discrepancies in reported dropout rates is whether holders of the General…

  8. Noncommuting Momenta of Topological Solitons

    NASA Astrophysics Data System (ADS)

    Watanabe, Haruki; Murayama, Hitoshi

    2014-05-01

    We show that momentum operators of a topological soliton may not commute among themselves when the soliton is associated with the second cohomology H2 of the target space. The commutation relation is proportional to the winding number, taking a constant value within each topological sector. The noncommutativity makes it impossible to specify the momentum of a topological soliton, and induces a Magnus force.

  9. Beckham as Physicist?

    ERIC Educational Resources Information Center

    Ireson, Gren

    2001-01-01

    If football captures the interest of students, it can be used to teach physics. In this case, a Beckham free-kick can be used to introduce concepts such as drag, the Bernoulli principle, Reynolds number, and the Magnus effect by asking the simple question: How does he curve the ball so much? Introduces basic mechanics along the way. (Author/ASK)

  10. Nonadiabatic three-neutrino oscillations in matter

    SciTech Connect

    DOlivo, J.C.; Oteo, J.A.

    1996-07-01

    Oscillations of three neutrinos in matter are analyzed by using the Magnus expansion for the time-evolution operator. We derive a simple expression for the electron-neutrino survival probability which is applied to the examination of the effect of a third neutrino on the nonadiabatic flavor transformations. {copyright} {ital 1996 The American Physical Society.}

  11. Turbulence Modulation and Dense-Spray Structure

    DTIC Science & Technology

    1988-08-01

    experiments. Finally, Magnus and Saffman-lift forces and static pressure gradients can be ignored with little error (Faeth, 1977, 1983, 1988). Under...full-cone sprays. Recent Advances in Gas ] DInamics (C. Casci, ed.), Plenum Publishing Corporation, New York 78 Chehroudi, B., Onuma, Y., Chen, S.-H

  12. Direct numerical simulation of moderate-Reynolds-number flow past arrays of rotating spheres

    NASA Astrophysics Data System (ADS)

    Zhou, Qiang; Fan, Liang-Shih

    2015-07-01

    Direct numerical simulations with an immersed boundary-lattice Boltzmann method are used to investigate the effects of particle rotation on flows past random arrays of mono-disperse spheres at moderate particle Reynolds numbers. This study is an extension of a previous study of the authors [Q. Zhou and L.-S. Fan, "Direct numerical simulation of low-Reynolds-number flow past arrays of rotating spheres," J. Fluid Mech. 765, 396-423 (2015)] that explored the effects of particle rotation at low particle Reynolds numbers. The results of this study indicate that as the particle Reynolds number increases, the normalized Magnus lift force decreases rapidly when the particle Reynolds number is in the range lower than 50. For the particle Reynolds number greater than 50, the normalized Magnus lift force approaches a constant value that is invariant with solid volume fractions. The proportional dependence of the Magnus lift force on the rotational Reynolds number (based on the angular velocity and the diameter of the spheres) observed at low particle Reynolds numbers does not change in the present study, making the Magnus lift force another possible factor that can significantly affect the overall dynamics of fluid-particle flows other than the drag force. Moreover, it is found that both the normalized drag force and the normalized torque increase with the increase of the particle Reynolds number and the solid volume fraction. Finally, correlations for the drag force, the Magnus lift force, and the torque in random arrays of rotating spheres at arbitrary solids volume fractions, rotational Reynolds numbers, and particle Reynolds numbers are formulated.

  13. Flight dynamics of a spinning projectile descending on a parachute

    SciTech Connect

    Benedetti, G.A.

    1989-02-01

    During the past twenty years Sandia National Laboratories and the US Army have vertically gun launched numerous 155mm and eight-inch diameter flight test projectiles. These projectiles are subsequently recovered using an on-board parachute recovery system which is attached to the forward case structure of the projectile. There have been at least five attempts to describe, through analytical and numerical simulations, the translational and rotational motions of a spinning projectile descending on a parachute. However, none of these investigations have correctly described the large nutational motion of the projectile since all of them overlooked the fundamental mechanism which causes these angular motions. Numerical simulations as well as a closed form analytical solution show conclusively that the Magnus moment is responsible for the large nutational motion of the projectile. That is, when the center of pressure for the Magnus force is aft of the center of mass for the projectile, the Magnus moment causes an unstable (or large) nutational motion which always tends to turn the spinning projectile upside down while it is descending on the parachute. Conversely, when the center of mass for the projectile is aft of the center of pressure for the Magnus force, the Magnus moment stabilizes the nutational motion tending to always point the base of the spinning projectile down. The results of this work are utilized to render projectile parachute recovery systems more reliable and to explain what initially may appear to be strange gyrodynamic behavior of a spinning projectile descending on a parachute. 14 refs., 20 figs.

  14. 2014 NASA Centennial Challenges Sample Return Robot Challenge

    NASA Image and Video Library

    2014-06-14

    Ahti Heinla, left, and Sulo Kallas, right, from Estonia, prepare team KuuKulgur's robot for the rerun of the level one challenge during the 2014 NASA Centennial Challenges Sample Return Robot Challenge, Saturday, June 14, 2014, at the Worcester Polytechnic Institute (WPI) in Worcester, Mass. Eighteen teams are competing for a $1.5 million NASA prize purse. Teams will be required to demonstrate autonomous robots that can locate and collect samples from a wide and varied terrain, operating without human control. The objective of this NASA-WPI Centennial Challenge is to encourage innovations in autonomous navigation and robotics technologies. Innovations stemming from the challenge may improve NASA's capability to explore a variety of destinations in space, as well as enhance the nation's robotic technology for use in industries and applications on Earth. Photo Credit: (NASA/Joel Kowsky)

  15. Hamiltonian Engineering for High Fidelity Quantum Operations

    NASA Astrophysics Data System (ADS)

    Ribeiro, Hugo; Baksic, Alexandre; Clerk, Aashish

    High-fidelity gates and operations are crucial to almost every aspect of quantum information processing. In recent experiments, fidelity is mostly limited by unwanted couplings with states living out of the logical subspace. This results in both leakage and phase errors. Here, we present a general method to deal simultaneously with both these issues and improve the fidelity of quantum gates and operations. Our method is applicable to a wide variety of systems. As an example, we can correct gates for superconducting qubits, improve coherent state transfer between a single NV centre electronic spin and a single nitrogen nuclear spin, improve control over a nuclear spin ensemble, etc. Our method is intimately linked to the Magnus expansion. By modifying the Magnus expansion of an initially given Hamiltonian Hi, we find analytically additional control Hamiltonians Hctrl such that Hi +Hctrl leads to the desired gate while minimizing both leakage and phase errors.

  16. Magnetic bilayer-skyrmions without skyrmion Hall effect

    PubMed Central

    Zhang, Xichao; Zhou, Yan; Ezawa, Motohiko

    2016-01-01

    Magnetic skyrmions might be used as information carriers in future advanced memories, logic gates and computing devices. However, there exists an obstacle known as the skyrmion Hall effect (SkHE), that is, the skyrmion trajectories bend away from the driving current direction due to the Magnus force. Consequently, the skyrmions in constricted geometries may be destroyed by touching the sample edges. Here we theoretically propose that the SkHE can be suppressed in the antiferromagnetically exchange-coupled bilayer system, since the Magnus forces in the top and bottom layers are exactly cancelled. We show that such a pair of SkHE-free magnetic skyrmions can be nucleated and be driven by the current-induced torque. Our proposal provides a promising means to move magnetic skyrmions in a perfectly straight trajectory in ultra-dense devices with ultra-fast processing speed. PMID:26782905

  17. Paradoxical pop-ups: Why are they difficult to catch?

    NASA Astrophysics Data System (ADS)

    McBeath, Michael K.; Nathan, Alan M.; Bahill, A. Terry; Baldwin, David G.

    2008-08-01

    Professional baseball players occasionally find it difficult to gracefully approach seemingly routine pop-ups. We describe a set of towering pop-ups with trajectories that exhibit cusps and loops near the apex. For a normal fly ball the horizontal velocity continuously decreases due to drag caused by air resistance. For pop-ups the Magnus force is larger than the drag force. In these cases the horizontal velocity initially decreases like a normal fly ball, but after the apex, the Magnus force accelerates the horizontal motion. We refer to this class of pop-ups as paradoxical because they appear to misinform the typically robust optical control strategies used by fielders and lead to systematic vacillation in running paths, especially when a trajectory terminates near the fielder. Former major league infielders confirm that our model agrees with their experiences.

  18. Adiabatic effective action for vortices in neutral and charged superfluids

    SciTech Connect

    Hatsuda, M.; Sato, M.; Yahikozawa, S.; Hatsuda, T.

    1996-07-10

    Adiabatic effective action for vortices in neutral and charged superfluids at zero temperature are calculated using the topological Landau-Ginzburg theory recently proposed by Hatsuda, Yahikozawa, Ao and Thouless, and vortex dynamics are examined. The Berry phase term arising in the effective action naturally yields the Magnus force in both neutral and charged superfluids. It is shown that in neutral superfluid there is only one degree of freedom, namely the center of vorticities, and the vortex energy is proportional to the sum of all vorticities so that it is finite only for the vanishing total vorticity of the system. On the other hand the effective mass and the vortex energy for a vortex in charged superfluids are defined individually as expected. The effects of the vortex core on these quantities are also estimated. The possible depinning scenario which is governed by the Magnus force and the inertial mass is also discussed.

  19. Computation of hypersonic laminar viscous flow past spinning sharp and blunt cones at high angle of attack

    NASA Technical Reports Server (NTRS)

    Agarwal, R.; Rakich, J. V.

    1978-01-01

    Computational results, obtained with a parabolic Navier-Stokes marching code, are presented for hypersonic viscous flow past spinning sharp and blunt cones at angle of attack. The code takes into account the asymmetries in the flow field resulting from spinning motion and computes the asymmetric shock shape, crossflow and streamwise shear, heat transfer, crossflow separation, and vortex structure. The Magnus force and moments are also computed. Comparisons are made with other theoretical analyses based on boundary-layer and boundary-region equations, and an anomaly is discovered in the displacement thickness contribution to the Magnus force when compared with boundary-layer results. In addition, a new criterion for defining crossflow separation behind spinning bodies is introduced which generalizes the Moore-Rott-Sears criterion for two-dimensional unsteady separation. A condition which characterizes the onset of separation in the flow field is defined.

  20. Magnetic bilayer-skyrmions without skyrmion Hall effect.

    PubMed

    Zhang, Xichao; Zhou, Yan; Ezawa, Motohiko

    2016-01-19

    Magnetic skyrmions might be used as information carriers in future advanced memories, logic gates and computing devices. However, there exists an obstacle known as the skyrmion Hall effect (SkHE), that is, the skyrmion trajectories bend away from the driving current direction due to the Magnus force. Consequently, the skyrmions in constricted geometries may be destroyed by touching the sample edges. Here we theoretically propose that the SkHE can be suppressed in the antiferromagnetically exchange-coupled bilayer system, since the Magnus forces in the top and bottom layers are exactly cancelled. We show that such a pair of SkHE-free magnetic skyrmions can be nucleated and be driven by the current-induced torque. Our proposal provides a promising means to move magnetic skyrmions in a perfectly straight trajectory in ultra-dense devices with ultra-fast processing speed.

  1. Computation of supersonic turbulent flow past a spinning cone

    NASA Technical Reports Server (NTRS)

    Agarwal, R. K.

    1982-01-01

    Computational results are presented for supersonic laminar and turbulent flow past a pointed cone at angle of attack obtained with a parabolic Navier-Stokes marching code. The code takes into account the asymmetries in the flowfield resulting from spinning motion and computes the asymmetric shock shape, crossflow and streamwise shear, heat transfer, crossflow separation, and vortex structure. The Magnus force and moments are also computed. Comparisons are made with other analyses based on boundary-layer equations. For certain laminar flow conditions, an anomaly is discovered in the displacement thickness contribution to the Magnus force when compared with boundary-layer results. For turbulent flow, at small angles of attack, good agreement is obtained with the experimental data and other theoretical results.

  2. Fluctuations and noise signatures of driven magnetic skyrmions

    NASA Astrophysics Data System (ADS)

    Díaz, Sebastián A.; Reichhardt, C. J. O.; Arovas, Daniel P.; Saxena, Avadh; Reichhardt, C.

    2017-08-01

    Magnetic skyrmions are particlelike objects with topologically protected stability which can be set into motion with an applied current. Using a particle-based model we simulate current-driven magnetic skyrmions interacting with random quenched disorder and examine the skyrmion velocity fluctuations parallel and perpendicular to the direction of motion as a function of increasing drive. We show that the Magnus force contribution to skyrmion dynamics combined with the random pinning produces an isotropic effective shaking temperature. As a result, the skyrmions form a moving crystal at large drives instead of the moving smectic state observed in systems with a negligible Magnus force where the effective shaking temperature is anisotropic. We demonstrate that spectral analysis of the velocity noise fluctuations can be used to identify dynamical phase transitions and to extract information about the different dynamic phases, and show how the velocity noise fluctuations are correlated with changes in the skyrmion Hall angle, transport features, and skyrmion lattice structure.

  3. Heat capacity of pancake vortices in layered superconductors

    SciTech Connect

    Fetter, A.L.; Patel, S.R.

    1996-12-01

    The heat capacity of a lattice of pancake vortices in a layered superconductor with perpendicular magnetic field {ital B} is evaluated in the limit {ital H}{sub {ital c}1}{lt}{ital B}{lt}{ital H}{sub {ital c}2}. The coupled dynamical equations for small oscillations of the vortex lattice are solved for general values of the vortex mass {ital m}{sub {ital v}}, the Magnus force parameter {alpha}, and the viscosity {eta}{ital s}, where {ital s} is the interlayer separation, and the contribution of each normal mode is expressed as a Fourier integral involving the correlation functions of the fluctuating random forces. The total heat capacity per vortex is found numerically for various values of the dimensionless ratio {alpha}/{eta}{ital s} that characterizes the relative importance of the Magnus force and the viscous drag force. {copyright} {ital 1996 The American Physical Society.}

  4. Numerical algorithms for highly oscillatory dynamic system based on commutator-free method

    NASA Astrophysics Data System (ADS)

    Li, Wencheng; Deng, Zichen; Zhang, Suying

    2007-04-01

    In the present paper, an efficiently improved modified Magnus integrator algorithm based on commutator-free method is proposed for the second-order dynamic systems with time-dependent high frequencies. Firstly, the second-order dynamic systems are transferred to the frame of reference by introducing new variable so that highly oscillatory behaviour inherited from the entries. Then the modified Magnus integrator method based on local linearization is appropriately designed for solving the above new form. And some optimized strategies for reducing the number of function evaluations and matrix operations are also suggested. Finally, several numerical examples for highly oscillatory dynamic systems, such as Airy equation, Bessel equation, Mathieu equation, are presented to demonstrate the validity and effectiveness of the proposed method.

  5. STS-112 crew walks out of O&C building before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- Still waving at spectators, the STS-112 crew heads for the Astrovan that will take them to Launch Pad 39B and Space Shuttle Atlantis. Liftoff is scheduled for 3:46 p.m. EDT. From left are Mission Specialists Fyodor Yurchikhin David Wolf, and Piers Sellers; Pilot Pamela Melroy; Mission Specialist Sandra Magnus; and Commander Jeffrey Ashby. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure, the first starboard truss segment, to be attached to the central truss segment, S0, and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss to the Station.

  6. STS-112 crew after arrival at SLF for launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- The STS-112 crew pauses for a photo after their arrival at the KSC Shuttle Landing Facility. Standing, left to right, are Mission Specialist Piers Sellers, Pilot Pamela Melroy, Commander Jeffrey Ashby, and Mission Specialists David Wolf, Sandra Magnus and cosmonaut Fyodor Yurchikhin. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112, aboard Space Shuttle Atlantis, is the 15th assembly mission to the International Space Station. Atlantis will be carrying the S1 Integrated Truss Structure, the first starboard truss segment, to be attached to the central truss segment, S0, and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. The 11-day mission includes three spacewalks. Launch is scheduled for Oct. 2 between 2 and 6 p.m.

  7. KSC-02pd1452

    NASA Image and Video Library

    2002-10-07

    KENNEDY SPACE CENTER, FLA. -- Still waving at spectators, the STS-112 crew heads for the Astrovan that will take them to Launch Pad 39B and Space Shuttle Atlantis. Liftoff is scheduled for 3:46 p.m. EDT. From left are Mission Specialists Fyodor Yurchikhin David Wolf, and Piers Sellers; Pilot Pamela Melroy; Mission Specialist Sandra Magnus; and Commander Jeffrey Ashby. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure, the first starboard truss segment, to be attached to the central truss segment, S0, and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss to the Station.

  8. Byzantine doctrines on uroscopy in the Liber Orinalibus of Hermogenes (codex 69 Montecassino).

    PubMed

    Iorio, Luigi; Lamagna, Mario

    2011-01-01

    The Liber medicine orinalibus (codex 69 Montecassino) of Hermogenes is the first known manuscript to have a Latin translation from the original Greek work of Magnus of Emesa (or Nisibis). The particular text here translated, from the so-called Commentatio, mentions direct transliteration of Greek concepts such as chyma and hypostasis, suggesting that the Latin text derived directly from the Greek original, without the intermediation of Arabic translations. The implementation of our text is considered to have been undertaken in the city of Ravenna, which housed a medical school during the sixth century ad, or in southern Italy, with its scriptoria. Evidence of the presence of Latin translations of Greek medical texts in Calabria during the Gothic age is provided by Cassiodorus (Inst. 1, 31, 2). The Greek to Latin workshops testify to an uninterrupted activity of copying from Greek medical texts, with particular attention to the Iatrosophists of the Alexandrian school, of which Magnus was a representative.

  9. STS-112 crew walks out of O&C building before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- Still waving at spectators, the STS-112 crew heads for the Astrovan that will take them to Launch Pad 39B and Space Shuttle Atlantis. Liftoff is scheduled for 3:46 p.m. EDT. From left are Mission Specialists Fyodor Yurchikhin David Wolf, and Piers Sellers; Pilot Pamela Melroy; Mission Specialist Sandra Magnus; and Commander Jeffrey Ashby. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure, the first starboard truss segment, to be attached to the central truss segment, S0, and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss to the Station.

  10. STS-112 crew after arrival at SLF for launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- The STS-112 crew pauses for a photo after their arrival at the KSC Shuttle Landing Facility. Standing, left to right, are Mission Specialist Piers Sellers, Pilot Pamela Melroy, Commander Jeffrey Ashby, and Mission Specialists David Wolf, Sandra Magnus and cosmonaut Fyodor Yurchikhin. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112, aboard Space Shuttle Atlantis, is the 15th assembly mission to the International Space Station. Atlantis will be carrying the S1 Integrated Truss Structure, the first starboard truss segment, to be attached to the central truss segment, S0, and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. The 11-day mission includes three spacewalks. Launch is scheduled for Oct. 2 between 2 and 6 p.m.

  11. Computation of hypersonic laminar viscous flow past spinning sharp and blunt cones at high angle of attack

    NASA Technical Reports Server (NTRS)

    Agarwal, R.; Rakich, J. V.

    1978-01-01

    Computational results, obtained with a parabolic Navier-Stokes marching code, are presented for hypersonic viscous flow past spinning sharp and blunt cones at angle of attack. The code takes into account the asymmetries in the flow field resulting from spinning motion and computes the asymmetric shock shape, crossflow and streamwise shear, heat transfer, crossflow separation, and vortex structure. The Magnus force and moments are also computed. Comparisons are made with other theoretical analyses based on boundary-layer and boundary-region equations, and an anomaly is discovered in the displacement thickness contribution to the Magnus force when compared with boundary-layer results. In addition, a new criterion for defining crossflow separation behind spinning bodies is introduced which generalizes the Moore-Rott-Sears criterion for two-dimensional unsteady separation. A condition which characterizes the onset of separation in the flow field is defined.

  12. Collective Transport Properties of Driven Skyrmions with Random Disorder

    NASA Astrophysics Data System (ADS)

    Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

    2015-05-01

    We use particle-based simulations to examine the static and driven collective phases of Skyrmions interacting with random quenched disorder. We show that nondissipative effects due to the Magnus term reduce the depinning threshold and strongly affect the Skyrmion motion and the nature of the dynamic phases. The quenched disorder causes the Hall angle to become drive dependent in the moving Skyrmion phase, while different flow regimes produce distinct signatures in the transport curves. For weak disorder, the Skyrmions form a pinned crystal and depin elastically, while for strong disorder the system forms a pinned amorphous state that depins plastically. At high drives the Skyrmions can dynamically reorder into a moving crystal, with the onset of reordering determined by the strength of the Magnus term.

  13. Computation of supersonic turbulent flow past a spinning cone

    NASA Technical Reports Server (NTRS)

    Agarwal, R. K.

    1982-01-01

    Computational results are presented for supersonic laminar and turbulent flow past a pointed cone at angle of attack obtained with a parabolic Navier-Stokes marching code. The code takes into account the asymmetries in the flowfield resulting from spinning motion and computes the asymmetric shock shape, crossflow and streamwise shear, heat transfer, crossflow separation, and vortex structure. The Magnus force and moments are also computed. Comparisons are made with other analyses based on boundary-layer equations. For certain laminar flow conditions, an anomaly is discovered in the displacement thickness contribution to the Magnus force when compared with boundary-layer results. For turbulent flow, at small angles of attack, good agreement is obtained with the experimental data and other theoretical results.

  14. Magnetic bilayer-skyrmions without skyrmion Hall effect

    NASA Astrophysics Data System (ADS)

    Zhang, Xichao; Zhou, Yan; Ezawa, Motohiko

    2016-01-01

    Magnetic skyrmions might be used as information carriers in future advanced memories, logic gates and computing devices. However, there exists an obstacle known as the skyrmion Hall effect (SkHE), that is, the skyrmion trajectories bend away from the driving current direction due to the Magnus force. Consequently, the skyrmions in constricted geometries may be destroyed by touching the sample edges. Here we theoretically propose that the SkHE can be suppressed in the antiferromagnetically exchange-coupled bilayer system, since the Magnus forces in the top and bottom layers are exactly cancelled. We show that such a pair of SkHE-free magnetic skyrmions can be nucleated and be driven by the current-induced torque. Our proposal provides a promising means to move magnetic skyrmions in a perfectly straight trajectory in ultra-dense devices with ultra-fast processing speed.

  15. Vortex dynamics in self-dual Chern-Simons-Higgs systems

    SciTech Connect

    Kim, Y. ); Lee, K. )

    1994-02-15

    We consider vortex dynamics in self-dual Chern-Simons-Higgs systems. We show that the naive Aharonov-Bohm phase is the inverse of the statistical phase expected from the vortex spin, and that the self-dual configurations of vortices are degenerate in energy but not in angular momentum. We also use the path integral formalism to derive the dual formulation of Chern-Simons-Higgs systems in which vortices appear as charged particles. We argue that in addition to the electromagnetic interaction, there is an additional interaction between vortices, the so-called Magnus force, and that these forces can be put together into a single dual electromagnetic'' interaction. This dual electromagnetic interaction leads to the right statistical phase. We also derive and study the effective action for slowly moving vortices, which contains terms both linear and quadratic in the vortex velocity. We show that vortices can be bounded to each other by the Magnus force.

  16. Exploring unconventional capabilities of holographic tweezers

    NASA Astrophysics Data System (ADS)

    Hernandez, R. J.; Pagliusi, P.; Provenzano, C.; Cipparrone, G.

    2011-06-01

    We report an investigation of manipulation and trapping capabilities of polarization holographic tweezers. A polarization gradient connected with a modulation of the ellipticity shows an optical force related to the polarization of the light that can influence optically isotropic particles. While in the case of birefringent particles an unconventional trapping in circularly polarized fringes is observed. A liquid crystal emulsion has been adopted to investigate the capabilities of the holographic tweezers. The unusual trapping observed for rotating bipolar nematic droplets has suggested the involvement of the lift hydrodynamic force responsible of the Magnus effect, originating from the peculiar optical force field. We show that the Magnus force which is ignored in the common approach can contribute to unconventional optohydrodynamic trapping and manipulation.

  17. Sally Ride Tribute

    NASA Image and Video Library

    2013-05-20

    From left, astronauts Pam Melroy; Kay Hire; Cady Coleman; Kathy Sullivan; Tam O'Shaughnessy, Sally Ride's life partner and chair, board of directors of Sally Ride Science; astronauts Bonnie Dunbar; Sandy Magnus; Julie Payette; and Ellen Ochoa, pose for a photograph before a National Tribute to Sally Ride at the John F. Kennedy Center for the Performing Arts, Monday, May 20, 2013 in Washington. Photo Credit: (NASA/Bill Ingalls)

  18. Fußball mit Wissenschaftlichem Maß: Bananenflanken, Flatterbälle, Kopfballkämpfe

    NASA Astrophysics Data System (ADS)

    Mathelitsch, Leopold; Thaller, Sigrid

    2006-05-01

    Die physikalische Betrachtung des Fußballs liefert spannende Resultate. Wegen der geringen Torzahl spielt der Zufall bei Sieg oder Niederlage stärker mit als in anderen Sportarten. Fußball ist daher mit gewissen statistischen Eigenschaften radioaktiver Quellen vergleichbar. Gleich mehrere physikalische Effekte beeinflussen die Flugbahn des Balls. Der Magnus-Effekt zum Beispiel ermöglicht erst Bananenflanken. Pfeift ein Schiedsrichter falsch, dann wird er nicht selten von seiner Sehperspektive getäuscht.

  19. Efficient numerical integration of neutrino oscillations in matter

    NASA Astrophysics Data System (ADS)

    Casas, F.; D'Olivo, J. C.; Oteo, J. A.

    2016-12-01

    A special purpose solver, based on the Magnus expansion, well suited for the integration of the linear three neutrino oscillations equations in matter is proposed. The computations are speeded up to two orders of magnitude with respect to a general numerical integrator, a fact that could smooth the way for massive numerical integration concomitant with experimental data analyses. Detailed illustrations about numerical procedure and computer time costs are provided.

  20. Clinics in diagnostic imaging (71). Left iliopsoas abscess secondary to vertebral osteomyelitis.

    PubMed

    Muttarak, M; Peh, W C G

    2002-03-01

    A 26-year-old woman presented with a progressively painful lump at her left groin and upper thigh for five months. She also had intermittent back pain for three years. Radiographs and CT showed osteolytic destruction of the several contiguous thoracolumbar vertebrae with a large left iliopsoas abscess that extended to involve the left gluteus maximus and adductor magnus muscles. She responded well to a course of antibiotics. The role of imaging and imaging features of iliopsoas abscesses are discussed, together

  1. Quantum depinning of flux lines from columnar defects

    SciTech Connect

    Chudnovsky, E.M. ); Ferrera, A.; Vilenkin, A. )

    1995-01-01

    The depinning of a flux line from a columnar defect is studied within the path-integral approach. Instantons of the quantum field theory in 1+1 dimensions are computed for the flux line whose dynamics is dominated by the Magnus force. The universal temperature dependence of the decay rate in the proximity of the critical current is obtained. This problem provides an example of macroscopic quantum tunneling, which is accessible to the direct comparison between theory and experiment.

  2. Dynamics of skyrmions in chiral magnets: Dynamic phase transitions and equation of motion

    NASA Astrophysics Data System (ADS)

    Lin, Shi-Zeng; Reichhardt, Charles; Batista, Cristian D.; Saxena, Avadh

    2014-05-01

    We study the dynamics of skyrmions in a metallic chiral magnet. First, we show that skyrmions can be created dynamically by destabilizing the ferromagnetic background state through a spin polarized current. We then treat skyrmions as rigid particles and derive the corresponding equation of motion. The dynamics of skyrmions is dominated by the Magnus force, which accounts for the weak pinning of skyrmions observed in experiments. Finally, we discuss the quantum motion of skyrmions.

  3. Dynamics of skyrmions in chiral magnets: Dynamic phase transitions and equation of motion

    SciTech Connect

    Lin, Shi-Zeng Reichhardt, Charles; Batista, Cristian D.; Saxena, Avadh

    2014-05-07

    We study the dynamics of skyrmions in a metallic chiral magnet. First, we show that skyrmions can be created dynamically by destabilizing the ferromagnetic background state through a spin polarized current. We then treat skyrmions as rigid particles and derive the corresponding equation of motion. The dynamics of skyrmions is dominated by the Magnus force, which accounts for the weak pinning of skyrmions observed in experiments. Finally, we discuss the quantum motion of skyrmions.

  4. STS-135 crew during AEM (Animal Enclosure Module) training

    NASA Image and Video Library

    2011-03-25

    JSC2011-E-029133 (25 March 2011) --- STS-135 crew members participate in an Animal Enclosure Module (AEM) training session in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Pictured from the right are NASA astronauts Chris Ferguson, commander; Sandy Magnus and Rex Walheim, both mission specialists. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  5. New Numerical Integrators Based on Solvability and Splitting

    DTIC Science & Technology

    2007-11-02

    display a currently valid OMB control number. 1. REPORT DATE 03 JAN 2005 2. REPORT TYPE N/A 3. DATES COVERED - 4. TITLE AND SUBTITLE New...Group Methods And Control Theory Workshop Held on 28 June 2004 - 1 July 2004., The original document contains color images. 14. ABSTRACT 15...Mechanics, NMR spectroscopy, infrared divergences in QED, control theory,... 1.1 Magnus expansion (IV) NEW NUMERICAL INTEGRATORS BASED ON SOLVABILITY AND

  6. STS-112 Crew Portrait

    NASA Technical Reports Server (NTRS)

    2002-01-01

    JOHNSON SPACE CENTER, HOUSTON, TEXAS -- (STS112-S-002) These five astronauts and cosmonaut take a break from training to pose for the STS-112 crew portrait. Astronauts Pamela A. Melroy and Jeffrey S. Ashby, pilot and commander respectively, are in the cen ter of the photo. The mission specialists are from left to right, astronauts Sandra H. Magnus, David A. Wolf and Piers J. Sellers, and cosmonaut Fyodor Yurchikhin, who represents Rosaviakosmos.

  7. STS_135_ MEDIA

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060797 (30 June 2011) --- Commander Chris Ferguson, pilot Doug Hurley, mission specialist Sandy Magnus and mission specialist Rex Walheim participate in the STS-135 crew media briefing at NASA?s Johnson Space Center June 30, 2011. The press conference provided the last scheduled opportunity for a large group of press to speak with the crew before the final launch on July 8. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  8. The importance of soft tissue stabilization in trans-femoral amputation : English version.

    PubMed

    Gottschalk, F

    2016-03-01

    Transfemoral amputations with more proximal amputation levels have the problem of secondary development into flexion and abduction contractures. This is induced by muscle imbalance, especially the loss of adductor muscle insertions when abductor muscle insertions are preserved. This causes considerable problems when fitting prosthetics. Myodesis with insertion of the distally detached adductor magnus muscle to the lateral femoral cortex, introduced here, results in a stronger stump with good muscle balance, and prosthetics fitting is significantly improved.

  9. Lab-on-a-Chip Application Development-Portable Test System (LOCAD) Phase 2

    NASA Image and Video Library

    2009-03-21

    ISS018-E-041370 (21 March 2009) --- Astronaut Sandra Magnus, STS-119 mission specialist, prepares to work with the Lab-on-a-Chip Application Development-Portable Test System (LOCAD-PTS) experiment in the Destiny laboratory while Space Shuttle Discovery remains docked with the International Space Station. LOCAD-PTS is a handheld device for rapid detection of biological and chemical substances onboard the station.

  10. Control Mechanism Strategies for Spin-Stabilized Projectiles

    DTIC Science & Technology

    2008-09-01

    maneuver footprint shape was dictated by the angle -of-fall and yaw of repose . Shallow angles -of-fall produced footprint ellipses, with a major axis...Magnus moments and yaw of repose . Adding a control mechanism such as fins to guide a spin- stabilized projectile further complicates the resulting...ratio), and the roll window over which the pulsed controller operated. The metrics of this analysis were the maneuver footprint, total angle of attack

  11. [Book review] The Sound Approach to Birding: A Guide to Understanding Bird Sound. --Mark Constantine and The Sound Approach. 2006. Poole, Dorset, United Kingdom.192 pp. + 2 CDs

    USGS Publications Warehouse

    Robbins, C.S.

    2007-01-01

    What is the ?Sound Approach?? It is a trio of enthusiastic bird-sound recordists?analysts (Arnoud B. van den Berg, Mark Constantine, and Magnus Robb) who, with friends, traveled to 42 countries in a massive effort to record all the songs and calls of the birds of the Western Palearctic. The recordings in this guide are selected from the 30,000 or so recorded digitally with stereo microphones by the authors since the year 2000.

  12. The Ecology and Environmental Impacts of Hydrilla

    DTIC Science & Technology

    1992-10-15

    guadalupensis (Spreng.) Magnus) and egeria ( Egeria densa ) were the dominant submersed weeds. The other aquatic plants were found only in small areas of...naiad and egeria became a problem in several areas of the lake; but by late fall, the submersed weed growth was still a minor problem. Local state...species having the greatest frequencies of occurrence were egeria , southern naiad, and hydrilla. A second survey was made on May 28, 1974 to record

  13. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028144 (23 March 2011) --- NASA astronauts Chris Ferguson (left foreground), STS-135 commander; Doug Hurley (left background), pilot; and Sandy Magnus (left), mission specialist, speak with news media representatives during an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  14. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028134 (23 March 2011) --- NASA astronauts Chris Ferguson (left), STS-135 commander; Doug Hurley (right), pilot; and Sandy Magnus, mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  15. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028137 (23 March 2011) --- NASA astronauts Chris Ferguson (left background), STS-135 commander; Doug Hurley (foreground), pilot; and Sandy Magnus, mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  16. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028139 (23 March 2011) --- NASA astronauts Chris Ferguson (left), STS-135 commander; Doug Hurley (center), pilot; and Sandy Magnus, mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  17. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028130 (23 March 2011) --- NASA astronauts Chris Ferguson (right background), STS-135 commander; Doug Hurley (center), pilot; and Sandy Magnus, mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  18. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028142 (23 March 2011) --- NASA astronauts Chris Ferguson (left foreground), STS-135 commander; Doug Hurley (left background), pilot; and Sandy Magnus (left), mission specialist, speak with news media representatives during an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  19. STS-135 crew during Rendezvous Training session in Building 16 dome

    NASA Image and Video Library

    2011-03-23

    JSC2011-E-028132 (23 March 2011) --- As news media representatives look on, NASA astronauts Chris Ferguson, STS-135 commander; Doug Hurley, pilot; and Sandy Magnus, mission specialist, participate in an exercise in the systems engineering simulator in the Avionics Systems Laboratory at NASA's Johnson Space Center. The facility includes moving scenes of full-sized International Space Station components over a simulated Earth. Photo credit: NASA or National Aeronautics and Space Administration

  20. Agent-Based Simulation of a Marine Infantry Squad in an Urban Environment

    DTIC Science & Technology

    2001-09-01

    tailored to those specific models. The Unified Modeling Language, UML , class diagram in Figure 2 shows the hierarchy of objects that represent the models...Magnus Penker. UML Toolkit. John Wiley & Sons, INC. 1998. Hofmeister, Christine, Robert Nord, and Dilip Soni. Applied Software Architecture...Koosis. Java™ Programming For Dummies ,. 3rd Edition. IDG Books WorldWide, Inc. 1998. Rothenberg, Jeff. “Object-Oriented Simulation: Where Do We

  1. Dredging Research Program: NMLONG: Numerical Model for Simulating the Longshore Current. Report 1. Model Development and Tests.

    DTIC Science & Technology

    1991-06-01

    Corps of Engineers 3909 Halls Ferry Road, Vicksburg, Mississippi 39180-6199 and Magnus Larson Department of Water Resources Engineering Lund Institute...Analysis of Dredged Material Placed in Open Waters Area 2 - Material Properties Related to Navigation and Dredging Area 3 - Dredge Plant Equipment and...Waterways Experiment Station, Corps of Engineers 3909 Halls Ferry Road, Vicksburg, MS 39180-6199 Department of Water Resources Engineering Lund Institute of

  2. STS-112 takes part in post-landing briefing for the media

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- The STS-112 crew takes part in a post-landing briefing for the media. From left are Mission Specialists David Wolf, Sandra Magnus, responding to a question, and Piers Sellers. Mission STS-112 was the 15th assembly flight to the International Space Station, installing the S1 truss. The landing was the 60th at KSC in the history of the Shuttle program.

  3. STS-112 crew inspects S1 Truss in O&C building

    NASA Technical Reports Server (NTRS)

    2001-01-01

    KENNEDY SPACE CENTER, Fla. -- In the Operations and Checkout Bldg,, members of the STS-112 crew look over the Integrated Truss Structure (ITS) S1 that will be part of the payload on the mission. The crew comprises Commander Jeffrey S. Ashby, Pilot Pamela A. Melroy and Mission Specialists David A. Wolf, Piers J. Sellers, Sandra H. Magnus and Fyodor Nikolayevich Yurchikhin, a cosmonaut with the Russian Aviation and Space Agency. Mission STS-112 is scheduled for launch in July 2002.

  4. STS-112 crew inspects S1 Truss in O&C building

    NASA Technical Reports Server (NTRS)

    2001-01-01

    KENNEDY SPACE CENTER, Fla. -- In the Operations and Checkout Bldg., STS-112 Pilot Pamela A. Melroy gets a close look at the Integrated Truss Structure (ITS) S1 that will be part of the payload on the mission. Other members of the crew are Commander Jeffrey S. Ashby and Mission Specialists David A. Wolf, Piers J. Sellers, Sandra H. Magnus and Fyodor Nikolayevich Yurchikhin, a cosmonaut with the Russian Aviation and Space Agency. Mission STS-112 is scheduled for launch in July 2002.

  5. Crewmembers on Flight Deck after Undocking

    NASA Image and Video Library

    2011-07-19

    S135-E-010771 (19 July 2011) --- While his crewmates take pictures out overhead windows, NASA astronaut Chris Ferguson (foreground), commander, consults a check list (out of frame)right foreground following Atlantis' separation from the International Space Station on the 12th day of the STS-135 mission. From left, at work in the background, are NASA astronauts Doug Hurley, pilot, and Sandy Magnus and Rex Walheim, both mission specialists, Photo credit: NASA

  6. STS-135 New York City Visit

    NASA Image and Video Library

    2011-08-16

    201108160008hq (16 Aug. 2011) --- Stephen Colbert, host of The Colbert Report, salutes the crew of STS-135, seated from lower left, NASA astronauts Chris Ferguson, commander; Doug Hurley, pilot; Sandy Magnus and Rex Walheim, both mission specialists, during their appearance for a taping of his television show, Aug. 16, 2011, in New York. The astronauts from STS-135 are in New York for a three-day visit. Photo credit: NASA/Paul E. Alers

  7. US Army War College Information Operations Primer

    DTIC Science & Technology

    2009-11-01

    Steve Iatrou from the Information Operations Center of Excellence, Naval Postgraduate School: Mr. Paul Palmer and COL Mike Dominique USA, both...International Transformation Conference, June 3, 2009). 5 Cebrowski, 7. 6 Magnus Ekman et al., An In-Depth Look at Computer Performance Growth, Technical...Dominique Program Manage/Deputy Mr. Paul Palmer; YC-02 OPERATIONS Chief of Operations Mr. Cameron M. Wesson; YC-02 Information Engagements Ms

  8. STS-335 food tasting in the JSC Food Lab

    NASA Image and Video Library

    2010-11-12

    JSC2010-E-185482 (10 Nov. 2010) --- STS-135 crew members participate in a food tasting session in the Habitability and Environmental Factors Office at NASA's Johnson Space Center. Pictured from the left are NASA astronauts Chris Ferguson, commander; Doug Hurley, pilot; Rex Walheim and Sandy Magnus, both mission specialists. Michele Perchonok, manager, Shuttle Food System, assisted the crew members. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  9. [Book review] The sound approach to birding: A guide to understanding bird sound

    USGS Publications Warehouse

    Robbins, C.S.

    2007-01-01

    What is the “Sound Approach”? It is a trio of enthusiastic bird-sound recordists-analysts (Arnoud B. van den Berg, Mark Constantine, and Magnus Robb) who, with friends, traveled to 42 countries in a massive effort to record all the songs and calls of the birds of the Western Palearctic. The recordings in this guide are selected from the 30,000 or so recorded digitally with stereo microphones by the authors since the year 2000.

  10. Polarization effects due to the mutual influence of trajectory parameters and polarization

    NASA Astrophysics Data System (ADS)

    Sadykov, N. R.

    2006-10-01

    In the geometric optics approximation, we comparatively analyze the polarization effects resulting from the influence of polarization on the beam trajectory. We show that the beam trajectory equations describing the optical Magnus effect that are obtained from the canonical Hamilton equations, Fermat principle, and truncated vector wave equations give the same result, coincident with the result in the mode approach. We explain the reasons underlying the previously derived results.

  11. A Review: Numerical Modeling of the Debris Throw of Reinforced Concrete Structures Under Internal Explosions

    DTIC Science & Technology

    2010-07-15

    especially in the early stage of the trajectory is questionable. TNO study on debris cloud • Debris spinning creating the “ Magnus Effect” Spinning...launch; debris trajectory and post ground impact. Results from the simulations of the various stages have been presented and discussed in previous...launch, 4) debris trajectory and 5) post ground impact. It must be recognised that these 5 phases are not cleanly demarcated in time and they are

  12. Post-Lie algebras and factorization theorems

    NASA Astrophysics Data System (ADS)

    Ebrahimi-Fard, Kurusch; Mencattini, Igor; Munthe-Kaas, Hans

    2017-09-01

    In this note we further explore the properties of universal enveloping algebras associated to a post-Lie algebra. Emphasizing the role of the Magnus expansion, we analyze the properties of group like-elements belonging to (suitable completions of) those Hopf algebras. Of particular interest is the case of post-Lie algebras defined in terms of solutions of modified classical Yang-Baxter equations. In this setting we will study factorization properties of the aforementioned group-like elements.

  13. JPRS Report, West Europe

    DTIC Science & Technology

    2007-11-02

    Economy Through 1989 (Jan Magnus Fahlstrom; DAGENS NYHETER, 9 Apr 87) 98 SOCIAL SWEDEN Lapps Weigh Emigration Following Chernobyl Devastation...after Chernobyl the Soviet state is a bogeyman for the rest of the world—in human terms, economically and in the area of envir- onmental technology...election year." 11798 , CS0: 3650/102 99 „«„■P»T SWEDEN SOCIAL LAPPS WEIGH EMIGRATION FOLLOWING CHERNOBYL DEVASTATION Stockholm DAGENS NYHETER

  14. Removing Boundary Layer by Suction

    NASA Technical Reports Server (NTRS)

    Ackeret, J

    1927-01-01

    Through the utilization of the "Magnus effect" on the Flettner rotor ship, the attention of the public has been directed to the underlying physical principle. It has been found that the Prandtl boundary-layer theory furnishes a satisfactory explanation of the observed phenomena. The present article deals with the prevention of this separation or detachment of the flow by drawing the boundary layer into the inside of a body through a slot or slots in its surface.

  15. Physical optics in a uniform gravitational field

    NASA Astrophysics Data System (ADS)

    Hacyan, Shahen

    2012-01-01

    The motion of a (quasi-)plane wave in a uniform gravitational field is studied. It is shown that the energy of an elliptically polarized wave does not propagate along a geodesic, but in a direction that is rotated with respect to the gravitational force. The similarity with the walk-off effect in anisotropic crystals or the optical Magnus effect in inhomogeneous media is pointed out.

  16. The algebraic criteria for the stability of control systems

    NASA Technical Reports Server (NTRS)

    Cremer, H.; Effertz, F. H.

    1986-01-01

    This paper critically examines the standard algebraic criteria for the stability of linear control systems and their proofs, reveals important previously unnoticed connections, and presents new representations. Algebraic stability criteria have also acquired significance for stability studies of non-linear differential equation systems by the Krylov-Bogoljubov-Magnus Method, and allow realization conditions to be determined for classes of broken rational functions as frequency characteristics of electrical network.

  17. Quantum depinning in layered superconductors with defects produced by irradiation

    SciTech Connect

    Bulaevskii, L.N.; Larkin, A.I.; Maley, M.P.; Vinokur, V.M.

    1995-10-01

    We consider Magnus force vortex dynamics in superclean superconductors and calculate the quantum tunneling rate of the pancake vortex creep from the pinning cites in the nondissipative limit. The consideration is based on the exact representation of the one-particle wave functions in the magnetic and electric fields. The obtained results are compared to the experimental data and the possibility of the observation of the discrete structure of the pinned pancake energy levels is discussed.

  18. Earth matter effect on active-sterile neutrino oscillations

    NASA Astrophysics Data System (ADS)

    Acero, Mario A.; Aguilar-Arevalo, Alexis A.; D'Olivo, J. C.

    2011-08-01

    Oscillations between active and sterile neutrinos remain as an open possibility to explain some experimental observations. In a four-neutrino mixing scheme, we use the Magnus expansion of the evolution operator to study the evolution of neutrino flavor amplitudes within the Earth. We apply this formalism to calculate the transition probabilities from active to sterile neutrinos taking into account the matter effect for a varying terrestrial density.

  19. Substitution of Wax and Grease Cleaners With Biodegradable Solvents: Phase 1. Part 2

    DTIC Science & Technology

    1989-09-01

    FREMONT INDUSTRIES GAF CORP. GAMAGET EQUIPMENT, DIV SYBRON CHEMICALS INC. GENERAL TEXAS CORP. 68 GETTY REFINING CO. GIVANDEN CORP. GOODRICH PROJUCT DIV...CHEMICAL PRODUCTS LUFKIN CORP. M-OIL-FREE CO. MACDER!MID CORP. MADISON BIONICS MAGIE BROS. OIL CO. MAGNA IND. CO. LTD. MAGNUS DIV OF ECONOOMICAL LABORATORY...CO. STARKEY CHEMICAL PROCESS CO. STEPAN CO. STERLING-CLARK-LURTON CORP. 71 SUN REFINING & MARKETING CO. SURFACE DYNAMICS USA INC. SUTTON CORP. SWI

  20. Walther Nernst and the development of physical chemistry.

    PubMed

    Ertl, Gerhard

    2015-05-11

    A commemorative symposium took place on the 16th June 2014 in the Magnus House in Berlin on the occasion of the 150th birthday of Walter Nernst. This Essay outlines the important stages in his life and consider the main features in the development of the discipline cofounded by him. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  1. Niche partitioning in a sympatric cryptic species complex.

    PubMed

    Scriven, Jessica J; Whitehorn, Penelope R; Goulson, Dave; Tinsley, Matthew C

    2016-03-01

    Competition theory states that multiple species should not be able to occupy the same niche indefinitely. Morphologically, similar species are expected to be ecologically alike and exhibit little niche differentiation, which makes it difficult to explain the co-occurrence of cryptic species. Here, we investigated interspecific niche differentiation within a complex of cryptic bumblebee species that co-occur extensively in the United Kingdom. We compared the interspecific variation along different niche dimensions, to determine how they partition a niche to avoid competitive exclusion. We studied the species B. cryptarum, B. lucorum, and B. magnus at a single location in the northwest of Scotland throughout the flight season. Using mitochondrial DNA for species identification, we investigated differences in phenology, response to weather variables and forage use. We also estimated niche region and niche overlap between different castes of the three species. Our results show varying levels of niche partitioning between the bumblebee species along three niche dimensions. The species had contrasting phenologies: The phenology of B. magnus was delayed relative to the other two species, while B. cryptarum had a relatively extended phenology, with workers and males more common than B. lucorum early and late in the season. We found divergent thermal specialisation: In contrast to B. cryptarum and B. magnus, B. lucorum worker activity was skewed toward warmer, sunnier conditions, leading to interspecific temporal variation. Furthermore, the three species differentially exploited the available forage plants: In particular, unlike the other two species, B. magnus fed predominantly on species of heather. The results suggest that ecological divergence in different niche dimensions and spatio-temporal heterogeneity in the environment may contribute to the persistence of cryptic species in sympatry. Furthermore, our study suggests that cryptic species provide distinct

  2. Ratchet Effects, Negative Mobility, and Phase Locking for Skyrmions on Periodic Substrates

    NASA Astrophysics Data System (ADS)

    Reichhardt, Charles; Ray, Dipanjan; Olson Reichhardt, Cynthia

    We examine the dynamics of skyrmions interacting with 1D and 2D periodic substrates in the presence of dc and ac drives. We find that the Magnus term strongly affects the skyrmion dynamics and that new kinds of phenomena can occur which are absent for overdamped ac and dc driven particles interacting with similar substrates. We show that it is possible to realize a Magnus induced ratchet for skyrmions interacting with an asymmetric potential, where the application of an ac drive can produce quantized dc motion of the skyrmions even when the ac force is perpendicular to the substrate asymmetry direction. For symmetric substrates it is also possible to achieve a negative mobility effect where the net skyrmion motion runs counter to an applied dc drive. Here, as a function of increasing dc drive, the velocity-force curves show a series of locking phases that have different features from the classic Shapiro steps found in overdamped systems. In the phase locking and ratcheting states, the skyrmions undergo intricate 2D orbits induced by the Magnus term.

  3. STS-112 Crew Training Clip

    NASA Technical Reports Server (NTRS)

    2002-01-01

    Footage shows the crew of STS-112 (Jeffrey Ashby, Commander; Pamela Melroy, Pilot; David Wolf, Piers Sellers, Sandra Magnus, and Fyodor Yurchikhin, Mission Specialists) during several parts of their training. The video is arranged into short segments. In 'Topside Activities at the NBL', Wolf and Sellers are fitted with EVA suits for pool training. 'Pre-Launch Bailout Training in CCT II' shows all six crew members exiting from the hatch on a model of a shuttle orbiter cockpit. 'EVA Training in the VR Lab' shows a crew member training with a virtual reality simulator, interspersed with footage of Magnus, and Wolf with Melroy, at monitors. There is a 'Crew Photo Session', and 'Pam Melroy and Sandy Magnus at the SES Dome' also features a virtual reality simulator. The final two segments of the video involve hands-on training. 'Post Landing Egress at the FFT' shows the crew suiting up into their flight suits, and being raised on a harness, to practice rapelling from the cockpit hatch. 'EVA Prep and Post at the ISS Airlock' shows the crew assembling an empty EVA suit onboard a model of a module. The crew tests oxygen masks, and Sellers is shown on an exercise bicycle with an oxygen mask, with his heart rate monitored (not shown).

  4. Anatomy of the septomarginal trabecula in goat hearts.

    PubMed

    Leão, Camila Ribeiro; Pacha, Diego Lago; Cyriaco, Thiago; da Silva, Cavalcante; Wafae, Nader; Pereira, Heloisa Maria Lemes; Ruiz, Cristiane Regina

    2010-01-01

    Our aim in this study was to examine the right septomarginal trabecula of goats regarding the frequency, origin course of the septal and free component, attachment to the papillaris magnus muscle and size . The material used consisted in 32 hearts from non-pedigree goats of both sexes, preserved in 10% formalin. The right septomarginal trabecula was present in all hearts. It could also present a prominence in the form of a cord in the septum before detaching and going towards the wall or the papillary muscle. We called this a septal component and found it in 69% of all hearts studied. In the remaining specimens, the exit of the septomarginal trabecula was abrupt, without presenting a septal component. It could be attached solely to the papillaris magnus muscle or to the papillary muscle and the ventricle wall, originated in the cranial third of the septum, and was attached to the middle third of the papillary muscle or its caudal third. Its free part, from the septum to the papillaris magnus muscle, ranged in length from 1.3 cm to 2.6 cm. The mean value was 1.7 cm, and the most frequent values were 1.9 and 1.5 cm. In conclusion, in goats, the septomarginal trabecula is a constant and invariable structure.

  5. Reactive high power impulse magnetron sputtering

    NASA Astrophysics Data System (ADS)

    Gudmundsson, J. T.; Magnus, F.; Tryggvason, T. K.; Sveinsson, O. B.; Olafsson, S.

    2012-10-01

    Here we discuss reactive high power impulse magnetron sputtering sputtering (HiPIMS) [1] of Ti target in an Ar/N2 and Ar/O2 atmosphere. The discharge current waveform is highly dependent on both the pulse repetition frequency and discharge voltage. The discharge current increases with decreasing frequency or voltage. This we attribute to an increase in the secondary electron emission yield during the self-sputtering phase of the pulse, as nitride [2] or oxide [3] forms on the target. We also discuss the growth of TiN films on SiO2 at temperatures of 22-600 ^oC. The HiPIMS process produces denser films at lower growth temperature and the surface is much smoother and have a significantly lower resistivity than dc magnetron sputtered films on SiO2 at all growth temperatures due to reduced grain boundary scattering [4].[4pt] [1] J. T. Gudmundsson, N. Brenning, D. Lundin and U. Helmersson, J. Vac. Sci. Technol. A, 30 030801 (2012)[0pt] [2] F. Magnus, O. B. Sveinsson, S. Olafsson and J. T. Gudmundsson, J. Appl. Phys., 110 083306 (2011)[0pt] [3] F. Magnus, T. K. Tryggvason, S. Olafsson and J. T. Gudmundsson, J. Vac. Sci. Technol., submitted 2012[0pt] [4] F. Magnus, A. S. Ingason, S. Olafsson and J. T. Gudmundsson, IEEE Elec. Dev. Lett., accepted 2012

  6. STS-112 Crew Training Clip

    NASA Technical Reports Server (NTRS)

    2002-01-01

    Footage shows the crew of STS-112 (Jeffrey Ashby, Commander; Pamela Melroy, Pilot; David Wolf, Piers Sellers, Sandra Magnus, and Fyodor Yurchikhin, Mission Specialists) during several parts of their training. The video is arranged into short segments. In 'Topside Activities at the NBL', Wolf and Sellers are fitted with EVA suits for pool training. 'Pre-Launch Bailout Training in CCT II' shows all six crew members exiting from the hatch on a model of a shuttle orbiter cockpit. 'EVA Training in the VR Lab' shows a crew member training with a virtual reality simulator, interspersed with footage of Magnus, and Wolf with Melroy, at monitors. There is a 'Crew Photo Session', and 'Pam Melroy and Sandy Magnus at the SES Dome' also features a virtual reality simulator. The final two segments of the video involve hands-on training. 'Post Landing Egress at the FFT' shows the crew suiting up into their flight suits, and being raised on a harness, to practice rapelling from the cockpit hatch. 'EVA Prep and Post at the ISS Airlock' shows the crew assembling an empty EVA suit onboard a model of a module. The crew tests oxygen masks, and Sellers is shown on an exercise bicycle with an oxygen mask, with his heart rate monitored (not shown).

  7. Two new species of the deep-sea genus Parameiropsis (Copepoda: Harpacticoida) from the eastern central Pacific.

    PubMed

    Cho, Dae Hyun; Wi, Jin Hee; Suh, Hae-Lip

    2016-07-01

    Two new species of Parameiropsis are herein described that were identified from the Korean Deep Ocean Study (KODOS) in the Clarion-Clipperton Fracture Zone, located in the eastern central Pacific. Parameiropsis kodosensis n. sp. is similar to P. magnus Itô, 1983 in two key respects: the presence of a distal seta on the syncoxa of the maxilliped, and the general features of its swimming legs. However, P. kodosensis can be differentiated from P. magnus by a higher length-to-width ratio of the caudal ramus (2.5:1 and 1:1 respectively), the setal number on the exp-3 of P1, and the exp and benp of P5 are separated in P. kodosensis, while they are fused in P. magnus. Parameiropsis tetraspinosa n. sp. resembles P. peruanus Becker, 1974 in the absence of a fused seta in the outermost spine on the endopod of antenna and the general features of the swimming legs. However, P. tetraspinosa can be distinguished from P. peruanus by a higher length-to-width ratio of the caudal ramus (3.9:1 and 2.3:1 respectively), the presence of a distal seta on the syncoxa of the maxilliped, and by its medially fused P5. In this study full descriptions and a comparison with previously described species are provided. Additionally, a key to females of Parameiropsis species is given.

  8. STS-112 Crew Training Clip

    NASA Astrophysics Data System (ADS)

    2002-09-01

    Footage shows the crew of STS-112 (Jeffrey Ashby, Commander; Pamela Melroy, Pilot; David Wolf, Piers Sellers, Sandra Magnus, and Fyodor Yurchikhin, Mission Specialists) during several parts of their training. The video is arranged into short segments. In 'Topside Activities at the NBL', Wolf and Sellers are fitted with EVA suits for pool training. 'Pre-Launch Bailout Training in CCT II' shows all six crew members exiting from the hatch on a model of a shuttle orbiter cockpit. 'EVA Training in the VR Lab' shows a crew member training with a virtual reality simulator, interspersed with footage of Magnus, and Wolf with Melroy, at monitors. There is a 'Crew Photo Session', and 'Pam Melroy and Sandy Magnus at the SES Dome' also features a virtual reality simulator. The final two segments of the video involve hands-on training. 'Post Landing Egress at the FFT' shows the crew suiting up into their flight suits, and being raised on a harness, to practice rapelling from the cockpit hatch. 'EVA Prep and Post at the ISS Airlock' shows the crew assembling an empty EVA suit onboard a model of a module. The crew tests oxygen masks, and Sellers is shown on an exercise bicycle with an oxygen mask, with his heart rate monitored (not shown).

  9. Solution of the coupled-channel schrödinger equation using constant, linear and quadratic reference potentials

    NASA Astrophysics Data System (ADS)

    Mattson, Timothy G.; Anderson, Roger W.

    Systems of coupled second order differential equations arise in many problems in molecular quantum physics. In this paper we investigate approximate potential methods that solve these differential equations. A series method for the evaluation of the propagators is developed for the multichannel Schrödinger equation where the reference potential is expressed as a polynomial. The case of a linear approximate potential is treated in detail and the results are compared with the Magnus and Bessel methods which approximate the potential as a constant in each interval. The importance of fitting the potentials at the zeroes of a Legendre polynomial is shown. Optimum fitting of the potential results in second and fourth order global convergence respectively for constant and linear fits. Richardson extrapolation is used to increase the accuracy of the low order methods. Explicit formulae are presented for the first order perturbative corrections to the Magnus propagators. The importance of adding the leading terms in the second order perturbative correction to the first order corrections is shown. Useful formulae are derived from the perturbation analysis to guide variable step size determination. A simple series correction is also presented to improve the accuracy of the Magnus method. The application of the various propagators to the two channel Olson-Smith problem show that the Bessel propagators are the most efficient for moderate accuracy (> 10-3 root mean square fractional error in inelastic differential cross sections) calculations. The first order perturbatively corrected Magnus method (with leading second order terms) is the most efficient for higher accuracy calculations. The zeroth order Gordon methods, where the potential in an interval is assumed to be diagonal with linear or quadratic elements, are less efficient than the simple Magnus method. The methods developed in this paper are compared with the log derivative method and the most efficient of ovr methods

  10. ConnesFusionTensorProduct/Photon GluonFusion in Mitochondria

    NASA Astrophysics Data System (ADS)

    Wh-Maksoed, Prodi Of Physics Ui, Depok 16415-Indonesia; Ssi, Wh-Maksoed

    2016-05-01

    As in AJ Wassermann distinguished of classical invariant theory & quantum invariant theory subfactor, in S. Palcoux:``From Neveu-Schwarz Subfactors & Connes Fusion'' described the subfactor theory & Witt-algebra whereas Andreas Thom's explanation about ConnesFusionTensorProduct/CFTP related Connes fusion to composition of homomorphism (i). classical tensor product O-X adds the changes,(ii). Relative tensor product H-X preserve the changes. For photonGluonFusion/PGF defined:''photon is the gauge boson of QED, the simplest of all boson'' devotes to CFT as ``quantum field theory which are invariant under conformal transformation & in 2D there are infinite dimensional algebra. Alain Connes states theirselves Connes fusion as ``associative tensor operation'' to be in coincidences with ``their dynamic behavior driven by the balance in mitochondrial fusion & fission (Carveney, 2007) from Peter Alexander Williams: ``Retinal neuronal remodeling in a model of Optic Atrophy'', Dec, 2011. Great acknowledged to the VicePresident of the R.I, HE.Mr. Drs. M. JUSUF KALLA.

  11. Carbon dioxide free production of hydrogen

    NASA Astrophysics Data System (ADS)

    Stoppel, L.; Fehling, T.; Geißler, T.; Baake, E.; Wetzel, T.

    2017-07-01

    The present report summarizes the theoretical modelling and experimental investigation results of the study on the direct thermal methane cracking. This work is a part of the LIMTECH-Project (Liquid Metal Technologies) funded of Helmholtz Alliance and was carried out from 2012 to 2017. The Project-part B5 “CO2-free production of hydrogen” focused on experimental testing and particularly on modelling the novel methane cracking method based on liquid metal technology. The new method uses a bubble column reactor, filled with liquid metal, where both the chemical reaction of methane decomposition and the separation of gas fraction from solid carbon occur. Such reactor system was designed and built in the liquid metal laboratory (KALLA) at KIT. The influences of liquid metal temperature distribution in reactor and feed gas flow rate on methane conversion ratio were investigated experimentally at the temperature range from 930°C to 1175 °C and methane flow rate at the reactor inlet from 50 to 200 mLn/min. In parallel with experimental investigations, a thermochemical model, giving insight in the influence of the above mentioned parameters has been developed at KIT and a CFD model was developed at LUH to get an overview about the bubble dynamics in the reaction system. The influence of different bubble sizes and shapes, multi-inlet coalescence effects as well as the potential of electromagnetic stirring have been investigated.

  12. Investigation on heavy liquid metal cooling of ADS fuel pin assemblies

    NASA Astrophysics Data System (ADS)

    Litfin, K.; Batta, A.; Class, A. G.; Wetzel, Th.; Stieglitz, R.

    2011-08-01

    In the framework of accelerator driven sub-critical reactor systems heavy liquid metals are considered as coolant for the reactor core and the spallation target. In particular lead or lead bismuth eutectic (LBE) exhibit efficient heat removal properties and high production rate of neutrons. However, the excellent heat conductivity of LBE-flows expressed by a low molecular Prandtl number of the order 10 -2 requires improved modeling of the turbulent heat transfer. Although various models for thermal hydraulics of LBE flows are existing, validated heat transfer correlations for ADS-relevant conditions are still missing. In order to validate the sub-channel codes and computational fluid dynamics codes used to design fuel assemblies, the comparison with experimental data is inevitable. Therefore, an experimental program composed of three major experiments, a single electrically heated rod, a 19-pin hexagonal water rod bundle and a LBE rod bundle, has been initiated at the Karlsruhe Liquid metal Laboratory (KALLA) of the Karlsruhe Institute of Technology, in order to quantify and separate the individual phenomena occurring in the momentum and energy transfer of a fuel assembly.

  13. Quantized transport for a skyrmion moving on a two-dimensional periodic substrate

    NASA Astrophysics Data System (ADS)

    Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

    2015-03-01

    We examine the dynamics of a skyrmion moving over a two-dimensional periodic substrate utilizing simulations of a particle-based skyrmion model. We specifically examine the role of the nondissipative Magnus term on the driven motion and the resulting skyrmion velocity-force curves. In the overdamped limit, there is a depinning transition into a sliding state in which the skyrmion moves in the same direction as the external drive. When there is a finite Magnus component in the equation of motion, a skyrmion in the absence of a substrate moves at an angle with respect to the direction of the external driving force. When a periodic substrate is added, the direction of motion or Hall angle of the skyrmion is dependent on the amplitude of the external drive, only approaching the substrate-free limit for higher drives. Due to the underlying symmetry of the substrate the direction of skyrmion motion does not change continuously as a function of drive, but rather forms a series of discrete steps corresponding to integer or rational ratios of the velocity components perpendicular ( ) and parallel ( ) to the external drive direction: / =n /m , where n and m are integers. The skyrmion passes through a series of directional locking phases in which the motion is locked to certain symmetry directions of the substrate for fixed intervals of the drive amplitude. Within a given directionally locked phase, the Hall angle remains constant and the skyrmion moves in an orderly fashion through the sample. Signatures of the transitions into and out of these locked phases take the form of pronounced cusps in the skyrmion velocity versus force curves, as well as regions of negative differential mobility in which the net skyrmion velocity decreases with increasing external driving force. The number of steps in the transport curve increases when the relative strength of the Magnus term is increased. We also observe an overshoot phenomena in the directional locking

  14. Phylogeny and species delineation in European species of the genus Steganacarus (Acari, Oribatida) using mitochondrial and nuclear markers.

    PubMed

    Kreipe, Victoria; Corral-Hernández, Elena; Scheu, Stefan; Schaefer, Ina; Maraun, Mark

    2015-06-01

    Species of the genus Steganacarus are soil-living oribatid mites (Acari, Phthiracaridae) with a ptychoid body. The phylogeny and species status of the species of Steganacarus are not resolved, some authors group all ten German species of Steganacarus within the genus Steganacarus whereas others split them into three subgenera, Steganacarus, Tropacarus and Atropacarus. Additionally, two species, S. magnus and T. carinatus, comprise morphotypes of questionable species status. We investigated the phylogeny and species status of ten European Steganacarus species, i.e. S. applicatus, S. herculeanus, S. magnus forma magna, S. magnus forma anomala, S. spinosus, Tropacarus brevipilus, T. carinatus forma carinata, T. carinatus forma pulcherrima, Atropacarus striculus and Rhacaplacarus ortizi. We used two molecular markers, a 251 bp fragment of the nuclear gene 28S rDNA (D3) and a 477 bp fragment of the mitochondrial COI region. The phylogeny based on a combined analysis of D3 and COI separated four subgenera (Steganacarus, Tropacarus and Atropacarus, Rhacaplacarus) indicating that they form monophyletic groups. The COI region separated all ten species of the genus Steganacarus and showed variation within some species often correlating with the geographic origin of the species. Resolution of the more conserved D3 region was limited, indicating that radiation events are rather recent. Overall, our results indicate that both genes alone cannot be used for phylogeny and barcoding since variation is too low in D3 and too high in COI. However, when used in combination these genes provide reliable insight into the phylogeny, radiation and species status of taxa of the genus Steganacarus.

  15. Yeast biogeography and the effects of species recognition approaches: the case study of widespread basidiomycetous species from birch forests in Russia.

    PubMed

    Yurkov, Andrey; Inácio, João; Chernov, Ivan Yu; Fonseca, Álvaro

    2015-04-01

    Understanding diversity and distribution patterns of fungi, including yeasts, ultimately depends on accuracy of species recognition. However, different approaches to yeast species recognition often result in different entities or operational taxonomic units. We studied the effects of using different yeast species recognition approaches, namely morphological species recognition (MSR) and phylogenetic species recognition (PSR), on the distribution patterns of widespread basidiomycetous yeasts. Hence, we have revised a collection of yeast fungi isolated from spatially remote birch forests in the Moscow Region and Western Siberia with molecular typing and identification tools. PCR fingerprinting and rDNA sequencing analyses of strains of nine species previously identified on the basis of morphological and physiological tests (MSR) yielded 21 phylogenetic species (PSR), including three currently undescribed taxa. The number of distinct phylogenetic species comprised within a single morphospecies ranged from one to seven. A total of ten species were found in both regions, whereas the distribution of 11 yeasts was restricted to a single region only. Both geographical region and type of substrate (plant or soil) influence yeast distribution. Cryptococcus wieringae, C. victoriae, C. magnus, and Leucosporidium scottii were frequently found on plant substrates, whereas C. terricola and C. podzolicus were associated to soil substrates. Occurrence of C. magnus, C. albidus and Sporobolomyces roseus was found to depend on the geographical region. Microsatellite-PCR fingerprinting, MSP-PCR, applied to studying yeast intraspecific variability revealed three different types of distribution: (a) variability that depends on geographical factors (Curvibasidium cygneicollum, C. podzolicus, C. victoriae), (b) genetic identity irrespectively of the region of isolation (Rhodotorula pinicola, C. terricola), and (c) high degree of genetic variability that did not correlate with region of

  16. Enstrophy-based proper orthogonal decomposition of flow past rotating cylinder at super-critical rotating rate

    NASA Astrophysics Data System (ADS)

    Sengupta, Tapan K.; Gullapalli, Atchyut

    2016-11-01

    Spinning cylinder rotating about its axis experiences a transverse force/lift, an account of this basic aerodynamic phenomenon is known as the Robins-Magnus effect in text books. Prandtl studied this flow by an inviscid irrotational model and postulated an upper limit of the lift experienced by the cylinder for a critical rotation rate. This non-dimensional rate is the ratio of oncoming free stream speed and the surface speed due to rotation. Prandtl predicted a maximum lift coefficient as CLmax = 4π for the critical rotation rate of two. In recent times, evidences show the violation of this upper limit, as in the experiments of Tokumaru and Dimotakis ["The lift of a cylinder executing rotary motions in a uniform flow," J. Fluid Mech. 255, 1-10 (1993)] and in the computed solution in Sengupta et al. ["Temporal flow instability for Magnus-robins effect at high rotation rates," J. Fluids Struct. 17, 941-953 (2003)]. In the latter reference, this was explained as the temporal instability affecting the flow at higher Reynolds number and rotation rates (>2). Here, we analyze the flow past a rotating cylinder at a super-critical rotation rate (=2.5) by the enstrophy-based proper orthogonal decomposition (POD) of direct simulation results. POD identifies the most energetic modes and helps flow field reconstruction by reduced number of modes. One of the motivations for the present study is to explain the shedding of puffs of vortices at low Reynolds number (Re = 60), for the high rotation rate, due to an instability originating in the vicinity of the cylinder, using the computed Navier-Stokes equation (NSE) from t = 0 to t = 300 following an impulsive start. This instability is also explained through the disturbance mechanical energy equation, which has been established earlier in Sengupta et al. ["Temporal flow instability for Magnus-robins effect at high rotation rates," J. Fluids Struct. 17, 941-953 (2003)].

  17. EMG of the hip adductor muscles in six clinical examination tests.

    PubMed

    Lovell, Gregory A; Blanch, Peter D; Barnes, Christopher J

    2012-08-01

    To assess activation of muscles of hip adduction using EMG and force analysis during standard clinical tests, and compare athletes with and without a prior history of groin pain. Controlled laboratory study. 21 male athletes from an elite junior soccer program. Bilateral surface EMG recordings of the adductor magnus, adductor longus, gracilis and pectineus as well as a unilateral fine-wire EMG of the pectineus were made during isometric holds in six clinical examination tests. A load cell was used to measure force data. Test type was a significant factor in the EMG output for all four muscles (all muscles p < 0.01). EMG activation was highest in Hips 0 or Hips 45 for adductor magnus, adductor longus and gracilis. EMG activation for pectineus was highest in Hips 90. Injury history was a significant factor in the EMG output for the adductor longus (p < 0.05), pectineus (p < 0.01) and gracilis (p < 0.01) but not adductor magnus. For force data, clinical test type was a significant factor (p < 0.01) with Hips 0 being significantly stronger than Hips 45, Hips 90 and Side lay. BMI (body mass index) was a significant factor (p < 0.01) for producing a higher force. All other factors had no significant effect on the force outputs. Hip adduction strength assessment is best measured at hips 0 (which produced most force) or 45° flexion (which generally gave the highest EMG output). Muscle EMG varied significantly with clinical test position. Athletes with previous groin injury had a significant fall in some EMG outputs. Copyright © 2011 Elsevier Ltd. All rights reserved.

  18. Advances in Theory of Solid-State Nuclear Magnetic Resonance

    PubMed Central

    Mananga, Eugene S.; Moghaddasi, Jalil; Sana, Ajaz; Akinmoladun, Andrew; Sadoqi, Mostafa

    2015-01-01

    Recent advances in theory of solid state nuclear magnetic resonance (NMR) such as Floquet-Magnus expansion and Fer expansion, address alternative methods for solving a time-dependent linear differential equation which is a central problem in quantum physics in general and solid-state NMR in particular. The power and the salient features of these theoretical approaches that are helpful to describe the time evolution of the spin system at all times are presented. This review article presents a broad view of manipulations of spin systems in solid-state NMR, based on milestones theories including the average Hamiltonian theory and the Floquet theory, and the approaches currently developing such as the Floquet-Magnus expansion and the Fer expansion. All these approaches provide procedures to control and describe the spin dynamics in solid-state NMR. Applications of these theoretical methods to stroboscopic and synchronized manipulations, non-synchronized experiments, multiple incommensurated frequencies, magic-angle spinning samples, are illustrated. We also reviewed the propagators of these theories and discussed their convergences. Note that the FME is an extension of the popular Magnus Expansion and Average Hamiltonian Theory. It aims is to bridge the AHT to the Floquet Theorem but in a more concise and efficient formalism. Calculations can then be performed in a finite-dimensional Hilbert space instead of an infinite dimensional space within the so-called Floquet theory. We expected that the FME will provide means for more accurate and efficient spin dynamics simulation and for devising new RF pulse sequence. PMID:26878063

  19. High-intensity flywheel exercise and recovery of atrophy after 90 days bed--rest.

    PubMed

    Belavý, Daniel L; Ohshima, Hiroshi; Rittweger, Jörn; Felsenberg, Dieter

    2017-01-01

    To investigate differential muscle atrophy during bed-rest, the impact of a high-intensity concentric-eccentric (flywheel) resistance exercise countermeasure and muscle recovery after bed-rest. Twenty-five healthy male subjects underwent 90 dayshead-down tilt bed-rest. Volume of individual lower-limb muscles was measured via MRI before, twice during and four times up to 1 year after bed-rest. Subjects were either inactive (n=16) or performed flywheel exercise every third day of bed-rest (n=9). Functional performance was assessed via countermovement jump. On 'intent-to-treat' analysis, flywheel prevented atrophy in the vasti (p<0.001) and reduced atrophy in the hip adductor/extensor adductor magnus (p=0.001) and ankle dorsiflexors/toe flexors (soleus (p<0.001), gastrocnemius medialis (p<0.001), gastrocnemius lateralis (p=0.02), and tibialis posterior with flexor digitorum longus (p=0.04)). Flywheel exercise was not effective for the hamstrings, gracilis, sartorius, peroneals and anterior tibial muscles. Muscle atrophy in vasti, soleus, gastrocnemius medialis, gastrocnemius lateralis and adductor magnus correlated with losses in countermovement jump performance. Muscle volume recovered within 90 days after bed-rest, however long-term after bed-rest, the inactive subjects only showed significantly increased muscle volume versus prebed-rest in a number of muscles including soleus (+4.3%), gastrocnemius medialis (+3.9%) and semimembranosus (+4.3%). This was not associated with greater countermovement jump performance. The exercise countermeasure was effective in preventing or reducing atrophy in the vasti, adductor magnus and ankle dorsiflexors/toe flexors but not the hamstrings, medial thigh muscles or peroneals and dorsiflexor muscles. NCT00311571; results.

  20. High-intensity flywheel exercise and recovery of atrophy after 90 days bed-­rest­

    PubMed Central

    Ohshima, Hiroshi; Rittweger, Jörn; Felsenberg, Dieter

    2017-01-01

    Aims To investigate differential muscle atrophy during bed-rest, the impact of a high-intensity concentric-eccentric (flywheel) resistance exercise countermeasure and muscle recovery after bed-rest. Methods Twenty-five healthy male subjects underwent 90 dayshead-down tilt bed-rest. Volume of individual lower-limb muscles was measured via MRI before, twice during and four times up to 1 year after bed-rest. Subjects were either inactive (n=16) or performed flywheel exercise every third day of bed-rest (n=9). Functional performance was assessed via countermovement jump. Results On ‘intent-to-treat’ analysis, flywheel prevented atrophy in the vasti (p<0.001) and reduced atrophy in the hip adductor/extensor adductor magnus (p=0.001) and ankle dorsiflexors/toe flexors (soleus (p<0.001), gastrocnemius medialis (p<0.001), gastrocnemius lateralis (p=0.02), and tibialis posterior with flexor digitorum longus (p=0.04)). Flywheel exercise was not effective for the hamstrings, gracilis, sartorius, peroneals and anterior tibial muscles. Muscle atrophy in vasti, soleus, gastrocnemius medialis, gastrocnemius lateralis and adductor magnus correlated with losses in countermovement jump performance. Muscle volume recovered within 90 days after bed-rest, however long-term after bed-rest, the inactive subjects only showed significantly increased muscle volume versus prebed-rest in a number of muscles including soleus (+4.3%), gastrocnemius medialis (+3.9%) and semimembranosus (+4.3%). This was not associated with greater countermovement jump performance. Conclusion The exercise countermeasure was effective in preventing or reducing atrophy in the vasti, adductor magnus and ankle dorsiflexors/toe flexors but not the hamstrings, medial thigh muscles or peroneals and dorsiflexor muscles. Trial registration number NCT00311571; results. PMID:28761699

  1. Advances in Theory of Solid-State Nuclear Magnetic Resonance.

    PubMed

    Mananga, Eugene S; Moghaddasi, Jalil; Sana, Ajaz; Akinmoladun, Andrew; Sadoqi, Mostafa

    Recent advances in theory of solid state nuclear magnetic resonance (NMR) such as Floquet-Magnus expansion and Fer expansion, address alternative methods for solving a time-dependent linear differential equation which is a central problem in quantum physics in general and solid-state NMR in particular. The power and the salient features of these theoretical approaches that are helpful to describe the time evolution of the spin system at all times are presented. This review article presents a broad view of manipulations of spin systems in solid-state NMR, based on milestones theories including the average Hamiltonian theory and the Floquet theory, and the approaches currently developing such as the Floquet-Magnus expansion and the Fer expansion. All these approaches provide procedures to control and describe the spin dynamics in solid-state NMR. Applications of these theoretical methods to stroboscopic and synchronized manipulations, non-synchronized experiments, multiple incommensurated frequencies, magic-angle spinning samples, are illustrated. We also reviewed the propagators of these theories and discussed their convergences. Note that the FME is an extension of the popular Magnus Expansion and Average Hamiltonian Theory. It aims is to bridge the AHT to the Floquet Theorem but in a more concise and efficient formalism. Calculations can then be performed in a finite-dimensional Hilbert space instead of an infinite dimensional space within the so-called Floquet theory. We expected that the FME will provide means for more accurate and efficient spin dynamics simulation and for devising new RF pulse sequence.

  2. Bioactive Mimetics of Conotoxins and other Venom Peptides

    PubMed Central

    Duggan, Peter J.; Tuck, Kellie L.

    2015-01-01

    Ziconotide (Prialt®), a synthetic version of the peptide ω-conotoxin MVIIA found in the venom of a fish-hunting marine cone snail Conus magnus, is one of very few drugs effective in the treatment of intractable chronic pain. However, its intrathecal mode of delivery and narrow therapeutic window cause complications for patients. This review will summarize progress in the development of small molecule, non-peptidic mimics of Conotoxins and a small number of other venom peptides. This will include a description of how some of the initially designed mimics have been modified to improve their drug-like properties. PMID:26501323

  3. Quasi-Periodically Driven Quantum Systems

    NASA Astrophysics Data System (ADS)

    Verdeny, Albert; Puig, Joaquim; Mintert, Florian

    2016-10-01

    Floquet theory provides rigorous foundations for the theory of periodically driven quantum systems. In the case of non-periodic driving, however, the situation is not so well understood. Here, we provide a critical review of the theoretical framework developed for quasi-periodically driven quantum systems. Although the theoretical footing is still under development, we argue that quasi-periodically driven quantum systems can be treated with generalisations of Floquet theory in suitable parameter regimes. Moreover, we provide a generalisation of the Floquet-Magnus expansion and argue that quasi-periodic driving offers a promising route for quantum simulations.

  4. Rigorous Bound on Energy Absorption and Generic Relaxation in Periodically Driven Quantum Systems

    NASA Astrophysics Data System (ADS)

    Mori, Takashi; Kuwahara, Tomotaka; Saito, Keiji

    2016-03-01

    We discuss the universal nature of relaxation in isolated many-body quantum systems subjected to global and strong periodic driving. Our rigorous Floquet analysis shows that the energy of the system remains almost constant up to an exponentially long time in frequency for arbitrary initial states and that an effective Hamiltonian obtained by a truncation of the Floquet-Magnus expansion is a quasiconserved quantity in a long time scale. These two general properties lead to an intriguing classification on the initial stage of relaxation, one of which is similar to the prethermalization phenomenon in nearly integrable systems.

  5. Kato expansion in quantum canonical perturbation theory

    NASA Astrophysics Data System (ADS)

    Nikolaev, Andrey

    2016-06-01

    This work establishes a connection between canonical perturbation series in quantum mechanics and a Kato expansion for the resolvent of the Liouville superoperator. Our approach leads to an explicit expression for a generator of a block-diagonalizing Dyson's ordered exponential in arbitrary perturbation order. Unitary intertwining of perturbed and unperturbed averaging superprojectors allows for a description of ambiguities in the generator and block-diagonalized Hamiltonian. We compare the efficiency of the corresponding computational algorithm with the efficiencies of the Van Vleck and Magnus methods for high perturbative orders.

  6. STS_135_FDF

    NASA Image and Video Library

    2011-06-24

    JSC2011-E-059611 (24 June 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, leans out around pilot Doug Hurley, left, to confer with commander Chris Ferguson (out of frame) as the crew of the final space shuttle mission participates in the STS-135 Flight Data File (FDF) review at NASA?s Johnson Space Center June 24, 2011. The review involves examining and annotating more than 200 procedure books and cue cards that comprise all of the detailed technical steps that will be performed during the mission. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  7. Analysis of NMR self-diffusion measurements by a density matrix calculation

    NASA Astrophysics Data System (ADS)

    Stepišnik, J.

    1981-04-01

    The density matrix formalism with the Magnus expansion of the time evolution operator is used to study the nmr response in a pulsed magnetic field gradient (mfg) spin-echo experiment. The results show that the spin-echo cannot only measure the self-diffusion coefficient but can determine the spectrum of the single-particle velocity autocorrelation function as well. The proper combination of rf and mfg pulse sequences are proposed for measuring self-diffusion in spin systems with strong dipolar coupling where the classical method fails.

  8. STS-112 Flight Day 7 Highlights

    NASA Technical Reports Server (NTRS)

    2002-01-01

    On this seventh day of STS-112 mission members of the crew (Commander Jeff Ashby; Pilot Pam Melroy; Mission Specialist Sandy Magnus, Piers Sellers, Dave Wolf, and Fyodor Yurchikhin) along with the Expedition Five crew (Commander Valery Korzun; Flight Engineer Peggy Whitson, and Sergei Treschev) are seen answering questions during the mission's press interview and photo opportunity. They answered various questions regarding the mission's objectives, the onboard science experiments, the extravehicular activities (EVAs) and the effects of living in space. Shots of the test deployment of the S1 truss radiator and Canadarm rotor joint are also shown.

  9. STS-112 Flight Day 7 Highlights

    NASA Astrophysics Data System (ADS)

    2002-10-01

    On this seventh day of STS-112 mission members of the crew (Commander Jeff Ashby; Pilot Pam Melroy; Mission Specialist Sandy Magnus, Piers Sellers, Dave Wolf, and Fyodor Yurchikhin) along with the Expedition Five crew (Commander Valery Korzun; Flight Engineer Peggy Whitson, and Sergei Treschev) are seen answering questions during the mission's press interview and photo opportunity. They answered various questions regarding the mission's objectives, the onboard science experiments, the extravehicular activities (EVAs) and the effects of living in space. Shots of the test deployment of the S1 truss radiator and Canadarm rotor joint are also shown.

  10. Vortex motion in YBCO thin films

    NASA Astrophysics Data System (ADS)

    Shapiro, V.; Verdyan, A.; Lapsker, I.; Azoulay, J.

    1999-09-01

    Hall resistivity measurements as function of temperature in the vicinity of Tc were carried out on a thin films YBCO superconductors. A sign reversal of Hall voltage with external magnetic field applied along c axis have been observed upon crossing Tc. Hall voltage in the mixed state was found to be insensitive to the external magnetic field inversion. These effects are discussed and explained in terms of vortex motion under the influence of Magnus force balanced by large damping force. It is argued that in this model the flux-line velocity has component opposite to the superfluid current direction thus yielding a negative Hall voltage.

  11. Research Laboratory of Electronics Annual Report Number 125.

    DTIC Science & Technology

    1983-01-01

    Hoang, W. Hofmann, M. Isnardi, M.M.A. Khan, E.A. Lee, D.S. Levinstone, J. Lofton, E. Peynard, L. Picard, J. Sara, J-P. Schott, G. Vachon , R.E. Velez...Gentile, Thomas R. 2Lezec, Henri J. Bordley, Thomas E. Giftford, Margaret L.2 Maeda, Marl Briancon, Alain C. Glaser, Michelle 1J.9 Magnus, Margaret...Walter A. Mook, Douglas R. Robinson, Andrew L-8 Vachon , Guy Moser, James R.2 Saxberg, Bror V.H.9 Van Hove, Patrick L 3 Myers, Cory3 Schulert, Andrew j

  12. RLE (Research Laboratory of Electronics) Progress Report Number 125.

    DTIC Science & Technology

    1983-01-01

    Levinstone, J. Lofton, E. Peynard, L. Picard, J. Sara, J-P. Schott, G. Vachon , R.E. Velez 24.1 Picture Coding Donald E. Troxel, William F. Schreiber a...Gifford, Margaret L. Maeda, Marl Briancon, Alain C. Glaser, Michelle J.9 Magnus, Margaret H. Bristol, Jr., Norman’ Glass, James p.7 Malvar, Henrique... Vachon , Guy Moser, James R.2 Saxberg, Bror V.H. 9 Van Hove, Patrick L.13 Myers, Cory3 Schulert, Andrew J. 2 Velez, Richardo E.14 Ocenasek, Josef4

  13. Quantum skyrmions in two-dimensional chiral magnets

    NASA Astrophysics Data System (ADS)

    Takashima, Rina; Ishizuka, Hiroaki; Balents, Leon

    2016-10-01

    We study the quantum mechanics of magnetic skyrmions in the vicinity of the skyrmion-crystal to ferromagnet phase boundary in two-dimensional magnets. We show that the skyrmion excitation has an energy dispersion that splits into multiple bands due to the combination of magnus force and the underlying lattice. Condensation of the skyrmions can give rise to an intermediate phase between the skyrmion crystal and ferromagnet: a quantum liquid, in which skyrmions are not spatially localized. We show that the critical behavior depends on the spin size S and the topological number of the skyrmion. Experimental signatures of quantum skyrmions in inelastic neutron-scattering measurements are also discussed.

  14. Global strings and superfluid vortices

    SciTech Connect

    Davis, R.L. ); Shellard, E.P.S. )

    1989-11-06

    We explain the relationship between global strings of the Abelian Higgs model and vortices in a superfluid. We show that the nonrelativistic Magnus force law for vortices can be derived from global-string dynamics, but only when an external background field has a special Lorentz-noninvariant configuration {ital H}{sup {ital ijk}}{proportional to}{epsilon}{sup ijk}. We present a self-consistent classical theory for relativistic Higgs vortices in a superfluid, and show that superfluid vortices can be described as a system of spinning global strings.

  15. Unfolding of vortices into topological stripes in a multiferroic material.

    PubMed

    Wang, X; Mostovoy, M; Han, M G; Horibe, Y; Aoki, T; Zhu, Y; Cheong, S-W

    2014-06-20

    Multiferroic hexagonal RMnO(3) (R=rare earths) crystals exhibit dense networks of vortex lines at which six domain walls merge. While the domain walls can be readily moved with an applied electric field, the vortex cores so far have been impossible to control. Our experiments demonstrate that shear strain induces a Magnus-type force pulling vortices and antivortices in opposite directions and unfolding them into a topological stripe domain state. We discuss the analogy between this effect and the current-driven dynamics of vortices in superconductors and superfluids.

  16. Mass of a Spin Vortex in a Bose-Einstein Condensate

    SciTech Connect

    Turner, Ari M.

    2009-08-21

    In contrast with charge vortices, spin vortices in a two-dimensional ferromagnetic condensate move inertially (if the condensate has zero magnetization along an axis). The Magnus force, which prevents the inertial motion of the charge vortices, cancels for spin vortices, because they are composed of two oppositely rotating vortices. The inertial mass of spin vortices varies inversely with the strength of spin-dependent interactions and directly with the width of the condensate layer, and can be measured as a part of experiments on how spin vortices orbit one another. For Rb{sup 87} in a 1 mum thick trap, m{sub v}approx10{sup -21} kg.

  17. Motion of a linear vortex singularity

    SciTech Connect

    Kiknadze, L.V.; Mamaladze, Y.G.

    1980-10-01

    A formula is obtained for the velocity of a certain element of a linear vortex in a Bose gas and in helium II in terms of the contribution made to the wave function by the remaining elements of the same wave vortex and of other perturbations of the ground state of the medium. It is shown that, besides the Magnus force, the vortex is acted upon by a force proportional to the condensate-density gradient and directed opposite to the gradient. A generalization is possible to linear vortex singularities of relativistic fields that do not describe any condensed medium at all.

  18. STS_135_ M113

    NASA Image and Video Library

    2011-06-21

    JSC2011-E-059632 (21 June 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, participates in safety training in the M113 personnel carrier during the Terminal Countdown Demonstration Test (TCDT) at NASA?s Kennedy Space Center on June 21, 2011. TCDT serves as the prelaunch countdown rehearsal for the final space shuttle mission, which is scheduled for launch on July 8. The M113 would be used in the event of an emergency at the pad forcing the crew to evacuate. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  19. Vertical distribution of wind-sand interaction forces in aeolian sand transport

    NASA Astrophysics Data System (ADS)

    Kang, Liqiang; Zou, Xueyong

    2011-02-01

    The interaction forces between wind and sand particles are important for particle movement in a blowing sand cloud. These interaction forces include drag force, Magnus force and Saffman force. By using a numerical simulation technique, the vertical distributions of these forces are acquired. The discrete particle model is used to simulate windblown sand movement, in which the gas phase is described by the volume-averaged Navier-Stokes equations, and each particle is directly tracked by solving the particle motion equations considering the inter-particle collisions. In two-dimensional simulations, the wind flow is along the positive direction of the x-coordinate axis, and the height direction is along the positive direction of the y-coordinate axis. The results show that, the mean drag force on a particle in the horizontal direction increases with height, while the total drag force density in each height layer decreases with height. In the positive y and negative y directions, the magnitude of the mean Magnus force on a particle tends to increase with height, while the magnitude of the total Magnus force density decreases with height. The Saffman force mainly occurs in the positive y direction. In this direction, the mean Saffman force on a particle approximates to a constant, except for the region near the sand bed surface, while the total Saffman force density decreases sharply with height below the height of about 3 cm and is close to zero above the height of about 3 cm. In the positive and negative y directions, the magnitude of the mean Magnus force on a particle is more than that of the mean Saffman force. The number density of anticlockwise rotational particles approximates to that of the clockwise rotational particles. Above the height of about 3 cm, the number density of anticlockwise and clockwise particles decays exponentially with height. The probability density function of particle angular velocity at different heights can be described as a normal

  20. Vortex dynamics and decay of supercurrent in 2-D superconductors

    SciTech Connect

    Ping Ao

    1992-11-01

    The decay of supercurrent in a 2-d superconductor through the homogeneous quantum nucleation of vortex-antivortex pairs is formulated as a (2 + 1)-d scalar quantum electrodynamic problem. The calculation of the quantum decay rate can then be simplified to the usual single particle WKB calculation. The authors show explicitly that the homogeneous quantum nucleation of vortex-antivortex pairs is incompatible to the existence of the magnus force in the absence of dissipation, and pint out more complicated nucleation processes needed to be studied by the vortex dynamics method in such case. 9 refs.

  1. Dynamics of two-dimensional vortex pairs in a spatially varying potential

    SciTech Connect

    Lee, H.H. ); Gunn, J.M.F. )

    1992-10-01

    We consider the dynamics of vortices in a superfluid {sup 4}He film flowing over a substrate at zero temperature. The vortex trajectories are assumed to be governed by the Magnus-force equation with the effect of the substrate incorporated via the gradient of a potential. We use an equivalent Hamiltonian formulation to show that two vortices in a slowly varying potential can exhibit stochastic behavior. In this regard, there are differences between the cases of two vortices of the same sign and those of the opposite sign, the latter becoming stochastic more readily.

  2. The bacterial flora of the nasal cavity in healthy young men.

    PubMed

    Savolainen, S; Ylikoski, J; Jousimies-Somer, H

    1986-12-01

    The nasal cavity of 97 young healthy men (applicants for the pilot education in the Finnish Air Force) was examined. Bacterial culture demonstrated one or more species of aerobic bacteria in all 194 nasal cavities examined and anaerobic bacteria in 76.5%. In ten per cent of the cultures bacteria were detected after enrichment only. The most common aerobic bacteria were Staphylococcus epidermidis (79%), diphtheroids (41%) and Staphylococcus aureus (34%). Haemophilus influenzae was found in 5% and Streptococcus pneumoniae in 0.5%. Anaerobic culture yielded Propionibacterium acnes in 74.5% and Peptococcus magnus in 3.5%.

  3. Vortex dynamics in self-dual Maxwell-Higgs systems with a uniform background electric charge density

    SciTech Connect

    Lee, K. Institute for Advanced Studies, Olden Lane, Princeton, New Jersey 08540 Institute for Theoretical Physics, University of California at Santa Barbara, Santa Barbara, California 93106 )

    1994-04-15

    We introduce self-dual Maxwell-Higgs systems with a uniform background electric charge density and show that the self-dual equations satisfied by topological vortices can be reduced to the original Bogomol'nyi equations without any background. These vortices are shown to carry no spin but to feel the Magnus force due to the shielding charge carried by the Higgs field. We also study the dynamics of slowly moving vortices and show that the spin-statistics theorem holds to our vortices.

  4. Mass of a spin vortex in a Bose-Einstein condensate.

    PubMed

    Turner, Ari M

    2009-08-21

    In contrast with charge vortices, spin vortices in a two-dimensional ferromagnetic condensate move inertially (if the condensate has zero magnetization along an axis). The Magnus force, which prevents the inertial motion of the charge vortices, cancels for spin vortices, because they are composed of two oppositely rotating vortices. The inertial mass of spin vortices varies inversely with the strength of spin-dependent interactions and directly with the width of the condensate layer, and can be measured as a part of experiments on how spin vortices orbit one another. For Rb87 in a 1 microm thick trap, mv approximately 10(-21) kg.

  5. Generation of ultrasonic waves by ac magnetic fields in the mixed state of high-{ital T}{sub {ital c}} superconductors

    SciTech Connect

    Dominguez, D.; Bulaevskii, L.; Ivlev, B. |; Maley, M.; Bishop, A.R.

    1995-06-01

    We discuss the interaction of a vortex array in a superconductor with sound oscillations, taking into account pinning forces between vortices and crystal displacements. The generation of ultrasound by an ac electromagnetic field acting on the vortex array is considered. We find that at low temperatures and in the linear regime the amplitude of the induced sound wave is proportional to the applied dc magnetic field and independent of pinning strength. We show how the subsequent multiple echo amplitudes allow one to obtain information on the Magnus force and viscosity of the vortex array.

  6. Follow-up investigations of GPHS motion during heat pulse intervals of reentries from gravity-assist trajectories

    SciTech Connect

    Sharbaugh, R.C.

    1992-03-23

    Motion studies of the General Purpose Heat Source Module, GPHS, which were conducted in the heat pulse intervals associated with entries from earth gravity assist trajectories. The APL six-degree-of-freedom reentry program designated TMAGRA6C was used. The objectives of the studies were to (1) determine whether the GPHS module entering the earth's atmosphere from an earth-gravity-assist trajectory has a preferred orientation during the heat pulse of reentry, (2) determine the effect of magnus force on the roll rate and angle of attack of the GPHS during an EGA entry, (3) determine the effect of the magnitude of pitch and roll damping on the GPHS motion.

  7. STS_135_ M113

    NASA Image and Video Library

    2011-06-21

    JSC2011-E-059634 (21 June 2011) --- NASA astronaut Sandy Magnus, STS-135 mission specialist, drives the M113 personnel carrier in a safety training exercise during the Terminal Countdown Demonstration Test (TCDT) at NASA?s Kennedy Space Center June 21, 2011. TCDT serves as the prelaunch countdown rehearsal for the final space shuttle mission, which is scheduled for launch on July 8. The M113 would be used in the event of an emergency at the pad forcing the crew to evacuate. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  8. Semiclassical dynamics of vortices in superfluid helium thin films

    NASA Astrophysics Data System (ADS)

    Li, Xiao; Cheng, Ran; Niu, Qian

    2011-03-01

    Based on the Berry phase theory, we consider the case of two vortices in Bosonic superfluids and try to extract the interaction between them. Under the adiabatic approximation, we use semiclassical Lagrangian formalism to describe the system and found that in addition to the universal background ``magnetic field'' which results in the Magnus force, there exists a new interaction mediated by the density profile of the background fluid due to its finite compressibility. Finally, numerical solutions from the nonlinear Schrodinger equation were employed to gain better insight into this problem.

  9. Transverse force on a quantized vortex in a superfluid

    SciTech Connect

    Thouless, D.J.; Ao, P.; Niu, Q. ||

    1996-05-01

    We have derived an exact expression for the total nondissipative transverse force acting on a quantized vortex moving in a uniform background. The derivation is valid for neutral boson or fermion superfluids, provided the order parameter is a complex scalar quantity. This force is determined by the one-particle density matrix far away from the vortex core, and is found to be the Magnus force proportional to the superfluid density. We conclude that contributions of the localized core states do not change this force. {copyright} {ital 1996 The American Physical Society.}

  10. Toluene alters p75NTR expression in the rat brainstem.

    PubMed

    Pascual, Jesús; Morón, Lena; Zárate, Jon; Gutiérrez, Arantza; Churruca, Itziar; Echevarría, Enrique

    2004-01-01

    Toluene is a neurotoxic organic solvent widely used in industry. Acute toluene administration in rats induced a significant increase in the numbers of neural cells immunostained for p75NTR in several brainstem regions, such as the raphe magnus and the nucleus of the solitary tract, as well as in the lateral reticular, gigantocellular, vestibular and ventral cochlear nuclei, without any in the facial and spinal trigeminal nuclei and the dorsal horn of the spinal cord. These data suggest that p75NTR could be involved in toluene-induced neurotoxic efffects in the rat brainstem.

  11. STS-135 crew during AEM (Animal Enclosure Module) training

    NASA Image and Video Library

    2011-03-25

    JSC2011-E-029136 (25 March 2011) --- STS-135 crew members participate in an Animal Enclosure Module (AEM) training session in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Pictured on the right (foreground) is NASA astronaut Chris Ferguson, commander. Pictured in the background (from the left) are astronauts Doug Hurley (mostly obscured), pilot; Rex Walheim and Sandy Magnus (partially obscured), both mission specialists. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  12. STS-135 crew during AEM (Animal Enclosure Module) training

    NASA Image and Video Library

    2011-03-25

    JSC2011-E-029131 (25 March 2011) --- STS-135 crew members participate in an Animal Enclosure Module (AEM) training session in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Pictured on the right (front to back) are NASA astronauts Chris Ferguson, commander; Sandy Magnus and Rex Walheim, both mission specialists; along with Doug Hurley (left foreground), pilot. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  13. STS-135 crew during AEM (Animal Enclosure Module) training

    NASA Image and Video Library

    2011-03-25

    JSC2011-E-029132 (25 March 2011) --- STS-135 crew members participate in an Animal Enclosure Module (AEM) training session in the Jake Garn Simulation and Training Facility at NASA's Johnson Space Center. Pictured from the left (facing camera) are NASA astronauts Rex Walheim and Sandy Magnus, both mission specialists; and Chris Ferguson, commander; along with Doug Hurley (right foreground), pilot. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

  14. STS-112 Pilot Melroy inspects cables prior to launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. - STS-112 Pilot Pamela Ann Melroy (left) conducts a last-minute inspection of some cables inside Space Shuttle Atlantis at Launch Pad 39B prior to the launch of her mission. The STS-112 crew also includes Commander Jeffrey S. Ashby and Mission Specialists David A. Wolf, Sandra H. Magnus, Piers J. Sellers, and Fyodor N. Yurchikhin of the Russian Space Agency. Launch of the mission was postponed today to no earlier than Thursday, Oct. 3, while weather forecasters and the mission management team assess the possible effect Hurricane Lili may have on the Mission Control Center located at the Lyndon B. Johnson Space Center in Houston, Texas.

  15. STS_135_ MEDIA

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060800 (30 June 2011) --- The STS-135 crew meets with the Johnson Space Center public affairs team before the crew's media briefing at NASA?s Johnson Space Center in Houston on June 30, 2011. The press conference provided the last scheduled opportunity for a large group of press to speak with the crew before the final launch on July 8. Shown, from left, are Rob Navias and James Hartsfield of public affairs, and NASA astronauts Sandy Magnus, Rex Walheim, Chris Ferguson and Doug Hurley. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  16. STS_135_ MEDIA

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060798 (30 June 2011) --- The STS-135 crew, from left, mission specialists Sandy Magnus and Rex Walheim, commander Chris Ferguson and pilot Doug Hurley follow Public Affairs Officer Nicole Cloutier-Lemasters to begin a crew media briefing at NASA?s Johnson Space Center on June 30, 2011. The press conference provided the last scheduled opportunity for a large group of press to speak with the crew before the final launch on July 8. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  17. STS_135_ MEDIA

    NASA Image and Video Library

    2011-06-30

    JSC2011-E-060794 (30 June 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, points to acknowledge a reporter while greeting the media along with NASA astronauts Doug Hurley, pilot, and Sandy Magnus and Rex Walheim, both mission specialists, during the STS-135 crew media briefing at NASA?s Johnson Space Center June 30, 2011. The press conference provided the last scheduled opportunity for a large group of press to speak with the crew before the final launch on July 8. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

  18. Testing the Accuracy of a Projectile Motion Apparatus

    NASA Astrophysics Data System (ADS)

    Henderson, Bret; Martell, Eric

    2013-03-01

    The purpose of this research is to predict where a ball would land given initial velocity, angular velocity, and atmospheric conditions. A spinning spherical object flying through air is affected by gravity, quadratic drag forces, and the Magnus force. Mathematica was used to numerically solve predictions for the equations of motion. These predictions were compared with experimental data gathered by launching tennis balls, baseballs, and/or soccer balls from a machine we designed to propel the balls with a pre-determined initial velocity and initial angular velocity.

  19. Species of the Poaceae-associated genus Bamboosiella (Thysanoptera, Phlaeothripidae) from China, with three new species.

    PubMed

    Dang, Li-Hong; Qiao, Ge-Xia

    2016-11-07

    In the Poaceae-associated genus Bamboosiella Ananthakrishnan, eleven species are here recognized from China, including antennatus sp.n. and longisetis sp.n. from Yunnan, and magnus sp.n. from Hainan. Four species are newly recorded from China, bicoloripes Ananthakrishnan, fasciata Okajima, flavescens Okajima and semiflava Okajima. One species from Zhejiang, Bamboosiella brevibristla Sha, Guo, Feng & Duan is placed as a new synonym of B. exastis (Ananthakrishnan & Kudo). An illustrated identification key is provided to the eleven Bamboosiella species now recognised from China.

  20. Medial circumflex femoral artery flap for ischial pressure sore

    PubMed Central

    Palanivelu, S.

    2009-01-01

    A new axial pattern flap based on the terminal branches of the medial circumflex femoral artery is described for coverage of ischial pressure sore. Based on the terminal branches of the transverse branch of medial circumflex femoral artery, which exit through the gap between the quadratus femoris muscle above and the upper border of adductor magnus muscle below, this fascio cutaneous flap is much smaller than the posterior thigh flap but extremely useful to cover ischeal pressure sores. The skin redundancy below the gluteal fold allows a primary closure of the donor defect. It can also be used in combination with biceps femoris muscle flap. PMID:19881020

  1. Simplified method for evaluating the flight stability of liquid-filled projectiles

    NASA Astrophysics Data System (ADS)

    Weber, Daniel J.

    1994-01-01

    This paper describes a modification to the tricyclic theory to include the effect of a liquid payload on the motion and stability of the projectile. The influence on the projectile's motion by the liquid payload is similar to the Magnus effect. A computer program has been developed that determines the complex projectile motion using either theoretical estimates of liquid-fill characteristics or experimental results obtained from a test fixture for nonrigid payloads. Preliminary stability assessments for liquid-filled projectile can be made rapidly and provide a means of determining the relative importance between the aerodynamic and liquid-fill characteristics on the projectiles flight stability.

  2. Synthese De Diols Copolyesters (Synthesis of Copolyester Diols)

    DTIC Science & Technology

    1979-05-01

    complate de l’acide. On 6vapora les maonomeres r ~ siduels par chauffage sous pressiorl r ~duite. On d~termine le contenu en acide .Esiduel, la...trois monom ~ res , d’un 6ther cyclique, d’un. anhydride de diacide et do l’c-caprolactone. Ces pr6polymares possadent diff6rents substituents is long...Polyuxethane Foams from Lactone Monomer ", U.K. Energy Authority, At Weapons Res . Estab.,. Rept AWRE 0-93-64, 1964. S. Magnus, G., "Poly-e-Caprolactone

  3. Neurophysiology of temperature regulation: problems and perspectives.

    PubMed

    Hellon, R F

    1981-12-01

    The neuronal basis of thermal regulation has been intensively studied. Certain neurons in the hypothalamus and elsewhere are extremely sensitive to changes in local and/or external temperature. Recent in vitro work indicates that membrane potentials rather than synaptic events may be the basis of the local sensitivity. Other central sites outside the central nervous system are also now being recognized as sources of thermal information to the thermoregulatory system. The skin thermal input relays to the nucleus raphe magnus and probably passes from there to the hypothalamus. There is still much uncertainty about how and when the skin and deep thermal receptors provide input to the temperature controller.

  4. Kato expansion in quantum canonical perturbation theory

    SciTech Connect

    Nikolaev, Andrey

    2016-06-15

    This work establishes a connection between canonical perturbation series in quantum mechanics and a Kato expansion for the resolvent of the Liouville superoperator. Our approach leads to an explicit expression for a generator of a block-diagonalizing Dyson’s ordered exponential in arbitrary perturbation order. Unitary intertwining of perturbed and unperturbed averaging superprojectors allows for a description of ambiguities in the generator and block-diagonalized Hamiltonian. We compare the efficiency of the corresponding computational algorithm with the efficiencies of the Van Vleck and Magnus methods for high perturbative orders.

  5. Exploring the Scope of Controlling Quantum Phenomena

    DTIC Science & Technology

    2012-12-12

    known, then HE‐OD can also identify the transition amplitudes of the various  Dyson  expansion  orders contributing to the controlled dynamics. The...robust implementation of a target gate. Comparison of these conditions with those obtained from the Magnus expansion and  Dyson  series shows that

  6. International sexual reform and sexology in Europe, 1897-1933.

    PubMed

    Matte, Nicholas

    2005-01-01

    This paper looks at the relationship of sex reformers and sexology to social reform in Europe in the 20th century prior to the outbreak of World War I. It considers a variety of emerging sexual classification systems and national reform efforts, with special attention to Magnus Hirschfeld and the Institute for Sexual Science in Berlin, which was destroyed by the Nazis in 1933. It argues that during this time period the international connections between individual reformers and sexologists developed into a transnational network that was able, to a certain extent, to protect and encourage the rights of sexual minorities both within and beyond national borders.

  7. Good result after surgical treatment of Pellegrini-Stieda syndrome.

    PubMed

    Theivendran, Kanthan; Lever, Caroline J; Hart, William J

    2009-10-01

    Ossification of the femoral attachment of the medial collateral ligament (MCL) of the knee with associated pain and restricted movements is rare and is characteristic of the Pellegrini-Stieda (PS) syndrome. Although in mild cases conservative treatment is often successful, patients with more significant bone formation and persistent symptoms require surgical excision. We describe a case of PS syndrome with a description of the surgical technique consisting of excision of the bony lesion and reconstruction of the MCL by using the adductor magnus tendon.

  8. Involvement of medullary serotonergic groups in multiple system atrophy.

    PubMed

    Benarroch, Eduardo E; Schmeichel, Ann M; Low, Phillip A; Parisi, Joseph E

    2004-03-01

    We sought to determine whether medullary serotonergic neurons were affected in multiple system atrophy (MSA). Immunostaining for tryptophan hydroxylase was performed on serial 50 microm sections of the medulla of brains obtained at autopsy from six control subjects, eight subjects with clinical diagnosis of MSA, and four with Parkinson's disease. There was a severe depletion of serotonergic neurons in the nucleus raphe magnus, raphe obscurus, raphe pallidus, and ventrolateral medulla in MSA. Depletion of serotonergic neurons may contribute to impaired control of sympathetic outflow and other abnormalities in MSA.

  9. A revision of the Chinese Aulacidae (Hymenoptera, Evanioidea)

    PubMed Central

    Chen, Hua-yan; Turrisi, Giuseppe Fabrizio; Xu, Zai-fu

    2016-01-01

    Abstract The Chinese Aulacidae are revised, keyed and illustrated for the first time. In total twenty-five species are recorded from China, included within two genera Aulacus Jurine, 1807 and Pristaulacus Kieffer, 1900, with five and twenty species respectively. Among the treated species, six are newly described for science: Aulacus magnus sp. n., Pristaulacus calidus sp. n., Pristaulacus centralis sp. n., Pristaulacus fopingi sp. n., Pristaulacus obscurus sp. n., and Pristaulacus pseudoiosephi sp. n. Three species are newly recorded from China: Pristaulacus excisus Turner, 1922, Pristaulacus iosephi Turrisi & Madl, 2013, and Pristaulacus rufobalteatus Cameron, 1907. PMID:27408528

  10. Expedition 28 and STS-135 Crew Members pose for a photo Crew Portrait

    NASA Image and Video Library

    2011-07-16

    ISS028-E-016779 (16 July 2011)--- Inside the Zvezda service module on the International Space Station, space shuttle Atlantis and station crewmembers take a break from an extremely busy work agenda for photos and a social period. Not much time remains for such reunions, as undocking and separation activities are scheduled for a little over 48 hours from the time this photo was made. The STS-135 crew consists of NASA astronauts Chris Ferguson, Doug Hurley, Sandy Magnus and Rex Walheim; the Expedition 28 or station crew members are JAXA astronaut Satoshi Furukawa, NASA astronauts Ron Garan and Mike Fossum, and Russian cosmonauts Andrey Borisenko, Alexander Samokutyaev and Sergei Volkov.

  11. STS-112 crew post-landing briefing for the media

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. -- The STS-112 crew takes part in a post-landing briefing for the media. Moderating, at left, is George Diller, with the NASA News Center. The crew, from left, are Commander Jeffrey Ashby, Pilot Pamela Melroy and Mission Specialists David Wolf, Sandra Magnus, Piers Sellers and cosmonaut Fyodor Yurchikhin. Mission STS-112 was the 15th assembly flight to the International Space Station, installing the S1 truss. The landing was the 60th at KSC in the history of the Shuttle program.

  12. [Not Available].

    PubMed

    Laurenza, D

    1998-01-01

    Physiognomics is included by Leonardo among the matters to be treated in his book of anatomy. In this context embriology provides physiognomics with a scientific explanation through the theory of the generative soul (virtus formativa) which directly produces the detailed form of each individual body or compositio. Unlike the well-known medical concept of complexio, compositio concerns the solid parts of the body and it is a part of a physiological and psychological theory alternative to the humoral one. Leonardo appears to be influenced by a scholastic tradition of biology represented by authors such as Albertus Magnus and the fifteenth-century Bolognese doctor Hieronymo Manfredi.

  13. STS-112 crew inspects S1 Truss in O&C building

    NASA Technical Reports Server (NTRS)

    2001-01-01

    KENNEDY SPACE CENTER, Fla. - From the floor of the Operations and Checkout Bldg,, members of the STS-112 crew look over the Integrated Truss Structure (ITS) S1 above them that will be part of the payload on the mission. The crew comprises Commander Jeffrey S. Ashby, Pilot Pamela A. Melroy and Mission Specialists David A. Wolf, Piers J. Sellers, Sandra H. Magnus and Fyodor Nikolayevich Yurchikhin, a cosmonaut with the Russian Aviation and Space Agency. Mission STS-112 is scheduled for launch in July 2002.

  14. STS-112 crew inspects S1 Truss in O&C building

    NASA Technical Reports Server (NTRS)

    2001-01-01

    KENNEDY SPACE CENTER, Fla. -- Members of the STS-112 crew pose for a photo while looking over the Integrated Truss Structure (ITS) S1 (behind them). The ITS S1 is part of the payload on the mission. Standing left to right are Mission Specialists Fyodor Nikolayevich Yurchikhin, a cosmonaut with the Russian Aviation and Space Agency, David A. Wolf, and Sandra H. Magnus; Pilot Pamela A. Melroy; Mission Specialist Piers J. Sellers; and Commander Jeffrey S. Ashby. Mission STS-112 is scheduled for launch in July 2002

  15. KSC-2011-6493

    NASA Image and Video Library

    2011-08-13

    CAPE CANAVERAL, Fla. -- STS-135 Mission Specialists Rex Walheim, left, and Sandy Magnus, and STS-135 Commander Chris Ferguson address thousands of space shuttle workers and their families at the “We Made History! Shuttle Program Celebration,” Aug. 13, at the Kennedy Space Center Visitor Complex, Fla. The event was held to honor current and former workers’ dedication to NASA’s Space Shuttle Program and to celebrate 30 years of space shuttle achievements. The event featured food, music, entertainment, astronaut appearances, educational activities, giveaways, and Starfire Night Skyshow. Photo credit: Jim Grossmann

  16. KSC-2011-6483

    NASA Image and Video Library

    2011-08-13

    CAPE CANAVERAL, Fla. -- Kennedy Space Center Director Bob Cabana (at left) and NASA astronauts Rex Walheim, Sandra Magnus and Chris Ferguson talk to current and former space shuttle workers and their families during the “We Made History! Shuttle Program Celebration,” Aug. 13, at the Kennedy Space Center Visitor Complex, Fla. The event was held to honor current and former shuttle workers’ dedication to NASA’s Space Shuttle Program and to celebrate 30 years of space shuttle achievements. The event featured food, music, entertainment, astronaut appearances, educational activities, giveaways, and Starfire Night Skyshow. Photo credit: Gianni Woods

  17. New Staphylinidae (Coleoptera) records with new collection data from New Brunswick, Canada: Omaliinae, Micropeplinae, Phloeocharinae, Olisthaerinae, and Habrocerinae

    PubMed Central

    Webster, Reginald P.; Sweeney, Jon D.; DeMerchant, Ian

    2012-01-01

    Abstract Eleven species of Omaliinae are newly recorded from New Brunswick, bringing the total number of species known from the province to 32 described species. Supporting data are presented for the New Brunswick record of Geodromicus strictus (Fauvel) reported by Majka et al. (2011). Micropeplus browni Campbell, Micropeplus laticollis Mäklin (Micropeplinae), Charyhyphus picipennis (LeConte) (Phloeocharinae), Olisthaerus substriatus (Paykull) (Olisthaerinae), Habrocerus capillaricornis (Gravenhorst), Habrocerus magnus LeConte, and Habrocerus schwarzi Horn (Habrocerinae) are also newly recorded for New Brunswick. These are the first records of the latter four subfamilies from New Brunswick. Collection and bionomic data are presented for each species and discussed. PMID:22577316

  18. LOH- RadGene experiment at Cell Biology Experiment Facility (CBEF)

    NASA Image and Video Library

    2009-02-20

    ISS018-E-034074 (20 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, works with the LOH- RadGene experiment near the Cell Biology Experiment Facility (CBEF) in the Kibo laboratory of the International Space Station. This experiment investigates alterations in immature immune cells that have been exposed to cosmic radiation. The samples were placed in culture bags and launched to the ISS on the STS-126 mission. After the experiment, frozen samples will be returned to the ground on the STS-119 mission.

  19. LOH- RadGene experiment at Cell Biology Experiment Facility (CBEF)

    NASA Image and Video Library

    2009-02-20

    ISS018-E-034555 (20 Feb. 2009) --- Astronaut Sandra Magnus, Expedition 18 flight engineer, takes a moment for a photo while working with the LOH- RadGene experiment at the Cell Biology Experiment Facility (CBEF) in the Kibo laboratory of the International Space Station. This experiment investigates genetic alterations in immature immune cells that have been exposed to cosmic radiation. The samples were placed in culture bags and launched to the ISS on the STS-126 mission. After the experiment, frozen samples will be returned to the ground on the STS-119 mission.

  20. Aerodynamics of Tactical Weapons to Mach Number 3 and Angle of Attack 15 deg. Part I. Theory and Application.

    DTIC Science & Technology

    1977-02-01

    or = M or = 3 and O or = alpha or = 15 deg, respectively. Body and wing geometries can be quite general in that pointed or blunt nose bodies and sharp or blunt leading edge wings can be assumed. Computed results for several configurations compare well with experimental and other analytical results. The computer program is cost effective as it costs less than ten dollars per Mach number to compute the lift, drag, pitching moment, magnus moment, roll damping moment, and pitch damping moment of a typical wing-body shape on the CDC 6700 computer. Thus, a reasonably accurate

  1. Troposcatter at the KU Band

    DTIC Science & Technology

    1994-06-01

    Band by Magnus Wennemyr 1 Introduction Appendix Page no. 1 1.1 Introduction I 1.2 Transhorizonal Microwave Propagation n the Troposphere I 1.3 The...1.7.1 Diurnal and Seasonal variations 4 1.7.2 Modes of Propagation 5 1.8 Conclusions 5 2 Effect of the Troposphere on Microwave Propagation 6 2.1...allowing for transhorizonal communication in the microwave ranges. This study tests the viability of using the higher frequency ranges (the test

  2. KSC-02pd1445

    NASA Image and Video Library

    2002-10-07

    KENNEDY SPACE CENTER, FLA. - STS-112 Mission Specialist Sandra Magnus finishes suiting up before launch. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure and the Crew and Equipment Translation Aid (CETA) Cart A. The CETA is the first of two human-powered carts that will ride along the ISS railway, providing mobile work platforms for future spacewalking astronauts. On the 11-day mission, three spacewalks are planned to attach the S1 truss to the Station. Launch is scheduled for 3:46 p.m. EDT from Launch Pad 39B.

  3. KSC-2011-6478

    NASA Image and Video Library

    2011-08-13

    CAPE CANAVERAL, Fla. -- Attending Kennedy Space Center’s “We Made History! Shuttle Program Celebration,” Aug. 13, at the Kennedy Space Center Visitor Complex in Florida, are from left, NASA astronauts Nicole Stott, Michael Fincke, Greg Johnson, Sandra Magnus, Rex Walheim and Chris Ferguson, and Kennedy Deputy Director Janet Petro. The event was held to honor shuttle workers’ dedication to NASA’s Space Shuttle Program and to celebrate 30 years of space shuttle achievements. The event featured food, music, entertainment, astronaut appearances, educational activities, giveaways, and Starfire Night Skyshow. Photo credit: Gianni Woods

  4. Dynamics of two-dimensional vortex pairs in a spatially varying potential

    NASA Astrophysics Data System (ADS)

    Lee, H. H.; Gunn, J. M. F.

    1992-10-01

    We consider the dynamics of vortices in a superfluid 4He film flowing over a substrate at zero temperature. The vortex trajectories are assumed to be governed by the Magnus-force equation with the effect of the substrate incorporated via the gradient of a potential. We use an equivalent Hamiltonian formulation to show that two vortices in a slowly varying potential can exhibit stochastic behavior. In this regard, there are differences between the cases of two vortices of the same sign and those of the opposite sign, the latter becoming stochastic more readily.

  5. Time-dependent perturbation theory for inelastic scattering

    NASA Astrophysics Data System (ADS)

    Cross, R. J.

    1982-08-01

    We show by numerical integration that the first-order, time-dependent, Magnus approximation agrees with the first-order, exponential, distorted-wave approximation to within a few percent, provided that the trajectory used for the time-dependent calculation is characterized by the arithmetic mean of the initial and final velocities and the arithmetic mean of the initial and final orbital angular momenta. Calculations are done for rotational energy transfer from an exponentially repulsive potential characteristic of He+H2 and for a Lennard-Jones potential characteristic of Ar+N2.

  6. Symmetric missile dynamic instabilities: A review

    NASA Astrophysics Data System (ADS)

    Murphy, C. H.

    1980-03-01

    Dynamic instabilities observed for symmetric missiles and projectiles arise from a large variety of causes. These include unstable linear damping moments, and different nonlinear in-plane and out-of-plane damping moments for nonspinning re-entry vehicles, nonlinear Magnus moments for spinning missiles, and internal resonance with moving payload components. If aerodynamic trim is present, linear spin-yaw resonance can occur as well as nonlinear subharmonic motions and a number of other limit motions. This report gives a complete survey of these possibilities with a number of actual case histories.

  7. Explicit, Nearly Optimal, Linear Rational Approximation with Preassigned Poles,

    DTIC Science & Technology

    1983-02-01

    Henrici , P., "Applied and Computational Complex Analysis ", V. 2., John Wiley, N.Y. (1977). [8] Magnus, W., Oberhettinger, F., and Soni, R. P., "Formulas...U denote the unit disc in the complex plane, let g be in the Hardy space H (U), and let f(z) = (I - z 2)g(z). Let P denote thep n space of polynomials...Fourier series. Let R > 1, and let A denote the annular region in the R A 5 complex plane C, AR = (w e C: R < lwl < R), let F be analytic in AR, and

  8. View of ISS as it Rotates 90 Degrees

    NASA Image and Video Library

    2011-07-19

    S135-E-011814 (19 July 2011) --- This picture of the International Space Station was photographed from the space shuttle Atlantis as the orbiting complex and the shuttle performed their relative separation in the early hours of July 19, 2011. Onboard the station were Russian cosmonauts Andrey Borisenko, Expedition 28 commander; Sergei Volkov and Alexander Samokutyaev, both flight engineers; Japan Aerospace Exploration astronaut Satoshi Furukawa, and NASA astronauts Mike Fossum and Ron Garan, all flight engineers. Onboard the shuttle were NASA astronauts Chris Ferguson, STS-135 commander; Doug Hurley, pilot; and Sandy Magnus and Rex Walheim, both mission specialists. Photo credit: NASA

  9. STS-135/Expedition 28 Crew Members during dinner on the Shuttle Middeck

    NASA Image and Video Library

    2011-07-14

    ISS028-E-016601 (14 July 2011) --- The four STS-135 crewmembers, quite accustomed to going en masse to the International Space Station, reverse roles for the occasion of the "All-American Meal" on the middeck of the space shuttle Atlantis. Russian cosmonaut Alexander Samokutyaev, Expedition 28 flight engineer, shares the meal the Atlantis crew in the frame and with five of his station crewmates, who are out of frame. The STS-135 crewmembers are NASA astronauts Chris Ferguson (right), mission commander, along with Doug Hurley (left), pilot; and Sandy Magnus and Rex Walheim, both mission specialists.

  10. Motion Coordination and Adaptation Using Deception and Human Interactions

    DTIC Science & Technology

    2016-11-18

    AFRL-AFOSR-VA-TR-2016-0361 Motion Coordination and Adaptation Using Deception and Human Interactions Magnus Egerstedt GEORGIA TECH RESEARCH...ApprovedOMB No. 0704-0188 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER 6. AUTHOR(S) 7. PERFORMING ORGANIZATION...NAME(S) AND ADDRESS(ES) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER 10. SPONSOR/MONITOR’S ACRONYM(S

  11. Effects of time ordering in quantum nonlinear optics

    NASA Astrophysics Data System (ADS)

    Quesada, Nicolás; Sipe, J. E.

    2014-12-01

    We study time-ordering corrections to the description of spontaneous parametric down-conversion (SPDC), four-wave mixing (SFWM), and frequency conversion using the Magnus expansion. Analytic approximations to the evolution operator that are unitary are obtained. They are Gaussian preserving, and allow us to understand order-by-order the effects of time ordering. We show that the corrections due to time ordering vanish exactly if the phase-matching function is sufficiently broad. The calculation of the effects of time ordering on the joint spectral amplitude of the photons generated in SPDC and SFWM are reduced to quadrature.

  12. Unfolding of Vortices into Topological Stripes in a Multiferroic Material

    NASA Astrophysics Data System (ADS)

    Wang, X.; Mostovoy, M.; Han, M. G.; Horibe, Y.; Aoki, T.; Zhu, Y.; Cheong, S.-W.

    2014-06-01

    Multiferroic hexagonal RMnO3 (R =rare earths) crystals exhibit dense networks of vortex lines at which six domain walls merge. While the domain walls can be readily moved with an applied electric field, the vortex cores so far have been impossible to control. Our experiments demonstrate that shear strain induces a Magnus-type force pulling vortices and antivortices in opposite directions and unfolding them into a topological stripe domain state. We discuss the analogy between this effect and the current-driven dynamics of vortices in superconductors and superfluids.

  13. Second-order shaped pulsed for solid-state quantum computation

    SciTech Connect

    Sengupta, Pinaki

    2008-01-01

    We present the construction and detailed analysis of highly optimized self-refocusing pulse shapes for several rotation angles. We characterize the constructed pulses by the coefficients appearing in the Magnus expansion up to second order. This allows a semianalytical analysis of the performance of the constructed shapes in sequences and composite pulses by computing the corresponding leading-order error operators. Higher orders can be analyzed with the numerical technique suggested by us previously. We illustrate the technique by analyzing several composite pulses designed to protect against pulse amplitude errors, and on decoupling sequences for potentially long chains of qubits with on-site and nearest-neighbor couplings.

  14. Force balance on two-dimensional superconductors with a single moving vortex

    NASA Astrophysics Data System (ADS)

    Chung, Chun Kit; Arahata, Emiko; Kato, Yusuke

    2014-03-01

    We study forces on two-dimensional superconductors with a single moving vortex based on a recent fully self-consistent calculation of DC conductivity in an s-wave superconductor (E. Arahata and Y. Kato, arXiv:1310.0566). By considering momentum balance of the whole liquid, we attempt to identify various contributions to the total transverse force on the vortex. This provides an estimation of the effective Magnus force based on the quasiclassical theory generalized by Kita [T. Kita, Phys. Rev. B, 64, 054503 (2001)], which allows for the Hall effect in vortex states.

  15. Survival of Rydberg atoms in intense laser fields and the role of nondipole effects

    NASA Astrophysics Data System (ADS)

    Klaiber, Michael; Dimitrovski, Darko

    2015-02-01

    We consider the interaction of Rydberg atoms with strong infrared laser pulses using an approach based on the Magnus expansion of the time evolution operator. First-order corrections beyond the electric dipole approximation are also included in the theory. We illustrate the dynamics of the interaction at the parameters of the experiment [Eichmann et al., Phys. Rev. Lett. 110, 203002 (2013), 10.1103/PhysRevLett.110.203002]. It emerges that the depletion of Rydberg atoms in this regime comes predominantly from the nondipole effects.

  16. STS-112 crew in front of Launch Pad 39B before launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. - Members of the STS-112 crew pose in front of Launch Pad 39B during a tour of Kennedy Space Center prior to launch. From left, they are Mission Specialist Sandra H. Magnus, Commander Jeffrey S. Ashby, Pilot Pamela Ann Melroy, a nd Mission Specialists David A. Wolf, Fyodor N. Yurchikhin of the Russian Space Agency, and Piers J. Sellers. The launch of Space Shuttle Atlantis was postponed today to no earlier than Thursday, Oct. 3, while weather forecasters and the mission managemen t team assess the possible effect Hurricane Lili may have on the Mission Control Center located at the Lyndon B. Johnson Space Center in Houston, Texas.

  17. Hydrodynamic Aspects of the Toms Effect

    NASA Astrophysics Data System (ADS)

    Strel‧nikova, S. A.; Tkachenko, G. V.; Uryukov, B. A.

    2015-11-01

    The physicomathematical model of migration of polymers in a liquid turbulent flow in a pipe is based on a comparison of forces transverse to the motion of the mainstream flow: the Saffman, Magnus, and turbophoresis forces. It has been shown that the polymer particles are grouped near a certain boundary within the limits of the boundary layer. On this basis, the authors have made assumptions on the mechanism of suppression of turbulent pulsations and decrease in the viscous friction near the wall, which makes up the Toms effect. The proposed model satisfies, at least, qualitatively, various actually observed manifestations of the effect.

  18. STS-112 Pilot Melroy inspects cables prior to launch

    NASA Technical Reports Server (NTRS)

    2002-01-01

    KENNEDY SPACE CENTER, FLA. - STS-112 Pilot Pamela Ann Melroy (left) conducts a last-minute inspection of some cables inside Space Shuttle Atlantis at Launch Pad 39B prior to the launch of her mission. The STS-112 crew also includes Commander Jeffrey S. Ashby and Mission Specialists David A. Wolf, Sandra H. Magnus, Piers J. Sellers, and Fyodor N. Yurchikhin of the Russian Space Agency. Launch of the mission was postponed today to no earlier than Thursday, Oct. 3, while weather forecasters and the mission management team assess the possible effect Hurricane Lili may have on the Mission Control Center located at the Lyndon B. Johnson Space Center in Houston, Texas.

  19. Improving the In-Medium Similarity Renormalization Group via approximate inclusion of three-body effects

    NASA Astrophysics Data System (ADS)

    Morris, Titus; Bogner, Scott

    2016-09-01

    The In-Medium Similarity Renormalization Group (IM-SRG) has been applied successfully to the ground state of closed shell finite nuclei. Recent work has extended its ability to target excited states of these closed shell systems via equation of motion methods, and also complete spectra of the whole SD shell via effective shell model interactions. A recent alternative method for solving of the IM-SRG equations, based on the Magnus expansion, not only provides a computationally feasible route to producing observables, but also allows for approximate handling of induced three-body forces. Promising results for several systems, including finite nuclei, will be presented and discussed.

  20. Skyrmionic spin Seebeck effect via dissipative thermomagnonic torques

    NASA Astrophysics Data System (ADS)

    Kovalev, Alexey A.

    2014-06-01

    We derive thermomagnonic torque and its "β-type" dissipative correction from the stochastic Landau-Lifshitz-Gilbert equation. The β-type dissipative correction describes viscous coupling between magnetic dynamics and magnonic current and it stems from spin mistracking of the magnetic order. We show that thermomagnonic torque is important for describing temperature gradient induced motion of skyrmions in helical magnets while dissipative correction plays an essential role in generating transverse Magnus force. We propose to detect such skyrmionic motion by employing the transverse spin Seebeck effect geometry.