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  1. AU="Gaißer, M"
  2. AU="Spengler, Andrea"
  3. AU="Patel, Dilipkumar"
  4. AU="Liu, Wenshuo"
  5. AU="Paldusová, B."
  6. AU="Kemp, Joanna"
  7. AU="Wang, J. Y"
  8. AU="Reddy, Vineet N"
  9. AU="Htway, Zin"
  10. AU=Higashihara Kazuya
  11. AU="Bhat, Swapna"
  12. AU="Christofer Lundqvist"
  13. AU="Mendez, Carol"
  14. AU="Cosimi, Anthony Benedict"
  15. AU="Rhoton, Albert L"
  16. AU="Ahmad, Ahmir"
  17. AU="Salewski, D L"
  18. AU="Akaichi, Faical"
  19. AU="Terry, C C"
  20. AU="VanMorlan, Amie M"
  21. AU="Marcus, Gail"

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  1. Buch ; Online ; Dissertation / Habilitation: Simulations of the atomic beam transport in an atomic beam source under the influence of spin-selective sextupole magnets

    Gaißer, Martin

    2013  

    Abstract: Zsfassung in dt. und engl. ... ...

    Verfasserangabe vorgelegt von Martin Gaißer
    Abstract Zsfassung in dt. und engl. Sprache
    Sprache Englisch
    Umfang Online-Ressource
    Dokumenttyp Buch ; Online ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Köln, 2014
    Datenquelle Ehemaliges Sondersammelgebiet Küsten- und Hochseefischerei

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  2. Buch ; Online ; Dissertation / Habilitation: Simulations of the atomic beam transport in an atomic beam source under the influence of spin-selective sextupole magnets

    Gaißer, Martin

    2013  

    Abstract: Zsfassung in dt. und engl. ... ...

    Verfasserangabe vorgelegt von Martin Gaißer
    Abstract Zsfassung in dt. und engl. Sprache
    Sprache Englisch
    Umfang Online-Ressource
    Dokumenttyp Buch ; Online ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Köln, 2014
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  3. Artikel: Funktionserhalt chirurgischer Instrumente durch dampfsterilisierbare Öle

    Fuchs, W. / Gaißer, M.

    Aseptica : [Deutsche Ausgabe] : Fachmagazin für Krankenhaus- und Praxishygiene

    2007  Band 13, Heft 2, Seite(n) 15

    Sprache Deutsch
    Dokumenttyp Artikel
    ZDB-ID 1390610-0
    ISSN 1439-9016
    Datenquelle Current Contents Medizin

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  4. Artikel ; Online: Biotribology of a new bearing material combination in a rotating hinge knee articulation.

    Grupp, T M / Giurea, A / Miehlke, R K / Hintner, M / Gaisser, M / Schilling, C / Schwiesau, J / Kaddick, C

    Acta biomaterialia

    2013  Band 9, Heft 6, Seite(n) 7054–7063

    Abstract: The objective of the present study was to evaluate the biotribological behaviour, in terms of wear and particle release, of bushings and flanges made of carbon fibre reinforced poly-ether-ether-ketone (CFR-PEEK) in articulation with a zirconium nitride ( ... ...

    Abstract The objective of the present study was to evaluate the biotribological behaviour, in terms of wear and particle release, of bushings and flanges made of carbon fibre reinforced poly-ether-ether-ketone (CFR-PEEK) in articulation with a zirconium nitride (ZrN) multilayer surface coating in a rotating hinge knee system. For the bushings of the rotational and flexion axles and the medial and lateral flanges, a CFR-PEEK with 30% polyacrylonitrile fibre content was used in a new bearing combination with ZrN. In vitro wear simulation was performed for patients with metal ion hypersensitivity, using a new rotating hinge knee design with a ZrN surface articulation in comparison with the clinically established cobalt-chromium version. For the bushings and flanges made of CFR-PEEK subjected to wear simulation, the volumetric wear rates were 2.3±0.48mm(3)million(-1) cycles in articulation to cobalt-chromium as reference and 0.21±0.02mm(3)million(-1) cycles in the coupling with ZrN, a 10.9-fold decrease. The released CFR-PEEK particles were comparable in size and shape for the coupling to cobalt-chromium and ZrN with most of the particles in a size range between 0.1 and 2μm. The study reveals comparable low wear and no macroscopic surface fatigue in a new rotating hinge knee design with highly congruent flanges and axles bushings made of CFR-PEEK articulating to a ZrN multilayer surface coating. Favourable wear behaviour of the newly introduced CFR-PEEK/ZrN coupling in comparison with the clinically established CFR-PEEK/cobalt-chromium articulation was found.
    Mesh-Begriff(e) Biocompatible Materials/chemistry ; Biomimetic Materials ; Carbon/chemistry ; Friction ; Ketones/chemistry ; Knee Joint/physiology ; Lubricants/chemistry ; Lubrication/methods ; Materials Testing ; Polyethylene Glycols/chemistry ; Range of Motion, Articular/physiology ; Rotation
    Chemische Substanzen Biocompatible Materials ; Ketones ; Lubricants ; carbon fiber ; Polyethylene Glycols (30IQX730WE) ; polyetheretherketone (31694-16-3) ; Carbon (7440-44-0)
    Sprache Englisch
    Erscheinungsdatum 2013-06
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2173841-5
    ISSN 1878-7568 ; 1742-7061
    ISSN (online) 1878-7568
    ISSN 1742-7061
    DOI 10.1016/j.actbio.2013.02.030
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: Life expectancy of modular Ti6Al4V hip implants: influence of stress and environment.

    Chandra, A / Ryu, J J / Karra, P / Shrotriya, P / Tvergaard, V / Gaisser, M / Weik, T

    Journal of the mechanical behavior of biomedical materials

    2011  Band 4, Heft 8, Seite(n) 1990–2001

    Abstract: Stress dependent electrochemical dissolution is identified as one of the key mechanisms governing surface degradation in fretting and crevice corrosion of biomedical implants. The present study focuses on delineating the roles of mechanical stress and ... ...

    Abstract Stress dependent electrochemical dissolution is identified as one of the key mechanisms governing surface degradation in fretting and crevice corrosion of biomedical implants. The present study focuses on delineating the roles of mechanical stress and chemical conditions on the life expectancy of modular hip implants. First, material removal on a stressed surface of Ti6Al4V subjected to single asperity contact is investigated experimentally to identify the influence of contact load, in-plane stress and chemical environment on mean wear rates. A range of known stress levels are applied to the specimen while its surface is mechanically stimulated in different non-reactive to oxidizing aqueous environments. Evolution of surface degradation is monitored, and its mechanism is elucidated. This phase allows estimation of Preston Constant which is later used in the analysis. Second phase of the work is semi-analytical and computational, where, based on the estimated Preston constant and other material and process parameters, the scratch propensity (consisting of magnitude of scratch depth and their frequency per unit area) due to micro-motion in modular hip implants is estimated. The third phase views these scratches as initial notches and utilizes a mixed-mode fatigue crack propagation model to estimate the critical crack length for onset of instability. The number of loading cycles needed to reach this critical crack length is then labeled as the expected life of the implant under given mechanical and chemical conditions. Implications of different material and process conditions to life expectancy of orthopedic implants are discussed. It is observed that transverse micro-motion, compared to longitudinal micro-motion, plays a far more critical role in determining the implant life. Patient body weight, as well as proximity of the joint fluid to its iso-electric point play key roles in determining wear rates and associated life expectancies of modular hip implants. Sustained aeration of joint fluid, as well as proper tolerancing of mating surfaces, along with a proper choice of material microstructure may be utilized to extend implant life.
    Mesh-Begriff(e) Corrosion ; Environment ; Hardness ; Hip ; Materials Testing ; Prostheses and Implants ; Stress, Mechanical ; Time Factors ; Titanium/chemistry
    Chemische Substanzen titanium alloy (TiAl6V4) (12743-70-3) ; Titanium (D1JT611TNE)
    Sprache Englisch
    Erscheinungsdatum 2011-11
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2378381-3
    ISSN 1878-0180 ; 1751-6161
    ISSN (online) 1878-0180
    ISSN 1751-6161
    DOI 10.1016/j.jmbbm.2011.06.018
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel: Biotribology of a new bearing material combination in a rotating hinge knee articulation

    Grupp, T.M / Giurea, A / Miehlke, R.K / Hintner, M / Gaisser, M / Schilling, C / Schwiesau, J / Kaddick, C

    Acta Biomaterialia. 2013 June, v. 9, no. 6

    2013  

    Abstract: The objective of the present study was to evaluate the biotribological behaviour, in terms of wear and particle release, of bushings and flanges made of carbon fibre reinforced poly-ether-ether-ketone (CFR-PEEK) in articulation with a zirconium nitride ( ... ...

    Abstract The objective of the present study was to evaluate the biotribological behaviour, in terms of wear and particle release, of bushings and flanges made of carbon fibre reinforced poly-ether-ether-ketone (CFR-PEEK) in articulation with a zirconium nitride (ZrN) multilayer surface coating in a rotating hinge knee system. For the bushings of the rotational and flexion axles and the medial and lateral flanges, a CFR-PEEK with 30% polyacrylonitrile fibre content was used in a new bearing combination with ZrN. In vitro wear simulation was performed for patients with metal ion hypersensitivity, using a new rotating hinge knee design with a ZrN surface articulation in comparison with the clinically established cobalt–chromium version. For the bushings and flanges made of CFR-PEEK subjected to wear simulation, the volumetric wear rates were 2.3±0.48mm³million⁻¹ cycles in articulation to cobalt–chromium as reference and 0.21±0.02mm³million⁻¹ cycles in the coupling with ZrN, a 10.9-fold decrease. The released CFR-PEEK particles were comparable in size and shape for the coupling to cobalt–chromium and ZrN with most of the particles in a size range between 0.1 and 2μm. The study reveals comparable low wear and no macroscopic surface fatigue in a new rotating hinge knee design with highly congruent flanges and axles bushings made of CFR-PEEK articulating to a ZrN multilayer surface coating. Favourable wear behaviour of the newly introduced CFR-PEEK/ZrN coupling in comparison with the clinically established CFR-PEEK/cobalt–chromium articulation was found.
    Schlagwörter axles ; carbon ; coatings ; fiber content ; hypersensitivity ; particle size ; patients ; polyacrylonitrile ; zirconium
    Sprache Englisch
    Erscheinungsverlauf 2013-06
    Umfang p. 7054-7063.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 2173841-5
    ISSN 1878-7568 ; 1742-7061
    ISSN (online) 1878-7568
    ISSN 1742-7061
    DOI 10.1016/j.actbio.2013.02.030
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel ; Online: Production of hyperpolarized H_{2} molecules from H[over →] atoms in gas-storage cells.

    Engels, R / Gaißer, M / Gorski, R / Grigoryev, K / Mikirtychyants, M / Nass, A / Rathmann, F / Seyfarth, H / Ströher, H / Weiss, P / Kochenda, L / Kravtsov, P / Trofimov, V / Tschernov, N / Vasilyev, A / Vznuzdaev, M / Schieck, H Paetz Gen

    Physical review letters

    2015  Band 115, Heft 11, Seite(n) 113007

    Abstract: The preservation of the nuclear polarization of hydrogen atoms during the recombination to molecules was observed on different surface materials in the temperature range from 45 to 100 K and for magnetic fields up to 1 T. On a gold and a fused quartz ... ...

    Abstract The preservation of the nuclear polarization of hydrogen atoms during the recombination to molecules was observed on different surface materials in the temperature range from 45 to 100 K and for magnetic fields up to 1 T. On a gold and a fused quartz surface, the expected molecular polarization of about 50% or lower of the atomic polarization was measured, while a surface layer of perfluoropolyether (Fomblin) shows a nearly complete preservation (at least 97%) of the atomic polarization during the recombination process. Further experiments have the possibility of storing polarized deuterium molecules and to use them in nuclear-fusion installations. Another application might be the production of polarized substances for enhanced NMR techniques.
    Sprache Englisch
    Erscheinungsdatum 2015-09-11
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.115.113007
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel ; Online: Phase Locking the Spin Precession in a Storage Ring.

    Hempelmann, N / Hejny, V / Pretz, J / Stephenson, E / Augustyniak, W / Bagdasarian, Z / Bai, M / Barion, L / Berz, M / Chekmenev, S / Ciullo, G / Dymov, S / Etzkorn, F-J / Eversmann, D / Gaisser, M / Gebel, R / Grigoryev, K / Grzonka, D / Guidoboni, G /
    Hanraths, T / Heberling, D / Hetzel, J / Hinder, F / Kacharava, A / Kamerdzhiev, V / Keshelashvili, I / Koop, I / Kulikov, A / Lehrach, A / Lenisa, P / Lomidze, N / Lorentz, B / Maanen, P / Macharashvili, G / Magiera, A / Mchedlishvili, D / Mey, S / Müller, F / Nass, A / Nikolaev, N N / Pesce, A / Prasuhn, D / Rathmann, F / Rosenthal, M / Saleev, A / Schmidt, V / Semertzidis, Y / Shmakova, V / Silenko, A / Slim, J / Soltner, H / Stahl, A / Stassen, R / Stockhorst, H / Ströher, H / Tabidze, M / Tagliente, G / Talman, R / Thörngren Engblom, P / Trinkel, F / Uzikov, Yu / Valdau, Yu / Valetov, E / Vassiliev, A / Weidemann, C / Wrońska, A / Wüstner, P / Zuprański, P / Żurek, M

    Physical review letters

    2017  Band 119, Heft 1, Seite(n) 14801

    Abstract: This Letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97  GeV/c bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession ...

    Abstract This Letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97  GeV/c bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession rate (≈121  kHz) and the phase of the horizontal polarization component. Real time synchronization with a radio frequency (rf) solenoid made possible the rotation of the polarization out of the horizontal plane, yielding a demonstration of the feedback method to manipulate the polarization. In particular, the rotation rate shows a sinusoidal function of the horizontal polarization phase (relative to the rf solenoid), which was controlled to within a 1 standard deviation range of σ=0.21  rad. The minimum possible adjustment was 3.7 mHz out of a revolution frequency of 753 kHz, which changes the precession rate by 26  mrad/s. Such a capability meets a requirement for the use of storage rings to look for an intrinsic electric dipole moment of charged particles.
    Sprache Englisch
    Erscheinungsdatum 2017-07-07
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.119.014801
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: How to Reach a Thousand-Second in-Plane Polarization Lifetime with 0.97-GeV/c Deuterons in a Storage Ring.

    Guidoboni, G / Stephenson, E / Andrianov, S / Augustyniak, W / Bagdasarian, Z / Bai, M / Baylac, M / Bernreuther, W / Bertelli, S / Berz, M / Böker, J / Böhme, C / Bsaisou, J / Chekmenev, S / Chiladze, D / Ciullo, G / Contalbrigo, M / de Conto, J-M / Dymov, S /
    Engels, R / Esser, F M / Eversmann, D / Felden, O / Gaisser, M / Gebel, R / Glückler, H / Goldenbaum, F / Grigoryev, K / Grzonka, D / Hahnraths, T / Heberling, D / Hejny, V / Hempelmann, N / Hetzel, J / Hinder, F / Hipple, R / Hölscher, D / Ivanov, A / Kacharava, A / Kamerdzhiev, V / Kamys, B / Keshelashvili, I / Khoukaz, A / Koop, I / Krause, H-J / Krewald, S / Kulikov, A / Lehrach, A / Lenisa, P / Lomidze, N / Lorentz, B / Maanen, P / Macharashvili, G / Magiera, A / Maier, R / Makino, K / Mariański, B / Mchedlishvili, D / Meißner, Ulf-G / Mey, S / Morse, W / Müller, F / Nass, A / Natour, G / Nikolaev, N / Nioradze, M / Nowakowski, K / Orlov, Y / Pesce, A / Prasuhn, D / Pretz, J / Rathmann, F / Ritman, J / Rosenthal, M / Rudy, Z / Saleev, A / Sefzick, T / Semertzidis, Y / Senichev, Y / Shmakova, V / Silenko, A / Simon, M / Slim, J / Soltner, H / Stahl, A / Stassen, R / Statera, M / Stockhorst, H / Straatmann, H / Ströher, H / Tabidze, M / Talman, R / Thörngren Engblom, P / Trinkel, F / Trzciński, A / Uzikov, Yu / Valdau, Yu / Valetov, E / Vassiliev, A / Weidemann, C / Wilkin, C / Wrońska, A / Wüstner, P / Zakrzewska, M / Zuprański, P / Zyuzin, D

    Physical review letters

    2016  Band 117, Heft 5, Seite(n) 54801

    Abstract: We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of a magnetic storage ring (COSY). This long spin coherence time is maintained through a combination of beam bunching, electron cooling, sextupole field corrections, and ...

    Abstract We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of a magnetic storage ring (COSY). This long spin coherence time is maintained through a combination of beam bunching, electron cooling, sextupole field corrections, and the suppression of collective effects through beam current limits. This record lifetime is required for a storage ring search for an intrinsic electric dipole moment on the deuteron at a statistical sensitivity level approaching 10^{-29}  e cm.
    Sprache Englisch
    Erscheinungsdatum 2016-07-29
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.117.054801
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel ; Online: New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments.

    Eversmann, D / Hejny, V / Hinder, F / Kacharava, A / Pretz, J / Rathmann, F / Rosenthal, M / Trinkel, F / Andrianov, S / Augustyniak, W / Bagdasarian, Z / Bai, M / Bernreuther, W / Bertelli, S / Berz, M / Bsaisou, J / Chekmenev, S / Chiladze, D / Ciullo, G /
    Contalbrigo, M / de Vries, J / Dymov, S / Engels, R / Esser, F M / Felden, O / Gaisser, M / Gebel, R / Glückler, H / Goldenbaum, F / Grigoryev, K / Grzonka, D / Guidoboni, G / Hanhart, C / Heberling, D / Hempelmann, N / Hetzel, J / Hipple, R / Hölscher, D / Ivanov, A / Kamerdzhiev, V / Kamys, B / Keshelashvili, I / Khoukaz, A / Koop, I / Krause, H-J / Krewald, S / Kulikov, A / Lehrach, A / Lenisa, P / Lomidze, N / Lorentz, B / Maanen, P / Macharashvili, G / Magiera, A / Maier, R / Makino, K / Mariański, B / Mchedlishvili, D / Meißner, Ulf-G / Mey, S / Nass, A / Natour, G / Nikolaev, N / Nioradze, M / Nogga, A / Nowakowski, K / Pesce, A / Prasuhn, D / Ritman, J / Rudy, Z / Saleev, A / Semertzidis, Y / Senichev, Y / Shmakova, V / Silenko, A / Slim, J / Soltner, H / Stahl, A / Stassen, R / Statera, M / Stephenson, E / Stockhorst, H / Straatmann, H / Ströher, H / Tabidze, M / Talman, R / Thörngren Engblom, P / Trzciński, A / Uzikov, Yu / Valdau, Yu / Valetov, E / Vassiliev, A / Weidemann, C / Wilkin, C / Wirzba, A / Wrońska, A / Wüstner, P / Zakrzewska, M / Zuprański, P / Zyuzin, D

    Physical review letters

    2015  Band 115, Heft 9, Seite(n) 94801

    Abstract: A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by ν(s)=γG (γ is the Lorentz factor, G the gyromagnetic anomaly). At 970  MeV/c, ... ...

    Abstract A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by ν(s)=γG (γ is the Lorentz factor, G the gyromagnetic anomaly). At 970  MeV/c, the deuteron spins coherently precess at a frequency of ≈120  kHz in the Cooler Synchrotron COSY. The spin tune is deduced from the up-down asymmetry of deuteron-carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the order 10^{-8}, and to 1×10^{-10} for a continuous 100 s accelerator cycle. This renders the presented method a new precision tool for accelerator physics; controlling the spin motion of particles to high precision is mandatory, in particular, for the measurement of electric dipole moments of charged particles in a storage ring.
    Sprache Englisch
    Erscheinungsdatum 2015-08-28
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.115.094801
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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