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  • 1
    Digitale Medien
    Digitale Medien
    Effective interactions involving massive and massless particles of spin 1/2, 1, 3/2, and 2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 423-427 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The Bargman–Wigner theory is used in order to quantize and build interactions "à la Fermi''between massive or massless particles with spin 1/2 , 1, (3)/(2) , and 2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.528931
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  • 2
    Digitale Medien
    Digitale Medien
    Classical solutions of a nonrelativistic model exhibiting spontaneous symmetry breakdown (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 464-469 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: The inverse scattering method is employed in order to obtain solutions of a nonrelativistic and nonlinear model exhibiting spontaneous breakdown of symmetry. Explicit expressions for multiple-soliton solutions are developed. The one-soliton solution exhibits some interesting properties. In particular, they interpolate between two different vacua of the theory differing by a phase related to the soliton velocity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.528412
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  • 3
    Digitale Medien
    Digitale Medien
    Left–right asymmetry and minimal coupling (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 174-195 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: In this paper we deal with an alternative approach to the description of massless particles of arbitrary spin. Within this scheme chiral components of a spinor field are regarded as fundamental quantities and treated as independent field variables. The free field Lagrangian is built up from the requirement of chiral invariance. This formulation is parallel to the neutrino theory and allows for a formulation that generalizes, to particles of arbitrary spin, the two-component neutrino theory. We achieve a spinor formulation of electrodynamics. In the case of the photon, the nonzero helicity components satisfy Weyl's equations and are associated to observables (electromagnetic fields) whereas the zero helicity components are related to nonobservables (electromagnetic potentials). Within the spinor formulation of electrodynamics the minimal coupling substitution follows as a consequence of the linearity of the interaction and the preference of nature for chiral components, that is, of the left–right asymmetry of nature. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.531382
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  • 4
    Digitale Medien
    Digitale Medien
    Symmetrical representation of the transition matrix. II. Relativistic extensions
    Amsterdam : Elsevier
    Annals of Physics 207 (1991), S. 343-373 
    Details
    ISSN: 0003-4916
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0003-4916(91)90061-C
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  • 5
    Digitale Medien
    Digitale Medien
    Weyl-van der Waerden spinor technique for spin-32 fermions
    Amsterdam : Elsevier
    Nuclear Physics, Section B 371 (1992), S. 618-636 
    Details
    ISSN: 0550-3213
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0550-3213(92)90689-9
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  • 6
    Digitale Medien
    Digitale Medien
    Production and decay properties of possible spin 32 leptons
    Amsterdam : Elsevier
    Physics Letters B 94 (1980), S. 367-372 
    Details
    ISSN: 0370-2693
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(80)90898-9
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  • 7
    Digitale Medien
    Digitale Medien
    Tracheostomy in children (1994)
    Springer
    European journal of pediatrics 153 (1994), S. 291-296 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Tracheostomy ; Children ; Complications ; Mortality ; Discharge home
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We reviewed the records of 108 patients who had a tracheostomy performed over a 10-year period from July 1979 to April 1989. Median age at tracheostomy was 6 months (1 week–15 years). Indications for surgery were acquired subglottic stenosis (31.4%), bilateral vocal cord paralysis (22.2%), congenital airway malformations (22.2%) and tumours (11.1%). No epiglottis and no emergency situation had to be managed by tracheostomy. Operation was uneventful in all, but 8 patients (7.4%) developed a pneumothorax in the postoperative period. Twenty-one (19.5%) had severe complications during the cannulation period (tube obstruction in 11 patients with cardiorespiratory arrest in 4; dislocation of the tube in 6 patients). Fifteen patients (13.8%) had severe complications after decannulation (2 had a cardiorespiratory arrest); all 15 had to be recannulated. At the end of the study period 85 patients (78.7%) were successfully decannulated with a median period of tracheostomy of 486 days (8 days–6.6 years). The median hospital stay was 159 days (13 days–2.7 years). All patients could be discharged. Eight patients (7.4%) died but no death was related to tracheostomy. In summary the mortality rate is lower than reported in previous reviews and tracheostomy is a safe operation even in small children but cannula-related complications may lead to life-threatening events. The management of tracheostomized small children and infants in a highly staffed and monitored intensive care unit has allowed better handling of complications and has resulted in a reduction in cannula-related deaths.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01954523
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  • 8
    Digitale Medien
    Digitale Medien
    Tracheostomy in children (1994)
    Springer
    European journal of pediatrics 153 (1994), S. 291-296 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Key words: Tracheostomy – Children – Complications – Mortality – Discharge home
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. We reviewed the records of 108 patients who had a tracheostomy performed over a 10-year period from July 1979 to April 1989. Median age at tracheostomy was 6 months (1 week – 15 years). Indications for surgery were acquired subglottic stenosis (31.4%), bilateral vocal cord paralysis (22.2%), congenital airway malformations (22.2%) and tumours (11.1%). No epiglottis and no emergency situation had to be managed by tracheostomy. Operation was uneventful in all, but 8 patients (7.4%) developed a pneumothorax in the postoperative period. Twenty-one (19.5%) had severe complications during the cannulation period (tube obstruction in 11 patients with cardiorespiratory arrest in 4; dislocation of the tube in 6 patients). Fifteen patients (13.8%) had severe complications after decannulation (2 had a cardiorespiratory arrest); all 15 had to be recannulated. At the end of the study period 85 patients (78.7%) were successfully decannulated with a median period of tracheostomy of 486 days (8 days – 6.6 years). The median hospital stay was 159 days (13 days – 2.7 years). All patients could be discharged. Eight patients (7.4%) died but no death was related to tracheostomy. In summary the mortality rate is lower than reported in previous reviews and tracheostomy is a safe operation even in small children but cannula-related complications may lead to life-threatening events. The management of tracheostomized small children and infants in a highly staffed and monitored intensive care unit has allowed better handling of complications and has resulted in a reduction in cannula-related deaths.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01954523
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  • 9
    Digitale Medien
    Digitale Medien
    Helicity amplitudes for matter-coupled gravity (1994)
    Springer
    General relativity and gravitation 26 (1994), S. 409-425 
    Details
    ISSN: 1572-9532
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The great simplicity attained by the Weyl-van der Waerden spinor technique in the evaluation of helicity invariant amplitudes is shown to apply in the cumbersome calculations within the framework of linearized gravitation. Once the graviton couplings to spin-0, 1/2, 1, and 3/2 particles are given, we exhibit the reach of this method by evaluating, as an example, the helicity amplitudes for the process electron + positron → photon + graviton in a very straightforward way.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02105230
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