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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 945-956 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Tools that have been developed for the extension of the Sterman–Weinberg formula in two-loop order are presented. They are the essential ingredients for any perturbative two-loop calculation in a massless theory. Introducing dimensional regularization, this paper deals with poles up to fourth order in the dimensional parameters. The virtual two-loop integrations as well as real ones over phase space are studied.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 34 (1987), S. 497-522 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the two-jet cross section in order α s 2 in the framework of massless perturbative QCD, using for jet resolution the jet mass. We derive results for two different approaches. One approach is based on the singularity structure of the various contributions. The other one is adjusted to the methods used in three- and four-jet calculations so that the total cross section can be reconstructed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 34 (1987), S. 523-530 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate one loop corrections to heavy quark production in proton antiproton collisions. We cancel ultraviolet and infrared singularities and give the cross sections on the partonic level.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 74 (1987), S. 98-101 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Der Gynäkologe 33 (2000), S. 659-664 
    ISSN: 1433-0393
    Keywords: Schlüsselwörter Vaginale Blutung ; Uterine Blutung ; Ligatur ; Embolisation ; A. uterina ; Logothetopulos-Pack ; Strahlentherapie ; Keywords Vagina bleeding ; Pelvic bleeding ; Ligation ; Embolization ; Uterine artery ; Logothetopulos pack ; Radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Vaginal and uterine bleeding is a common symptom in gynecology. The cause of the bleeding should be investigated so as to exclude carcinoma as its origin. First, the basic circulation parameters should be determined. Blood volume and oxygen substitution are essential. Depending on these findings, further diagnostic or therapeutic steps must be undertaken. If the situation is stable, diagnostic measures are indicated to localize the bleeding and the tumor. A general examination, including a vaginal and rectal examination, must be performed. Other diagnostic procedures such as ultrasound (vaginal and transabdominal) and CT or MRI may be required. If available, an angiography should be performed. Depending on the results of these tests, the hospital staff and equipment available, further therapeutic steps must be evaluated. The most preferable treatment is intra-arterial embolization, which is minimally invasive and almost without any side effects. A trained staff and equipment are indispensable. An alternative for life-threatening uterine bleeding is ligation of the uterine and/or ovarian arteries. Even if performed as a bilateral ligation, side effects due to necroses are rare. In cases of mild bleeding a tamponade with or without haemostatic agents can be performed. Bleeding which is carcinoma related can also be stopped by radiation. It is an alternative therapy for mild bleedings. In principle, the decision about therapy should be based on the clinical situation of the patient, the severity of the bleeding and the available equipment and staff.
    Notes: Zusammenfassung Die vaginale und uterine Blutung ist ein häufig anzutreffendes Symptom in der gynäkologischen Praxis. Jede vaginale Blutung sollte abgeklärt werden, um ein Karzinom als Ursache auszuschließen. Bei der Behandlung der akuten Blutung muss zuerst die Kreislaufsituation der Patientin stabilisiert werden. In Abhängigkeit von der Kreislaufsituation kann bei Stabilität der Lage eine diagnostische Abklärung der Genese der Blutung bzw. des Primärtumors erfolgen. Diagnostische Mittel sind die klinische vaginale und rektale Untersuchung und apparative Untersuchungen wie Ultraschall – vaginal und abdominal –, gebenenfalls CT und MRT. Eine genaue Lokalisation der Blutung kann durch eine Angiographie festgestellt werden. Die Therapie hängt von der personellen und apparativen Ausstattung der Klinik und von der Stärke der Blutung ab. Eine effektive und gezielte Lösung stellt die intraarterielle Embolisation dar. Mit ihr kann selektiv das blutende Gefäß aufgesucht werden, um dann durch Embolisation die Blutung zu stoppen. Diese Methode ist minimal invasiv, Nebenwirkungen treten kaum auf. Der Nachteil ist die geringe Verfügbarkeit in der Praxis, da die personellen und apparativen Vorraussetzungen gegeben sein müssen. Eine Alternative bei schweren, lebensbedrohlichen Blutungen ist die Ligatur der A. uterina und/ oder der A. ovarica. Die Ligatur kann einseitig oder beidseitig durchgeführt werden. Trotz dieser massiven Unterbindung der Blutzufuhr ist nur selten mit Komplikationen zu rechnen, da Nekrosen aufgrund der retrograden Perfusion verhindert werden. Bei leichteren Blutungen kann der Versuch einer Tamponade mit oder ohne hämostatischen Zusatz unternommen werden. Bei karzinombedingten Blutungen kann auch eine Notfallbestrahlung mit hohen Einzeldosen unternommen werden. Sie kommt allerdings nicht bei starken Blutungen in Frage. Prinzipiell muss die Therapieentscheidung von dem Zustand der Patientin, der Stärke der Blutung und den zur Verfügung stehenden personellen und materiellen Dingen abhängig gemacht werden.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Communications in mathematical physics 97 (1985), S. 257-266 
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We calculate the cross section fore + e −→3 jets for longitudinally polarized virtual photons up to order α s 2 in the quark-gluon coupling.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 39 (1988), S. 101-108 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The optimized perturbation theory proposed by Stevenson to deal with coupling constant scheme dependence is applied to the calculation ofπ tot and jet multiplicities ine + e − annihilation. The results are compared with those of simple perturbation theory and with recent experimental cluster multiplicities.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 32 (1986), S. 181-193 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the two nonvanishingO(α s 2 ) parity-violating structure functions that contribute to $$e^ + e^ - \xrightarrow{{\gamma ,Z}}q\bar qg$$ . We discuss how these can be measured. We work with massless quarks and gluons and use dimensional regularization to regularize ultra-violet and infrared singularities. We carefully discuss how to deal withγ 5 in the dimensional regularization scheme when infrared singularities are present.
    Type of Medium: Electronic Resource
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