Spin Effects in Long Range Gravitational Scattering

We study the gravitational scattering of massive particles with and without spin in the effective theory of gravity at one loop level. Our focus is on long distance effects arising from nonanalytic components of the scattering amplitude and we show that the spin-independent and the spin-dependent long range components exhibit a universal form. Both classical and quantum corrections are obtained, and the definition of a proper second order potential is discussed.Comment: 51 pages, 8 figure

Long Distance Effects in Mixed Electromagnetic-Gravitational Scattering

Using the methods of effective field theory we examine long range effects in mixed electromagnetic-gravitational scattering. Recent calculations which have yielded differing results for such effects are examined and corrected. We consider various spin configurations of the scattered particles and find that universality with respect to spin-dependence is obtained in agreement with expectations.Comment: 38 pages, 6 figure

Long distance effects and strangeness in the nucleon

We discuss the calculation of the strange magnetic radius of the proton in chiral perturbation theory. In particular, we investigate the low-energy component of the loop integrals involving kaons. We separate the chiral calculation into a low-energy part and a high-energy component through use of a momentum space separation scale. This separation shows that most of the chiral calculation comes from high energies where the effective field theory treatment is not valid. The resulting low-energy prediction is in better agreement with dispersive treatments. Finally, we briefly discuss magnetic moments and show how our techniques can help resolve an old puzzle in understanding the magnetic moments of the proton and S

Dugodosežzni učinci i stranost u nukleonu

We discuss the calculation of the strange magnetic radius of the proton in chiral perturbation theory. In particular, we investigate the low-energy component of the loop integrals involving kaons. We separate the chiral calculation into a low-energy part and a high-energy component through use of a momentum space separation scale. This separation shows that most of the chiral calculation comes from high energies where the effective field theory treatment is not valid. The resulting lowenergy prediction is in better agreement with dispersive treatments. Finally, we briefly discuss magnetic moments and show how our techniques can help resolve an old puzzle in understanding the magnetic moments of the proton and Σ+.Raspravljamo o računanju stranog magnetskog polumjera protona u kiralnoj teoriji smetnje. Posebice, istražujemo niskoenergijsku sastavnicu kaonskih petljanih integrala. Razdvajamo kiralni račun u niskoenergijski dio i visokoenergijsku sastavnicu primjenom razdvajajuće ljestvice impulsnog prostora. To razdvajanje pokazuje da kiralni račun većim dijelom daje doprinos na visokim energijama za koje efektivna teorija polja nije dobra. Predviđanje za niske energije je u boljem skladu s disperzivnim računom. Na kraju, kratko raspravljamo magnetske momente i pokazujemo kako naše metode mogu riješiti stari problem razumijevanja magnetskih momenata protona i Σ+

Untersuchungen zur Linearisierbarkeit von AE-Sensorkennlinien am Beispiel von Reibungsvorgängen an einem Bremsmodell

Es werden Kennlinien der Empfindlichkeit von Schallemissionssensoren in einem Frequenzbereich von 20 kHz bis 500kHz verglichen. Anschließend werden die Vorteile der Verwendung von Piezokompositen in neuen AE-Sensoren für die Linearisierung der Kennlinie vorgestellt und diskutiert. Hierbei soll vorrangig die Unterdrückung unerwünschter Resonanzen gegenüber konventionellen AE-Sensoren betrachtet werden. Beispielhaft werden unterschiedliche AE-Sensortypen an einem "vereinfachten" Bremsmodell zur Untersuchung reibungsinduzierter Vorgänge eingesetzt. Die Vorteile von AE-Sensoren auf Basis von Piezokompositen werden für die Bewertung und Lokalisierung unterschiedlicher physikalischer Prozesse verifiziert

Safety of intramuscular COVID-19 vaccination in patients with haemophilia

Background: Guidelines recommend that patients with haemophilia should preferably receive vaccination subcutaneously. COVID-19 and other vaccines, however, are only licenced for intramuscular application. Aims: To assess the safety of intramuscular COVID-19 vaccination in patients living with haemophilia. Methods: Part A of this prospective observational study enrolled consecutive patients with haemophilia A (HA) and B (HB) of all ages and severities and assessed injection site bleeding and other complications within 30 days of vaccination. Part B enrolled patients providing informed consent for detailed data collection including medication and prophylaxis around the time of vaccination. Logistic regression was performed to assess potential risk factors for bleeding. Results: Four hundred and sixty-one patients were enrolled into part A. The primary endpoint injection site bleeding occurred in seven patients (1.5%, 95% confidence interval .7–3.1%). Comprehensive analysis of 214 patients (404 vaccinations, part B) revealed that 97% of patients with severe haemophilia had prophylaxis before vaccination, either as part of their routine prophylaxis or using additional doses. 56% and 30% of patients with moderate and mild haemophilia, respectively, received prophylaxis before vaccination. Among the seven bleeds recorded, three occurred when intramuscular vaccination was done without prophylaxis (odds ratio 12). Conclusions: This is the first prospective study reporting on the safety of intramuscular vaccination in haemophilia. The rate of injection site bleeding was low in mild haemophilia, and in moderate and severe haemophilia if patients received factor prophylaxis