Duality properties of Gorringe-Leach equations

In the category of motions preserving the angular momentum's direction, Gorringe and Leach exhibited two classes of differential equations having elliptical orbits. After enlarging slightly these classes, we show that they are related by a duality correspondence of the Arnold-Vassiliev type. The specific associated conserved quantities (Laplace-Runge-Lenz vector and Fradkin-Jauch-Hill tensor) are then dual reflections one of the othe

Serum protein changes in Caplan's syndrome

The British literature on Caplan's syndrome is briefly reviewed with particular reference to the pathogenesis of the pulmonary lesions and an investigation is described which was designed to throw fresh light upon this.Statistical analysis of the results revealed an association between the levels of several serum protein fractions am> the severity of the lung lesions independently of the severity of arthritis. Elevation of α2- and γ-globulins and reduction of albumin and of the albumin/ α2-globulin ratio are consistent with the tuberculous theory of the aetiology of these lesions, but a trend was also observed toward3 higher levels of ß-globulin with increasing severity of pulronary lesions. Rheumatoid arthritis itself rarely produces this effect and no increase of ß-globulin has been reported in tuberculosis.The previously observed association between the presence of "Caplan lesions" in the lungs and positive haemagglutination tests for rheumatoid arthritis was confirmed and a significant correlation demonstrated between the agglutination titre and the ß-globulin level.The literature on the nature of the rheumatoid factor is reviewed and the conclusion reached that it exists naturally as a 19s macroglobulin migrating electrophoretically as a (ß2-globulin but that transformation to a 22s γ-globulin occurs when serum is stored in the liquid stateBased on this conclusion and on the three-fold relationship observed between the severity of "Caplan lesions", the haemagglutination titre and the p-globulin level, a hypothesis is proposed that the nodular pulmonary lesions described by Caplan and perhaps some other lesions associated with rheumatoid arthritis such as subcutaneous necrobiotic nodules may be sites of synthesis of the rheumatoid factor. It is further suggested that the raw material for this synthesis may consist of ß-glycoprotein derived from the ground-substance of degenerating collagenous tissue.Observations consistent with this hypothesis are quoted from the literature and several experiments are suggested which, if done, might support or refute the hypothesis

Experimental Applications of Automatic Test Markup Language (ATML)

The authors describe challenging use-cases for Automatic Test Markup Language (ATML), and evaluate solutions. The first case uses ATML Test Results to deliver active features to support test procedure development and test flow, and bridging mixed software development environments. The second case examines adding attributes to Systems Modelling Language (SysML) to create a linkage for deriving information from a model to fill in an ATML document set. Both cases are outside the original concept of operations for ATML but are typical when integrating large heterogeneous systems with modular contributions from multiple disciplines

Search for d^* Dibaryon by Double-radiative Capture on Pionic Deuterium

We report a search for d^* dibaryon production by double-radiative capture on pionic deuterium. The experiment was conducted at the TRIUMF cyclotron using the RMC cylindrical pair spectrometer, and detected gamma-ray coincidences following pion stops in liquid deuterium. We found no evidence for narrow dibaryons, and obtained a branching ratio upper limit, BR < 6.7 times 10^{-6} (90% C.L.), for narrow d^* production in the mass range from 1920 to 1980 MeV. Replaced with Physics Letter B accepted version and corrected normalization.Comment: 9 pages, 4 figure

The hyperfine transition in light muonic atoms of odd Z

The hyperfine (hf) transition rates for muonic atoms have been re-measured for select light nuclei, using neutron detectors to evaluate the time dependence of muon capture. For $^{19}$F $\Lambda$$_{h}$ = 5.6 (2) $\mu$s$^{-1}$ for the hf transition rate, a value which is considerably more accurate than previous measurements. Results are also reported for Na, Al, P, Cl, and K; that result for P is the first positive identification.Comment: 12 pages including 5 tables and 4 figures, RevTex, submitted to Phys. Rev.

Test of isospin symmetry via low energy 1^1H(π−\pi^-,πo\pi^o)nn charge exchange

We report measurements of the $\pi^- p \to \pi^o n$ differential cross sections at six momenta (104-143 MeV/c) and four angles (0-40 deg) by detection of $\gamma$-ray pairs from $\pi^o \to \gamma \gamma$ decays using the TRIUMF RMC spectrometer. This region exhibits a vanishing zero-degree cross section from destructive interference between s-- and p--waves, thus yielding special sensitivity to pion-nucleon dynamics and isospin symmetry breaking. Our data and previous data do not agree, with important implications for earlier claims of large isospin violating effects in low energy pion-nucleon interactions.Comment: 5 pages, 3 figures, submitted to Physical Review Letter

Ortho-para transition rate in μ\mu-molecular hydrogen and the proton's induced pseudoscalar coupling gpg_p

We report a measurement of the ortho-para transition rate in the p$\mu$p molecule. The experiment was conducted at TRIUMF via the measurement of the time dependence of the 5.2 MeV neutrons from muon capture in liquid hydrogen. The measurement yielded an ortho-para rate $\Lambda_{op} = (11.1 \pm 1.7 \pm^{0.9}_{0.6}) \times 10^4$ s$^{-1}$ that is substantially larger than the earlier result of Bardin {\it et al.} We discuss the striking implications for the proton's induced pseudoscalar coupling $g_p$.Comment: 4 pages, 3 figures, submitted to Phys. Rev. Let