The article describes the commissioning and technical development of the Weak Interaction Studies with 32Ar Decay (WISArD) experiment, installed at the radioactive ion-beam facility ISOLDE/CERN. The ...experiment aims to extend the present limits on scalar and tensor currents in the weak interaction and hence search for physics beyond the Standard Model. The evaluation of these limits relies on measuring the proton energy in beta-delayed proton emission, sensitive to both the beta-neutrino angular correlation coefficient aβν and the Fierz interference term b. The method tries to improve previous studies by considering the positron-proton coincidences when determining the kinematic shift in the energy of the emitted protons. Using this coincidence technique, the aβν and b coefficients will be measured at the per mil level. Simulations were employed to optimize the ion beam transport efficiency and validate proof-of-principle results obtained in November 2018 (Nov2018). Upgrades are ongoing, and we are looking into improvements to the overall performance of the setup.
The Cabibbo-Kobayashi-Maskawa quark mixing matrix currently does not satisfy unitarity at the 2 σ -level. This could be the result of an inaccurate value of one or both of its largest matrix elements ...V us and V ud . In the case of V ud , the most precise measurement is obtained from the f t -value measurements of superallowed beta-transitions between 0 + states. The accuracy of this determination can, in turn, be tested by extracting V ud in other transitions including superallowed transitions between mirror nuclei. The Superallowed Transition Beta-Neutrino Decay Ion Coincidence Trap (St. Benedict) is currently under construction at the Nuclear Science Laboratory of the University of Notre Dame to perform such a determination, with the goal of shedding more light on this tension with unitarity. St. Benedict will take a radioactive ion beam produced by TwinSol , thermalize it in a large volume gas catcher, then transport it in two separate differentially-pumped volumes using a radio-frequency (RF) carpet and a radio-frequency quadrupole (RFQ) ion guide before injecting it in an RFQ trap to create cool ion bunches for injection in the measurement Paul trap. In this paper, we detail the installation of the beam preparation components of St. Benedict, and present the results of the first RIBs successfully stopped and extracted from its gas catcher.
Introduction Symptomatic chondral defects in the knee can be devastating injuries to the competitive skier. Outcomes after microfracture in these high-impact athletes have not been previously ...reported. The purpose of this study was to evaluate results of microfracture in the professional skier. Methods Twenty active elite skiers having undergone knee microfracture surgery performed by two surgeons at our institution between 1986 and 2008 were included in this study. Demographic data were obtained for each patient, along with outcome scores and objective performance data. Results Twenty patients (23 knees) with an average age of 23.1 years (range: 15-29) were studied (16 female, 4 male). Follow-up information was available on 20 knees with a minimum follow-up of 2 years (87%). Average time from microfracture surgery to final follow-up was 77 months (range: 24-255). Mean lesion size was 155 mm2 (range: 5-450 mm2 ). One knee underwent microfracture of a bipolar lesion. Twenty-two of 23 knees (96%) returned to competitive skiing. Average return to competition was 13.4 months (range: 0.5-25.3). Mean patient satisfaction scores were 9.8 (range: 6-10). Mean Tegner and Lysholm scores were 8 (range: 3-10) and 86 (range: 41-100), respectively. Conclusion Patients with symptomatic chondral lesions of the knee can return to a high level of competition following microfracture surgery. Ultimately, 22 of 23 (96%) knees were able to return to ski racing. Microfracture is a reliable method of treating chondral lesions in these high-impact athletes.
En ayant en tête les questionnements des cliniciens de terrain, les auteurs s'efforcent de présenter les concepts et données actuelles de la psychodynamique et de la psychopathologie ...(psychotraumatologie comprise) du travail. L'accent est placé sur la subjectivité telle qu'elle est perçue à travers l'approche clinique compréhensive, en opposition aux disciplines comportementalistes objectivantes. L'abord historique de la littérature sert d'introduction au balayage des principales catégories cliniques rencontrées en psychopathologie du travail. Enfin, est abordée la dimension collective des approches en psychotraumatologie et psychodynamique du travail.
Keeping in mind the interrogations of clinical practitioners and researchers, the authors present current concepts and data that characterize occupational psychodynamics and psychopathology (psychotraumatology inclusively). Emphasis is put on the subjectivity as it is perceived in a clinical integrative-understanding approach, as opposed to objectivizing behavioural methods. A historical analysis of the literature introduces the review of main clinical categories encountered in occupational psychopathology. Finally, the trans-individual dimension of psychotraumatology and psychodynamics is evoked.
Thin films of SiGe were prepared on SiO
2 by low pressure chemical vapor deposition (LPCVD) from SiH
4 and GeH
4. With this technique there is in situ control of incorporation of germanium in SiGe ...films. In the deposition conditions, films of Si
1−
x
Ge
x
are deposited amorphous. The parameters of crystallization kinetics of amorphous films are studied by in situ measurements of the film conductance during annealing (around 575°C). We show that increasing total deposition pressure modifies the crystallization of amorphous SiGe films and increases the crystallization time,
t
c, of the layers. The structural properties are determined by X-ray diffraction (XRD) and the incorporation of germanium is determined by secondary ion mass spectroscopy (SIMS) and conductivity versus temperature. The quality of the layers is studied by electrical measurements. The Hall effect measurement shows that the quality of the polycrystalline SiGe films obtained after crystallization of amorphous layers depends on annealing temperature and total deposition pressure, which determines the crystallization mode.
The nationalist projects of the Latin American countries in the 19th century are only recently beginning to receive the attention they deserve. Despite the silence on customary law in 19th century ...nationalist discourse, recent archival research documents its unspoken influence. Guillet examines the conjuncture of forces in Peru's nationalist project that kept customary law from emerging. He compares the treatment of customary law in Spain and Peru over the same period and in similar arenas.
For about fifty years, from the turn of the twentieth century until the 1950s, farmers in the region of the Orbigo River in northwestern Spain lifted groundwater for irrigation. Two quite different ...forms of property rights emerged during this period. In the Orbigo valley, small groups of farmers held the majority of water-lifting devices and groundwater as common property. Water was divided into timeshares and shares were taken in rotation. On a high plain above, farmers held water-lifting devices and groundwater as private property. Why did two different forms of property rights emerge in this place at this time? In addressing this question, a new approach to understanding institutional change is proposed, based on a synthesis of schema theory and the economics of institutions.
