A Fast Track Trigger for the H1 collaboration Schöning, A.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2004, Letnik:
518, Številka:
1
Journal Article
Recenzirano
A new Fast Track Trigger was built for the H1 Experiment at the electron–proton collider HERA. This trigger allows the full three-dimensional reconstruction of all charged tracks measured in the ...central drift chamber within 25
μs. Particles are reconstructed down to 100
MeV in a high track multiplicity environment with a momentum resolution of better than 3% for 1
GeV tracks. This new device is thus ideally suited to trigger on exclusive final states by identifying particle resonances in e.g. open heavy quark or vector meson production. The trigger makes use of highly parallel track reconstruction algorithms implemented in modern electronics by exploiting high density FPGAs with embedded content addressable memory functionalities for track linking and Floating Point DSPs for track fitting. First results from the commissioning of the frontend system are presented.
Abstract
Pelvic Organ Prolapse (POP) is a rare condition during pregnancy. If all conservative treatments fail, the surgical approach has proven to be in non-pregnant women a very good option due to ...high efficacy and a very low morbidity and mortality rate. We are reporting on the clinical results of a 33-year-old pregnant woman with a past history of laparoscopic sacrohysteropexy who delivered by caesarean section due to a foetal breech presentation. There are only a handful of cases reporting the outcome “pregnancy” after a laparoscopic sacrohysteropexy. Nevertheless, this appears to be a useful intervention for women with a POP unresponsive to conservative treatment and open family planning. Further studies with long-term follow-ups are required to confirm this.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS ...collaborations at HERA for neutral and charged current ... scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb... and span six orders of magnitude in negative four-momentum-transfer squared, ..., and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in ... An extraction of ... and results on electroweak unification and scaling violations are also presented.
Abstract
Introduction:
Chylomicronemia syndrome (CS) is a rare disorder characterized by a high level of triglycerides in plasma. We present a case of a pregnant woman with a severe acute ...pancreatitis (AP) affected by a CS.
Case:
A 38-year-old gravida 2, para 0 with an uneventful course of pregnancy was referred with an AP at 37 0/7 weeks of gestation. This diagnosis was made from a nearby hospital where the chemical analysis showed elevated pancreatic enzymes with significant hypertriglyceridemia. Because of a pathological fetal heart tracing a caesarean delivery was performed. The APGAR score of the female newborn was 5/8/8 at 1, 5 and 10 minutes, respectively. The pH from the umbilical cord were 7.26 (artery) and 7.59 (vein). Once transferred to our intensive care unit a computer tomography scan confirmed an onset of a necrotizing AP. A conservative treatment was tried without success. For this reason a surgical debridement of the infected and necrosic parts was performed. After a long hospitalisation the patient could be dismissed after 2.5 months in good general condition.
Discussion:
Lipid profile changes in normal pregnancy are characterized by an elevation of total plasma cholesterol and triglyceride levels. This is normally caused by an increased liver synthesis of triglycerides in response to elevated estrogen levels. When a CS is diagnosed the main goal is to maintain fasting triglyceride levels at less than 500 mg/dL to reduce the risk for AP.
Conclusion:
Practitioners have an important role in evaluating chylomicronemic patients and implementing therapeutic lifestyle and pharmaceutic interventions aimed to reduce the risk for AP.
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