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Search Results: 1 - 10 of 149248 matches for " F. Jung "
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Dijet azimuthal distributions and initial-state parton showers
Hautmann, F.;Jung, H.
High Energy Physics - Phenomenology , 2008,
Abstract: We investigate angular correlations in multi-jet final states at high-energy colliders and discuss their sensitivity to initial-state showering effects, including QCD coherence and corrections to collinear ordering.
Color coherence in multi-jet final states
Hautmann, F.;Jung, H.
High Energy Physics - Phenomenology , 2008, DOI: 10.1016/j.nuclphysbps.2008.12.008
Abstract: We discuss coherent QCD radiation from space-like parton branching and its effects on multi-jet final states at high-energy hadron colliders. Coherence effects for small longitudinal momentum fractions x are not included in the branching algorithms of standard shower Monte Carlo event generators. On the other hand, they are taken into account only partially in perturbative next-to-leading-order calculations for multi-jets. Such effects are present to all orders in alpha_s and can become logarithmically enhanced with \sqrt{s} / E_T, where E_T is the hardest jet transverse energy. We present results of summing coherence effects to all orders by parton-branching Monte Carlo methods based on transverse-momentum dependent matrix elements.
Jet correlations from unintegrated parton distributions
Hautmann, F.;Jung, H.
High Energy Physics - Phenomenology , 2008, DOI: 10.1063/1.3013083
Abstract: Transverse-momentum dependent parton distributions can be introduced gauge-invariantly in QCD from high-energy factorization. We discuss Monte Carlo applications of these distributions to parton showers and jet physics, with a view to the implications for the Monte Carlo description of complex hadronic final states with multiple hard scales at the LHC.
Rekonstruktive Chirurgie in der Urogenitalregion aus Sicht des Plastischen Chirurgen
Wedler V,Jung F,Künzi W
Journal für Urologie und Urogyn?kologie , 2005,
Abstract: Die Rekonstruktion von Organstrukturen in der urogenitalen Region entspricht den allgemeingültigen infektiologisch-, traumatologisch- und onkologisch-chirurgischen Konzepten mit dem Anspruch der optimalsten funktionellen und sthetischen Wiederherstellung. Die Rekonstruktion bei Malignomen erfolgt innerhalb einer interdisziplin ren Zusammenarbeit zwischen dem Urologen bzw. Gyn kologen, Plastischen Chirurgen und Onkologen, welche nach einem diagnostischen Screening unter Einbezug von prognostischen Faktoren die Operationsindikation in Anlehnung des individuellen kurativen oder palliativen Charakters gemeinsam stellen. Auch Patienten mit Mi bildungen oder mit echtem Transsexualismus mit dem Wunsch einer Geschlechtskonstruktion oder geschlechtsanpassenden Operation stellen aus unserer Sicht für die Zukunft eine konstruktive Zusammenarbeit zwischen dem Urologen bzw. Urogyn kologen und Plastischen Chirurgen dar. In diesem Artikel werden verschiedene Operationstechniken und ihnen zugrundeliegende Prinzipien entsprechend den rekonstruktiven Erfordernissen aus der Sicht des Plastischen Chirurgen mit dem Anspruch, die Patienten frühstm glich zu rehabilitieren, eine notwendige adjuvante Therapie schnellstm glich beginnen zu k nnen und die Hebemorbidit t gegenüber dem Therapieziel m glichst gering zu halten, diskutiert.
Globally singularity-free semi-classical wave functions in closed form
C. Jung,F. Leyvraz,T. H. Seligman
Physics , 2000,
Abstract: We use a factorization technique and representation of canonical transformations to construct globally valid closed form expressions without singularities of semi-classical wave functions for arbitrary smooth potentials over a one-dimensional position space.
The CCFM uPDF evolution uPDFevolv
F. Hautmann,H. Jung,S. Taheri Monfared
Physics , 2014, DOI: 10.1140/epjc/s10052-014-3082-1
Abstract: uPDFevolv is an evolution code for TMD parton densities using the CCFM evolution equation. A description of the underlying theoretical model and technical realization is given together with a detailed program description, with emphasis on parameters the user may want to change
Menopausal hormone therapy after breast cancer: a meta-analysis and critical appraisal of the evidence
Nananda F Col, Jung A Kim, Rowan T Chlebowski
Breast Cancer Research , 2005, DOI: 10.1186/bcr1035
Abstract: In a systematic review of the literature we identified all reports of HT use in breast cancer survivors that included comparison groups. Study design features that might affect selection of participants, detection of recurrence, and manuscript publication were assessed. The relative risks for breast cancer recurrence associated with HT were combined with random effects models.Two randomized and eight observational studies included 1,316 breast cancer survivors who used HT and 2,839 nonusers. In the observational studies, HT users were younger and more commonly node negative; only two reported balanced restaging for HT and control groups. Randomized trials suggest that HT increased the risk for recurrence (relative risk 3.41, 95% confidence interval 1.59–7.33), whereas observational studies suggest that HT decreased this risk (relative risk 0.64, 95% confidence interval 0.50–0.82).Results from observational studies of HT conducted in breast cancer survivors are discrepant with results from randomized trials. Observational studies of HT use in breast cancer survivors have design limitations that cannot be controlled for using standard statistical methods. Therefore, the randomized clinical trial data provide the only reliable estimates of the effect of HT use on recurrence risks in breast cancer survivors.Most breast cancer survivors are menopausal either at diagnosis or as a result of premature therapy-induced menopause, and they frequently experience climacteric symptoms [1]. Menopausal hormone therapy (HT), either with estrogen alone or with combined estrogen and progestin, relieves estrogen deficiency symptoms [2] but it is commonly withheld from women with diagnosed breast cancer because of concerns regarding an increased risk for recurrence [3].The available data from observational studies indicate that use of HT is associated with increased risk for breast cancer [4]. In postmenopausal women, the randomized Women's Health Initiative HT trials found an increased
Nonperturbative corrections and showering in NLO-matched event generators
Dooling, S.;Gunnellini, P.;Hautmann, F.;Jung, H.
High Energy Physics - Phenomenology , 2013,
Abstract: We study contributions from nonperturbative effects and parton showering in NLO event generators, and present applications to jet final states. We find pT-dependent and rapidity-dependent corrections which can affect the shape of observed jet distributions at the LHC. We illustrate numerically the kinematic shifts in longitudinal momentum distributions from the implementation of energy-momentum conservation in collinear shower algorithms.
Epicardial microwave ablation for the treatment of permanent atrial fibrillation: 1-year results of a prospective registry study
M. Knaut,S. Brose,R. Forker,F. Jung
Applied Cardiopulmonary Pathophysiology , 2009,
Abstract: Background: Atrial fibrillation (AF) which is one of the most common arrhythmias is responsible for a high percentage of strokes. Recently simplified ablation procedures became more relevant in the surgical treatment of AF. One advantage of microwave ablation (MW) is, that it can be used epicardially. We report our first clinical results of the use of epicardial MW as a concomitant procedure during cardiac surgery where opening of the left atrium was not required. Methods: Patients who were scheduled for aortic valve replacement and/or coronary artery bypass grafting suffering from permanent AF, were included into the registry. They received epicardial MW as a concomitant procedure during their operation and were followed over a period of one year. The results were compared to the outcome of a historical patient group with equivalent operations without ablation therapy. Epicardial MW was done on extracorporeal circulation on the beating heart creating box lesions around the pulmonary veins with a connection line on the roof of the left atrium and an additional line to the left atrial appendage. Results: 40 patients were treated with epicardial MW in combination with aortic valve replacement and/or coronary artery bypass grafting. Their preoperative data were as follows: age: 69.6±7.8 years, ejection fraction: 55.7±14.2%, left atrial diameter: 46.2±6.0 mm, duration of AF 6.8±9.8 years. The control group comprised 145 patients (age: 72.6±6.9 years, ejection fraction: 49.7±14.8%, left atrial diameter: 47.4±6.6 mm, AF history: 3.7±5.7 years). One year survival rate was 92.5 % in the ablation group and 86.9 % in the control group. We observed no device-related complications. During the follow-up the sinus rhythm rate ranged between 71.4 and 65.7% in the ablated patients in contrast to 7.4 to 9.6% in the control group (p=0.00001).Conclusion: Our results demonstrate that epicardial ablation, in this study with a microwave ablation device, is an effective treatment option for patients with permanent AF. The procedure is less invasive then the endocardial approach and prolongs concomitant heart surgery only minimally without lengthening ischemic time. Epicardial ablation has become part of the daily routine in our institution for the treatment of AF in patients scheduled for bypass grafting and/or aortic valve replacement.
Epicardial microwave ablation of permanent atrial fibrillation during a coronary bypass and/or aortic valve operation: prospective, randomised, controlled, mono-centric study
M. Knaut,S. Kolberg,S. Brose,F. Jung
Applied Cardiopulmonary Pathophysiology , 2010,
Abstract: Atrial fibrillation (AF), one of the most common arrhythmias, is the aetiology behind a high percentage of strokes. Recently simplified ablation procedures became more relevant in the surgical treatment of AF. One advantage of microwave ablation (MW) is that it can be used epicardially. We report our results of a prospective, randomized, controlled, mono centre trail. In two arms, with and without ablation, we treated patients with documented permanent atrial fibrillation with an indication for cardiac surgery, where opening of the left atrium was not required.Methods: Patients, who were scheduled for aortic valve replacement and/or coronary artery bypass grafting suffering from permanent AF, were included in the registry. After inclusion the patients were randomized either to epicardial MW (EMW) as a concomitant procedure during their operation (Group A) or equivalent operations without ablation therapy (group B). Follow-up was one year. EMW was performed under extracorporeal circulation on the beating heart creating a box lesion including the anterior part of the pulmonary veins with connection lines on the roof and bottom of the left atrium and an additional line to the left atrial appendage. Results: 45 patients (17 female/ 28 male) with AVD and/or CAD and pAF were included. Preoperative duration of pAF was 5.2 years (0.1-45 years). Preoperative data were as follows: mean age: 74 years (63-83 years), mean ejection fraction: 56% (30–83%), left atrial diameter: 46.1mm (40-59mm). 20 patients got aortic valve replacement, 17 had CABG, and 8 operations were combined procedures (AVR and CABG).All ablation procedures were performed on-pump beating heart. We observed no device related complications. During the follow-up, restoration of the sinus rhythm rate after one year is 52.4% in the ablated patients in contrast to 10.5% in the control group. The 30-day survival rate in group A was 87.5% and 95.2% in group B (n.s.). Pacemaker implants after one year were required in 12.5 % in group A and 25% in group B. Conclusion: Our results demonstrate that EMW is an effective treatment option for patients with permanent AF. The procedure is less invasive than the endocardial approach and prolongs concomitant heart surgery only minimally without lengthening of the ischemic time. We think, that EMW ablation is a promising concept with a good benefit/risk ratio for the treatment of pAF, especially in patients where opening of the left atrium is not required as part of the original procedure. A more extended lesion line concept, closer to the classic Maze procedure line
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