Search results for: Thomas Rauch

Items from 1 to 16 out of 16 results

article

MCP detector development for UV space missions

Lauro Conti, Jürgen Barnstedt, Lars Hanke, Christoph Kalkuhl, more

Astrophysics and Space Science > 2018 > 363 > 4 > 1-8

We are developing imaging and photon counting UV-MCP detectors, which are sensitive in the wavelength range from far ultraviolet to near ultraviolet. A good quantum efficiency, solar blindness and high spatial resolution is the aim of our development. The sealed detector has a Cs-activated photoactive layer of GaN (or similarly advanced photocathode), which is operated in semitransparent mode on (001)-MgF...

chapter

Detection of ultra-hot pre-white dwarfs

Klaus Werner, Thomas Rauch, Stefan Dreizler, Ulrich Heber

Lecture Notes in Physics > White Dwarfs > 171-175

chapter

HST Spectroscopy of the Hottest White Dwarfs

Thomas Rauch, Klaus Werner

Astrophysics and Space Science Proceedings > The Impact of HST on European Astronomy > Stars, Star Formation, Stellar Populations and Planets > 11-14

Spectral analysis needs the observation of lines of successive ionization stages in order to evaluate the ionization equilibrium (of a particular species) which is a sensitive indicator for the effective temperature (T _eff). Since stars with T _eff as high as 100,000 K have their flux maximum in the extreme ultraviolet (EUV) wavelength range and due to the high degree of ionization,...

article

2-year efficacy and safety of linagliptin compared with glimepiride in patients with type 2 diabetes inadequately controlled on metformin: a randomised, double-blind, non-inferiority trial

Baptist Gallwitz, Julio Rosenstock, Thomas Rauch, Sudipta Bhattacharya, more

The Lancet > 2012 > 380 > 9840 > 475-483

Addition of a sulphonylurea to metformin improves glycaemic control in type 2 diabetes, but is associated with hypoglycaemia and weight gain. We aimed to compare a dipeptidyl peptidase-4 inhibitor (linagliptin) against a commonly used sulphonylurea (glimepiride). In this 2-year, parallel-group, non-inferiority double-blind trial, outpatients with type 2 diabetes and glycated haemoglobin A _1c...

article

Linagliptin Increases Incretin Levels, Lowers Glucagon, and Improves Glycemic Control in Type 2 Diabetes Mellitus

Thomas Rauch, Ulrike Graefe-Mody, Carolyn F. Deacon, Arne Ring, more

Diabetes Therapy > 2012 > 3 > 1 > 1-14

Introduction Linagliptin is a xanthine-based dipeptidyl peptidase (DPP)-4 inhibitor that is now available in numerous countries worldwide for the treatment of type 2 diabetes mellitus (T2DM). The aim of this study was to evaluate further the mechanisms underlying the improvements in glycemic control observed with linagliptin. The effects of linagliptin on DPP-4, pharmacodynamic parameters, and glycemic...

article

EC 11481–2303—a peculiar subdwarf OB star revisited

Thomas Rauch, Klaus Werner, Jeffrey W. Kruk

Astrophysics and Space Science > 2010 > 329 > 1-2 > 133-139

EC 11481–2303 is a peculiar, hot, high-gravity pre-white dwarf. Previous optical spectroscopy revealed that it is a sdOB star with T _eff=41 790 K, log g=5.84, and He/H = 0.014 by number. We present an on-going spectral analysis by means of non-LTE model-atmosphere techniques based on high-resolution, high-S/N optical (VLT-UVES) and ultraviolet (FUSE, IUE) observations. We are able to reproduce the...

article

Non-LTE modeling of supernova-fallback disks

Klaus Werner, Thorsten Nagel, Thomas Rauch

Astrophysics and Space Science > 2007 > 308 > 1-4 > 141-149

We present a first detailed spectrum synthesis calculation of a supernova-fallback disk composed of iron. We assume a geometrically thin disk with a radial structure described by the classical α-disk model. The disk is represented by concentric rings radiating as plane-parallel slabs. The vertical structure and emission spectrum of each ring is computed in a fully self-consistent manner by solving...

article

AA Dor—An Eclipsing sdOB—Brown Dwarf Binary

Thomas Rauch

Astrophysics and Space Science > 2004 > 291 > 3 > 275-282

AA Dor is an eclipsing, close, post common-envelope binary (PCEB) consisting of a sdOB primary star and an unseen secondary with an extraordinary small mass (M 2≈ 0.066 M ⊙)—formally a brown dwarf. The brown dwarf may have been a former planet which survived a common envelope (CE) phase and has even gained mass. A recent determination of the components' masses from results of NLTE spectral analysis...

article

AA Dor—An Eclipsing sdOB—Brown Dwarf Binary

Thomas Rauch

Astrophysics and Space Science > 2004 > 291 > 3-4 > 275-282

AA Dor is an eclipsing, close, post common-envelope binary (PCEB) consisting of a sdOB primary star and an unseen secondary with an extraordinary small mass (M ₂≈ 0.066 M _⊙)—formally a brown dwarf. The brown dwarf may have been a former planet which survived a common envelope (CE) phase and has even gained mass. A recent determination of the components’ masses from results of NLTE spectral analysis...

article

Effectiveness of two radiofrequency ablation systems in atrial tissue

Ulrich O. von Oppell, Thomas Rauch, Gerhard Hindricks, Hans Kottkamp, more

European Journal of Cardio-Thoracic Surgery > 2001 > 20 > 5 > 956-960

Objective: The efficacy of the left atrial radiofrequency ablation procedure, for the curative treatment of atrial fibrillation, is dependent upon obtaining a confluent transmural line of hyperthermic cellular death. We compare the in vitro effectiveness of obtaining transmural hyperthermic cellular death (>55 ^o C) of both the Osypka single electrode and Boston Scientific Thermaline multi-electrode...

article

Patientenadaptierte Klappenselektion: biologischer vs. mechanischer Herzklappenersatz bei Aortenklappenvitien

Stefan Brose, Rdiger Autschbach, Thomas Rauch, Mark Engel, more

Clinical Research in Cardiology > 2001 > 90 > S6 > VI48-VI57

Zusammenfassung Die operative Versorgung von Aortenklappenvitien durch Ersatz der nativen Klappe mit einer Herzklappenprothese hat sich seit der ersten Operation im Jahre 1960 durch Harken zu einer der am hufigsten durchgefhrten Eingriffe in der Herzchirurgie entwickelt. Fr den Klappenersatz stehen biologische (Xenografts und Homografts) und mechanische Herzklappenprothesen zur Verfgung. Bei der Auswahl...

article

Extracellular matrix gene expression correlates to left ventricular mass index after surgical induction of left ventricular hypertrophy

Andreas Schubert, Thomas Walther, Volkmar Falk, Christian Binner, more

Basic Research in Cardiology > 2001 > 96 > 4 > 381-387

Abstract The cardiac extracellular matrix (ECM) is a dynamic entity maintaining the structural and functional properties of the myocardium. Little is known about alterations in ECM regulation during controlled induction of compensated left ventricular hypertrophy (LVH) using experimental aortic stenosis. Fifteen growing sheep received supra-coronary banding at an age of 7 1 months whereas 10 age-matched...

article

Patientenadaptierte Klappenselektion: biologischer vs. mechanischer Herzklappenersatz bei Aortenklappenvitien

Stefan Brose, Rüdiger Autschbach, Mark Engel, Thomas Rauch, more

Zeitschrift für Kardiologie > 2001 > 90 > 6 > 48-57

Die operative Versorgung von Aortenklappenvitien durch Ersatz der nativen Klappe mit einer Herzklappenprothese hat sich seit der ersten Operation im Jahre 1960 durch Harken zu einer der am häufigsten durchgeführten Eingriffe in der Herzchirurgie entwickelt. Für den Klappenersatz stehen biologische (Xenografts und Homografts) und mechanische Herzklappenprothesen zur Verfügung. Bei der Auswahl der geeigneten...

article

Endothelial function of human vena saphena magna prepared with different minimally invasive harvesting techniques

Alexander M. Fabricius, Andreas Oser, Anno Diegeler, Thomas Rauch, more

European Journal of Cardio-Thoracic Surgery > 2000 > 18 > 4 > 400-403

Objectives: Minimally invasive saphenous harvesting techniques have been shown to reduce post-operative morbidity. However, when applying new techniques of vein harvesting, endothelial integrity should be preserved in order to guarantee graft quality. We investigated the impact of two different minimally invasive saphenous vein harvesting techniques on endothelial function compared with the traditional...

article

Neuromonitoring and neurocognitive outcome in off-pump versus conventional coronary bypass operation

Anno Diegeler, Robert Hirsch, Felix Schneider, Lars-Oliver Schilling, more

The Annals of Thoracic Surgery > 2000 > 69 > 4 > 1162-1166

Background. Cardiopulmonary bypass seems to be a major cause for both intraoperative microemboli and cerebral hypoperfusion. This study investigates high intensive transient signals (HITS) in transcranial Doppler ultrasound (TCD) and serum levels of the neurobiochemical marker protein S-100 in patients who underwent coronary artery bypass operation without cardiopulmonary bypass (off-pump CABG) in...

article

Comparison of different anticalcification treatments for stentless bioprostheses

Thomas Walther, Volkmar Falk, Rüdiger Autschbach, Anno Diegeler, more

The Annals of Thoracic Surgery > 1998 > 66 > 6 Supplement 1 > S249-S254

Background. New anticalcificant treatments have been developed because tissue calcification is a major contributing factor for bioprosthetic valve failure.Methods. Aortic valve leaflet and aortic root tissue samples from stentless bioprostheses treated with No-React (Biocor, Belo Horizonte, Brazil), AOA (Medtronic freestyle, Minneapolis, MN), and BiLinx (St. Jude Medical, St. Paul, MN) were compared...

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