2,028 research outputs found
The 64 Mpixel wide field imager for the Wendelstein 2m Telescope: Design and Calibration
The Wendelstein Observatory of Ludwig Maximilians University of Munich has
recently been upgraded with a modern 2m robotic telescope. One Nasmyth port of
the telescope has been equipped with a wide-field corrector which preserves the
excellent image quality (< 0.8" median seeing) of the site (Hopp et al. 2008)
over a field of view of 0.7 degrees diameter. The available field is imaged by
an optical imager (WWFI, the Wendelstein Wide Field Imager) built around a
customized 2 2 mosaic of 4k 4k 15 \mu m e2v CCDs from
Spectral Instruments. This paper provides an overview of the design and the
WWFI's performance. We summarize the system mechanics (including a structural
analysis), the electronics (and its electromagnetic interference (EMI)
protection) and the control software. We discuss in detail detector system
parameters, i.e. gain and readout noise, quantum efficiency as well as charge
transfer efficiency (CTE) and persistent charges. First on sky tests yield
overall good predictability of system throughput based on lab measurements.Comment: 38 pages 19 Figures To be published in Springer Experimental
Astronom
Europe and the Petersberg Tasks - Nation-State behavior through the prism of Strategic Culture
Les missions Petersberg són l'operatiu militar més ambiciós organitzat per la Unió Europea en el desenvolupament de la CSDP, PolÃtica Europea de Seguretat i Defensa. Amb l'objectiu d'aconseguir una organització efectiva y funcional d'aquestes missions, és desitjable que les cultures estratègiques dels diferents Estats membres siguin, en gran mesura, compatibles en benefici d'una cultura estratègica europea amb directrius clares. Aquest estudi compara les cultures estratègiques d'Alemanya, el Regne Unit i França en referència al seu nivell de compatibilitat contrastant-les amb dos casos recents, exemples paradigmà tics de cultures estratègiques integrals. D'aquesta manera, pretenem descriure les circumstà ncies en què es desenvolupen les missions Petersberg.The Petersberg Tasks is the most ambitious set of operational tasks the EU has set itself in the development of the CSDP. For the practical utility of this set of tasks, it can be expected that the strategic cultures of the member states have to be compatible to a large extent in order to create a European strategic culture with a clear conception. This study compares the strategic cultures of Germany, the United Kingdom and France in respect of their compatibility by testing a comprehensive paradigm of strategic culture in two recent cases, offering the circumstances of conducting the Petersberg Tasks
Surgical management of laryngotracheal stenosis in adults
The purpose was to evaluate the outcome following the surgical management of a consecutive series of 26 adult patients with laryngotracheal stenosis of varied etiologies in a tertiary care center. Of the 83 patients who underwent surgery for laryngotracheal stenosis in the Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital of Lausanne, Switzerland, between 1995 and 2003, 26 patients were adults (≥16years) and formed the group that was the focus of this study. The stenosis involved the trachea (20), subglottis (1), subglottis and trachea (2), glottis and subglottis (1) and glottis, subglottis and trachea (2). The etiology of the stenosis was post-intubation injury ( n =20), infiltration of the trachea by thyroid tumor ( n =3), seeding from a laryngeal tumor at the site of the tracheostoma ( n =1), idiopathic progressive subglottic stenosis ( n =1) and external laryngeal trauma ( n =1). Of the patients, 20 underwent tracheal resection and end-to-end anastomosis, and 5 patients had partial cricotracheal resection and thyrotracheal anastomosis. The length of resection varied from 1.5 to 6cm, with a median length of 3.4cm. Eighteen patients were extubated in the operating room, and six patients were extubated during a period of 12 to 72h after surgery. Two patients were decannulated at 12 and 18months, respectively. One patient, who developed anastomotic dehiscence 10days after surgery, underwent revision surgery with a good outcome. On long-term outcome assessment, 15 patients achieved excellent results, 7 patients had a good result and 4 patients died of causes unrelated to surgery (mean follow-up period of 3.6years). No patient showed evidence of restenosis. The excellent functional results of cricotracheal/tracheal resection and primary anastomosis in this series confirm the efficacy and reliability of this approach towards the management of laryngotracheal stenosis of varied etiologies. Similar to data in the literature, post-intubation injury was the leading cause of stenosis in our series. A resection length of up to 6cm with laryngeal release procedures (when necessary) was found to be technically feasibl
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