Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of microwave propagation effects using two-dimensional electrooptic field mapping techniques (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 919-932 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In high-speed electronic devices and monolithic microwave and millimetrewave integrated circuits the propagation of electromagnetic waves plays an important role. In so-called travelling wave devices and circuits these propagation effects are applied to design and realize functions not available in lumped elements. In order to exploit fully the potential of wave propagation effects, experimental investigations have to be carried out which, however, require a measurement technique to allow spatially resolved detection of microwave potential or field distributions inside elements and circuits and along the electrical interconnects. In this paper, it is shown by several examples, that the two-dimensional electrooptic field mapping technique is an excellent tool to study wave propagation effects up to millimetrewave frequencies, with submicrometre spatial resolution and without electromagnetic interference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00820157
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Langzeitergebnisse nach koronarer Thrombendarteriektomie (1999)
    Springer
    Zeitschrift für Herz-, Thorax- und Gefässchirurgie 13 (1999), S. 95-99 
    Details
    ISSN: 0930-9225
    Keywords: Schlüsselwörter Bypasschirurgie ; koronare Thrombendarteriektomie ; Langzeitergebnisse ; Key words Coronary surgery ; endarterectomy ; long-term results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Coronary endarterectomy (EA=TEA) is an additive method in coronary revascularization. Although some surgeons report excellent results, most cardio-thoracic surgeons try to avoid it.  The aim of this study was to examine the clinical outcome of patients, in whom EA had been performed.  A questionnaire was sent to all patients and their physicians one year after the coronary TEA operation. Additionally, coronary angiographic studies were performed in patients with TEA of the LAD (LAD=RIVA). 86 patients (19 females and 67 males) were studied; mean age was 61 years. There were 29 TEA of the LAD and 57 TEA of the RCA. Thirty days mortality was 7% compared to 1.8% in elective patients without EA. Mortality after EA of the LAD was twice as high as after EA of the RCA. Perioperative infarction on the other hand was equal.  After one year, 45 patients were alive and doing well; 70% of the patients reached NYHAI. The LAD was, except for one case, restenosed. In 69% there was occlusion of the LAD, yet in most of the cases the patients were in NYHAI.  According to our study we would recommend avoidance of TEA, since it has a markedly higher incidence of perioperative infarct and mortality despite the use of anticoagulation, TEA of the LAD has a very high reocclusion rate.
    Notes: Zusammenfassung Die koronare Thrombendarteriektomie (TEA) stellt bei Patienten mit schwerer diffuser Dreigefäßerkrankung zusätzlich zur aortokoronaren Bypassanlage eine Möglichkeit der koronaren Revaskularisation dar und wird wegen hoher operativer Mortalität und Infarktraten in der Literatur unterschiedlich beurteilt.  86 Patienten (19 Frauen und 67 Männer) wurden im Rahmen einer koronaren Revaskularisationsoperation thrombendarteriektomiert. 29 TEA des Ramus interventricularis anterior (RIVA) und 57 TEA der rechten Koronararterie (Right coronary artery-RCA) wurden durchgeführt. Die 30-Tage-Mortalität war deutlich höher als nach koronarer Revaskularisation ohne TEA (7% vs. 1,8%).  Alle thrombendarteriektomierten Patienten (n=86) wurden nach 18 Monaten kardiologisch untersucht und in ausgewählten Fällen kontrollangiographiert.  45 Patienten lebten noch und befanden sich zu 70% im NYHA-Stadium1. Die Patienten nach TEA des RIVA zeigten bis auf eine Ausnahme erneute Stenosen oder Verschlüsse (70% der Patienten).  Aus unseren Ergebnissen läßt sich ableiten, daß die koronare Thrombendarteriektomie für den Patienten eine erhöhte perioperative Gefährdung darstellt, ohne die Durchgängigkeit des Gefäßes langfristig wiederherzustellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003980050064
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    RIS-Modalitäten-Interfaces Von proprietären Lösungen zum DICOM-Worklist-Management (1999)
    Springer
    Der Radiologe 39 (1999), S. 286-291 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Workflow ; Worklist-Management ; RIS-Modalitätenkopplung ; PACS ; Key words Workflow ; Worklist management ; RIS-modality interface ; PACS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Radiologic information systems (RIS) and picture archiving and communication systems (PACS) are becoming increasingly widespread. This leads to new demands on the integration of the individual, formerly independent information systems (RIS, modalities, PACS). Possible ways of integrating individual systems are introduced. Besides the detailed description of different realizations of system communication, its role in the PACS at the university hospital in Freiburg is explained. The integration of different information systems still requires the use of proprietary interfaces. An appropriate integration generally has been realized in Freiburg. In the near future DICOM basic worklist management will standardize system integration and render an interdepartmental workflow concept possible. Even though an available communication standard exists, not all problems in the RIS-modality interface are solved. Different data models in the various RI systems and modalities demand certain degrees of freedom in the standard. Thus a satisfactory workflow cannot be guaranteed even when all involved systems conform with the standard.
    Notes: Zusammenfassung Hintergrund: Die zunehmende Verbreitung von Radiologischen Informationssystemen (RIS) und Picture Archiving and Communication Systems (PACS) in den letzten Jahren stellt neue Anforderungen an die Integration der einzelnen, ehemals voneinander unabhängigen Informationssysteme (RIS, Modalitäten, PACS). Im Folgenden werden die Möglichkeiten zur Integration der einzelnen Systeme dargestellt. Ergebnisse: Neben einer Beschreibung der Möglichkeiten zur Systemkommunikation wird aufgezeigt, wie diese im PACS des Universitätsklinikums Freiburg eingesetzt werden. Das DICOM-Basic-Worklist-Management wird detailliert dargestellt. Die Integration der verschiedenen Informationssysteme ist heute nur durch die Verwendung von proprietären Schnittstellen möglich. Eine entsprechende Lösung wurde in Freiburg durchgehend realisiert. Zukünftig wird das DICOM-Basic-Worklist-Management die Systemintegration standardisieren und die Realisierung eines abteilungsübergreifenden Workflow-Konzepts ermöglichen. Diskussion: Obwohl nun ein Kommunikationsstandard verfügbar ist, sind noch nicht alle Probleme bei der RIS-Modalitätenkopplung gelöst. Die unterschiedlichen Datenmodelle in den verschiedenen RI-Systemen und Modalitäten erfordern gewisse Freiheitsgrade im Standard. Deshalb kann ein in allen Punkten zufriedenstellender Workflow nicht garantiert werden, selbst wenn alle beteiligten Systeme dem Standard entsprechen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050511
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Moderne Netztechnologien für die Datenkommunikation im Krankenhaus (1999)
    Springer
    Der Radiologe 39 (1999), S. 292-297 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter ATM ; Ethernet switching ; Policy-based networking ; Key words ATM ; Ethernet switching ; Policy-based networking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Modern network technologies provide the basic infrastructure for information and communication systems in the hospital today. The goal to build up a universal network infrastructure which meets the broadly varied requirements. Analysis of data communication in the hospital and the evaluation of established network technologies, as well as new developments, leads to the switching concept as the suitable solution. Two technologies play the major role in building enterprise networks: the Ethernet family, based on frame switching, and ATM, based on cell switching. Orientation on established standards is the key to free system choice and grants interoperability between systems from different manufacturers. However, the network design must meet the application and system architecture of the information technology in order to achieve successful mapping of the involved communication profiles. This means scaling of the bandwidth as needed, suitable segmenting of the network and resilient links. In a further step, policy-based networking takes advantages of prioritizing critical applications and therefore reduces interdependencies across the network.
    Notes: Zusammenfassung Hintergrund: Moderne Netztechnologien bilden heute das Rückgrat für Informations- und Kommunikationssysteme im Krankenhaus. Ziel ist es, eine möglichst universelle Netzwerkinfrastruktur zu konzipieren, die das breit gefächerte Anforderungsprofil abdecken kann. Methode: Eine Bedarfsanalyse zur Datenkommunikation im Krankenhaus und die Sondierung etablierter Netztechnologien sowie neuer Entwicklungen führen zum Switching-Konzept als dem geeigneten Lösungsansatz. 2 Ausprägungen, die Ethernet-Familie auf der Basis von Frame switching und ATM auf der Basis von Cell switching, werden die tragende Rolle im Netzwerk einnehmen. Diskussion: Bei der Auswahl von Komponenten ist die Orientierung an etablierten Standards wichtige Voraussetzung für die Interoperabilität zwischen Systemen unterschiedlicher Hersteller. Letztlich ist aber zu einer erfolgreichen Abbildung der anfallenden Kommunikationsprofile ein auf die konkret vorhandene Anwendungs- und Systemarchitektur abgestimmtes Netzdesign entscheidend. Es berücksichtigt eine bedarfsgerechte Skalierung der Bandbreite, eine geeignete Segmentierung des Netzwerks und die Bildung redundanter Kommunikationspfade zur Ausfallssicherheit. Applikationen auf dem Netzwerk priorisieren zu können (policy-based networking) ist ein weiterer vielversprechender Schritt, um kritische Anwendungen auszuzeichnen und die Abhängigkeiten voneinander abzufedern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050512
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Molecular basis for cross-reactivity between a strain ofMycobacterium terrae and DNA probes forMycobacterium tuberculosis complex (1995)
    Springer
    European journal of clinical microbiology & infectious diseases 14 (1995), S. 627-629 
    Details
    ISSN: 1435-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01690741
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Exact and Analytical Methods for Finding Complex Roots of Moving Waveguides with Absorbing Layers (1999)
    Springer
    International journal of infrared and millimeter waves 20 (1999), S. 725-735 
    Details
    ISSN: 1572-9559
    Keywords: Moving waveguides ; Numerical techniques ; Integrated optics ; Maxwell's and Minkowski's equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present here two methods of analysis of the complex moving waveguide. One approach is a numerical technique based on Davidenko's method, the other is a perturbation method. Numerical results by Davidenko's method are compared with these obtained from the perturbation method. It is found that the results of the perturbation method are in a good agreement with the numerical one. A comparative study of the propagation and attenuation characteristics of the stationary and moving waveguides has also been investigated and discussed. These results could be used in designing many optical moving sensors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022613210948
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Metal-Clad Multilayer Waveguide: Circle-Chain Convergent Method and Two Perturbation Methods (1999)
    Springer
    International journal of infrared and millimeter waves 20 (1999), S. 1425-1440 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Computer modeling studies for the calculation of the propagation constants and attenuation coefficients of TE mode in an asymmetric metal/ dielectric/dielectric layers structure are presented. Two different perturbation methods, circle chain convergent method and Downhill method are used. The last two methods can be used easily for the waveguides consist of any number of layers with complex refractive index due to gain and loss. The developed programs were run on a personal computer and numerical results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021739314903
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    A Perturbation Method for Complex Root Finding of Nonlinear Electromagnetic Waves (1999)
    Springer
    International journal of infrared and millimeter waves 20 (1999), S. 1389-1402 
    Details
    ISSN: 1572-9559
    Keywords: Nonlinear TE waves ; Lossy waveguides ; Numerical and perturbations techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Aspects of the perturbation method are presented and implemented on the analytic function of the complex variable for the propagation of nonlinear electromagnetic surface guided by a thin film. The behavior of nonlinear TE waves guided by asymmetrical dielectric thin film, bounded by a generalizes nonlinear substrate with a permittivity of the form ɛ ∼ | E |δ is analyzed. The complex roots, which correspond to the propagation and attenuation coefficient are obtained and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021783029924
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...