Library

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
    Springer
    World journal of surgery 12 (1988), S. 724-731 
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des progrès récents ont augmenté les possibilités de diagnostic et les moyens d'investigation vasculaire non invasifs. Ceux-ci comprennent la mesure de la pression partielle en oxygène à travers la peau, la débitométrie par laser Doppler, et la microscopie intravitale avec et sans utilisaton de colorants fluorescents, analysant l'hémodynamique de la peau et la morphologie microvasculaire, la vitesse sanguine capillaire, et l'échange transcapillaire de solutés. De plus, la duplex-sonographie offre la possibilité de détecter des sténoses dans les artères auparavant inaccessibles comme les artères mésentériques et rénales. Cette méthode, associant l'échographie mode B et l'échographie par Doppler pulsé convient également à dessiner la cartographie et à quantifier les lésions occlusives de l'aorte jusqu'aux vaisseaux à mi-mollet avec une précision comparable à celle de l'artériographie. Les implications cliniques de ces nouvelles méthodes sont discutées dans cette revue.
    Abstract: Resumen Recientes avances tecnológicos han incrementado la capacidad diagnóstica del laboratorio vascular. Los nuevos avances incluyen la medici'on de la presión parcial transcutánea de oxígeno, la flujometría con el Doppler de laser (que utiliza luz laser en vez de ultrasonido) y la microscopía intravital con y sin el uso de colorantes fluorescentes, para el análisis de la hemodinamia de la piel y de la morfología microvascular, de la velocidad del flujo capilar, y del intercambio transcapilar de solutos. Además, la escanografía duplex abre una nueva posibilidad para detectar áreas de estenosis en arterias hasta ahora inaccesibles, tales como troncos mesentéricos y renales; la combinación de la ultrasonografía de modo B y con los datos del Doppler hace posible delinear y cuantificar lesiones oclusivas desde la aorta hasta las arterias proximales de la pantorrilla con una certeza similar a la de la arteriografía. En esta revisión se discuten las diferentes implicaciones clínicas de estas novedosas técnicas.
    Notes: Abstract Recent advances in technology have further increased the diagnostic potential of the noninvasive vascular laboratory. They include measurement of transcutaneous oxygen pressure, laser Doppler flowmetry and intravital microscopy with and without the use of fluorescent dyes for analyzing hemodynamics of the skin and microvascular morphology, capillary flow velocity, and transcapillary exchange of solutes. Moreover, duplex scanning opens a way to detect stenoses in previously inaccessible arteries such as the mesenteric and renal trunks. The combination of B-mode and pulsed Doppler ultrasound is also suited to map and quantify occlusive lesions from the aorta down to the proximal calf arteries with an accuracy similar to arteriography. The clinical implication of these new techniques is discussed in this review article.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical programming 33 (1985), S. 28-42 
    ISSN: 1436-4646
    Keywords: Acyclic Subgraph Problem ; Feedback Arc Set Problem ; Facets of Polyhedra ; Polynomial Time Algorithms ; Weakly Acyclic Digraphs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The acyclic subgraph problem can be formulated as follows. Given a digraph with arc weights, find a set of arcs containing no directed cycle and having maximum total weight. We investigate this problem from a polyhedral point of view and determine several classes of facets for the associated acyclic subgraph polytope. We also show that the separation problem for the facet defining dicycle inequalities can be solved in polynomial time. This implies that the acyclic subgraph problem can be solved in polynomial time for weakly acyclic digraphs. This generalizes a result of Lucchesi for planar digraphs.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical programming 33 (1985), S. 43-60 
    ISSN: 1436-4646
    Keywords: Facets of Polyhedra ; Linear Ordering Problem ; Triangulation Problem ; Permutation Problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract LetD n be the complete digraph onn nodes, and letP LO n denote the convex hull of all incidence vectors of arc sets of linear orderings of the nodes ofD n (i.e. these are exactly the acyclic tournaments ofD n ). We show that various classes of inequalities define facets ofP LO n , e.g. the 3-dicycle inequalities, the simplek-fence inequalities and various Möbius ladder inequalities, and we discuss the use of these inequalities in cutting plane approaches to the triangulation problem of input-output matrices, i.e. the solution of permutation resp. linear ordering problems.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Title: Polyhedral combinatorics and the acyclic subdigraph problem; 7
    Author: Jünger, Michael
    Publisher: Berlin :Heldermann,
    Year of publication: 1985
    Pages: 128 S.
    Series Statement: R & E research and exposition in mathematics 7
    Type of Medium: Book
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2014-02-24
    Language: English
    Type: conferenceobject , doc-type:conferenceObject
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2014-02-24
    Language: English
    Type: article , doc-type:article
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Publication Date: 2014-02-24
    Language: English
    Type: article , doc-type:article
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Publication Date: 2014-02-24
    Language: English
    Type: article , doc-type:article
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Publication Date: 2014-02-24
    Language: English
    Type: conferenceobject , doc-type:conferenceObject
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Publication Date: 2014-02-24
    Language: English
    Type: article , doc-type:article
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...