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  • Industrial Chemistry and Chemical Engineering  (3)
  • Embolization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Nierentumorembolisation (1999)
    Springer
    Der Radiologe 39 (1999), S. 783-789 
    Details
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Nierentumor ; Embolisation ; Pallitive Therapie ; Ethibloc® ; Alkohol ; Kapilläre Okklusion ; Key words Renal carcinoma ; Embolotherapy ; Embolization ; Capillary occlusion ; Ethanol ablation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Today the relevance of renal tumor embolization is not determined only by the technical and clinical success of the method. Progress in diagnosis of early stages of renal carcinomas as well as the improvement of both surgical techniques and anesthetic procedures have lead to a change in the selection of patients for embolization. Preoperative embolization of advanced renal cell carcinomas with tumor thrombus into the vena cava or of T4 tumors is now an established clinical procedure. The complete occlusion of the vascular bed of the tumors leads to a considerable reduction in intraoperative blood loss and to simplification of the surgical preparation. By using Ethibloc for embolization, palliation of a hemorrhage or of tumor-related pain in inoperable patients is usually successful. Although local control of the tumor disease, including complete tumor ablation, is achieved by embolization, the median survival rate of our palliatively embolized patients is only 3.5 months. This short life expectancy in the group of inoperable patients has to be acknowledged individually in patients considered for palliative embolization who are free of symptoms related to the tumor.
    Notes: Zusammenfassung Hintergrund: Der Stellenwert der Nierentumorembolisation wird heute nicht allein vom technischen und klinischen Erfolg der Methode bestimmt. Die Fortschritte sowohl in der Früherkennung von Nierenkarzinomen als auch die Verbesserung der Operationstechniken und der Narkoseverfahren haben zu einer Veränderung in der Patientenselektion zur Embolisation geführt. Präoperative Embolisation: Die präoperative Embolisation von fortgeschrittenen Nierenzellkarzinomen mit Tumorzapfen in der V. cava oder von T4-Tumoren ist ein im klinischen Alltag fest etabliertes Verfahren. Der vollständige Verschluß des Gefäßbetts der Tumoren führt zu einer erheblichen Reduktion des intraoperativen Blutverlusts und einer Vereinfachung der Präparation. Embolisation bei inoperablen Patienten: Bei inoperablen Patienten gelingt durch die Embolisation mit Ethibloc® zuverlässig die Palliation einer Hämaturie oder von Tumorschmerzen. Obwohl durch die Embolisation eine lokale Kontrolle des Tumorleidens bis hin zur kompletten Ablation der tumortragenden Niere möglich ist, liegt derzeit das mediane Überleben unserer pallitiv embolisierten Patienten bei nur 3,5 Monaten. Diese in der allgemeinen klinischen Inoperabilität begründete kurze verbleibende Lebenserwartung muß für jeden bezüglich des Tumors symptomfreien Patienten individuell bei der Indikationsstellung zur palliativen Embolisation berücksichtigt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001170050576
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An efficient method for the calculation of chemical equilibrium composition in multicomponent gas mixtures (1995)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 18 (1995), S. 292-294 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The determination of the composition of multi-component mixtures is the basis by which a number of technical and physical problems in the field of power and process engineering are modelled. In order to calculate chemical states of equilibrium in the gas phase, a calculation method will be presented which is founded on a minimization of the Gibbs enthalpy. This method is characterized by a high reliability in convergency, considerable independence of starting vectors and by a moderate requirement for programming. These characteristics are achieved by a transformation of variables which results in numerically more favourable solutions to the non-linear equation system. Calculated equilibrium compositions (including dissociation and ionisation) for a stochiometric mixture of hydrogen and oxygen in a temperature range of 300-12000 K and a pressure of 105 Pa as well as the application of the method will be demonstrated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270180411
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  • 3
    Electronic Resource
    Electronic Resource
    Mass- and momentum transfer in hydrogen/air and methane/air mixtures (1995)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 18 (1995), S. 386-396 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In this article we present results for the viscosity and the mass transfer rates of hydrogen/air, hydrogen/oxygen, methane/air and methane/oxygen mixtures in the temperature range from 1000 to 7000 K and a pressure range from 103 to 106 Pa. In addition, the combustion ratio is varied from 0 to ∞. The transport properties are calculated from the first order solution of the Chapman Enskog approach to the Boltzmann equation, assuming chemical equilibrium composition. An extensive literature study was performed to derive experimental and/or theoretically based data for the respective binary interaction potentials. The values of the collision integrals, as derived from a complex numerical integration procedure, are correlated to an approximation formula. In addition, the exact solutions of the kinetic theory are compared to frequently used empirical mixture rules. For the mixture viscosity an easy approximation formula is deduced from the gas-kinetic theory.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270180604
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  • 4
    Electronic Resource
    Electronic Resource
    Energy transfer in hydrogen/air and methane/air mixtures (1996)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 19 (1996), S. 324-336 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This article presents gas kinetic calculation methods for the energy transport in hydrogen/ air and methane/ air mixture. The total molecular heat conductivity as well as its various shares are calculated and discussed for a temperature range of 400 to 3500 K and for a pressure of 105 Pa. The variation of the air/ fuel ratio under the conditions of chemical equilibrium is also investigated. As opposed to our previous article, an extension of the Chapman-Knskog method which goes beyond the classical 1st approximation for elastic collisions is applied for the evaluation of suitable calculation methods. This is carried out following the method for strong relaxing thermal nonequilibrium according to Brun. The equations applied in this work are simplified formulations for the proximity to equilibrium. The method for the evaluation of the parameters of the inelastic collision and some chosen results are presented. A discussion of the various shares of the molecular heat conductivity emphasizes the considerable influence of the diffusion and the thermal diffusion processes in fuel/ air mixtures compared to the Fourier heat conductivity.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270190406
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