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
    Virchows Archiv 364 (1974), S. 365-369 
    ISSN: 1432-2307
    Keywords: Virus Diseases ; Cytomegalic Inclusion Disease ; Kidney ; Kidney Diseases ; Glomerulonephritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This paper reviews a case of a newborn child which died soon after birth in consequence of a cytomegalic inclusion disease involving the brain, liver, lungs and kidneys. The interest of the case lies in the unusual finding of lesions of the vascular loops of the renal glomeruli. These lesions were represented by focal areas of homogeneous appearance which were strongly basophilic and PAS-positive. Although the nature of these areas has not been completely established, the renal lesions can be tentatively defined as focal, probably necrotizing glomerulonephritis. The association of this type of glomerular lesions with cytomegalic inclusion disease has not been previously reported.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Atomic energy 11 (1962), S. 776-788 
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract This article discusses the feasibility of industrial applications of electrostatic generators. A detailed description of the operating principles and technical functioning of cylindrical generators developed at Grenoble University is presented. It is shown that these cylindrical generators are the first electrostatic machines suitable for industrial use on a broad scale. The parameters of several generators now being manufactured by industry on a regular basis are given.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Abstract The insulating capabilities of pure propylene carbonate (PC) have been studied, taking into account the oxidation and reduction of this solvent and its impurities. At high water concentrations (〉 10−2 mol−1), the accessible potential range of PC, 10−1 moll−1 Et4NClO4 solutions, is limited by the reduction and oxidation of water. Its reduction forms hydrogen and OH− ions which quickly hydrolyse PC and gives propanediol 1–2 and bicarbonate ions. At low water concentrations (〈 5 × 10−3 moll−1), it is shown that electrochemical reduction of PC takes place, giving propylene and bicarbonate ions. On the other hand, some facts hint at an oxidation of PC at the anode. The influence of the electrode material (stainless steel, aluminium, platinum) on the potential range has also been investigated. These electrochemical processes are the controlling factors of the high voltage conduction of carefully deionized PC (resistivity in the 1011–1012 Ω cm range). It is shown that electron transfer at liquid/metal interfaces occurs mainly through electrochemical reactions on plane parallel electrodes as well as on very small diameter wire (20–200μm). The insulating behaviour of deionized PC is fairly satisfactory; with aluminium electrodes the current density increases slowly with voltage and reaches no more than 10−6 A cm−2 at high electric fields (105V cm−1). Thus, rather unexpectedly, a very high dielectric constant (70) does not necessarily imply an excessive conductivity at high voltage. Other work cited in reference has shown that the conductive behaviour of a (deionized) liquid under high voltage depends very critically on the properties of the degradation products formed at the electrodes. The case of PC is very favourable, in spite of its very high dielectric constant, since these products (propane-diol and carbonic acid) are very poor electrolytes. On the other hand deionized acetonitrile soon loses its initial resistivity because of proton-catalyzed hydrolysis giving acetate ions. Another example is the liquid crystal MBBA.
    Notes: Résumé On étudie le comportement du carbonate de propylène pur en haute tension après avoir recherché par voie électrochimique les réactions d'oxydation ou de réduction de ce solvant ou de ses impuretés. Aux teneurs en eau élevées (10−2M), le domaine d'électroactivité en réduction du CP en présence de perchlorate de tétraéthylammonium est limité par la réduction de l'eau. Il y a libération d'hydrogène et les ions OH− formés provoquent l'hydrolyse rapide du CP donnant du propanediol 1–2 et des ions bicarbonates. Aux faibles teneurs en eau (〈 5 × 10−3M), la réduction électrochimique du solvant donnant du propylène et des ions bicarbonates est mise en évidence. L'influence de la nature du métal (acier inoxydable, aluminium) sur le domaine d'électroactivité est également examinée. Ces phénomènes électrochimiques sont les facteurs déterminant la conduction en haute tension du CP soigneusement désionisé (gamme de résistivité de 1011 à 1012 Ω cm). On montre que sur des électrodes planes, parallèles comme sur un fil de très petit diamètre (20 à 200μm) le transfert électrique métal-solution se fait par réactions électrochimiques. Le CP se comporte à l'état pur comme un liquide diélectrique relativement inerte. Sur des électrodes en aluminium, la densité de courant ne croît que lentement avec la tension et n'atteint 10−6 A cm−2 qu'à des valeurs élevées du champ électrique (∼ 105 V cm−1). Ainsi contrairement à ce qui est généralement admis, une valeur élevée de constante diélectrique d'un solvant n'est pas forcément associée à une conduction élevée en haute tension. En se référant à nos autres travaux, nous montrons que le comportement en haute tension d'un liquide désionisé dépend de manière critique des propriétés des produits de dégradation formés aux électrodes. Le cas du CP est très favorable en dépit de sa grande constante diélectrique, puisque les produits des réactions électrochimiques (propane diol, acide carbonique) sont des electrolytes très faibles. Au contraire, l'acétonitrile désionisé perd vite sa résistivité initiale en raison de son hydrolyse acide donnant des ions acétates. Un autre exemple est le cristal liquide MBBA.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...