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  • Electronic Resource  (7)
  • 1995-1999  (3)
  • 1975-1979  (1)
  • 1970-1974  (2)
  • 1960-1964  (1)
Material
  • Electronic Resource  (7)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 26 (1996), S. 1217-1223 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Aluminium alloys were tested in Al/O2 cells with strongly acidic electrolytes containing minor amounts of chloride ions. The faradaic efficiency, the maximum discharge capacity and the peak power of various Al/O2 cells were evaluated. The temperature dependence of the faradaic efficiency was measured for an Al/O2 cell over the temperature range from 15 to 50°C. With a zinc-containing aluminium alloy, a faradaic efficiency of 84% and a cell voltage of 1.6 V at open circuit and 0.7 V at 100 mA cm−2 could be reached. The highest peak power 120 mW cm−2, was obtained with an Al-Zn/Sn alloy. On the basis of the solubility of the anode products in the electrolyte, a limiting specific energy of 70 Wh kg−1 was estimated. The cell voltage depends on the Al-alloys and on the catalyst used in the oxygen electrode. The cell voltage could be increased by about 200 mV when replacing the Pt-catalysed oxygen electrode with a noble-metal-free (CoCAA/DCD) electrode.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 28 (1998), S. 895-898 
    ISSN: 1572-8838
    Keywords: zinc–air battery ; pasted zinc electrode ; cellulose ; cycle life
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract For the development of a long-lived, electrically rechargeable zinc–air battery the structure and wettability of pasted zinc electrodes were optimized. Pasted zinc electrodes containing 1 to 10% cellulose but having almost the same nominal capacities were prepared and tested in zinc/oxygen cells. The effect of discharge rate on cell voltage and delivered capacity, as well as the maximum power, were measured. Furthermore, cell charge–discharge behaviour and cycle life were examined. After different times of operation, the porosity and the pore size distribution of the pasted zinc electrodes were measured by means of mercury porosimetry. The cycle life and peak power drain capability of the Zn/oxygen battery could be substantially improved by the addition of 10wt% cellulose to the pasted zinc electrode.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 25 (1995), S. 114-121 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A filter-press-type Al/O2 battery with bipolar assembly of the electrodes was developed. The current-voltage curves and power output of monopolar and of bipolar batteries containing one to four cells were measured in alkaline (4 m NaOH and 7.5 M KOH) and acidic (3 m H2SO4 + 0.041 m HCl) electrolytes. The unit cell had an open circuit voltage of 1.85 V in alkaline media and 1.3 V in acidic media. The single bipolar unit delivered a maximum power of about 7.5 W (75 mW cm−2) at 0.7 V. The stack (four cells) had a maximum power of 30 W in 4 m NaOH and 35 W in 3 m H2S04 + 0.04 m HCl. The power output of the bipolar stack determined experimentally for different external loads could be described using the model of an electric equivalent circuit.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 55 (1964), S. 205-212 
    ISSN: 1437-1596
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 62 (1974), S. 711-716 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Fehleranalyse wurde für Natrium in dem Konzentrationsbereich 40–400 mVal/l, für Kalium im Bereich 0,5–40 mVal/l durchgeführt. Das Probenvolumen betrug ca. 1 nl. Für jede Meßkurve wurden 5 Meßpunkte mit je 8 Wiederholungen bestimmt. Jede Wiederholung bestand aus 3 Teilmessungen, um die Interferenzeffekte zwischen Na und K zu erfassen. Schätzung der Parameter der Ausgleichsgeraden nach der Methode der kleinsten Quadrate mit Wichtung. Test auf Linearität. Mit Hilfe des Fehlerfortpflanzungsgesetzes Rückrechnung auf Fehlerbehaftung in der Konzentration. Es ergab sich der relative Fehler für Natrium 24,8 % 〉=¦σc/c¦ ≧3,9 % und Kalium zu 25,0 % ≧¦σc/c¦ ≧5,9 % bei optimaler Einstellung des Gerätes für die jeweiligen Konzentrationsbereiche.
    Notes: Summary The analysis of error was carried out for sodium in concentrations from 40 to 400 meq/l, and for potassium in the range from 0.5 to 40 meq/1. The sample volume was about 1 nl. For each calibration curve five calibration points were measured eight times each. Each repetition was carried out by three partial measurements in order to find the interference effects between sodium and potassium. The parameters of the best straight line calculated by the method of weighted least-squares were estimated. Linearity was tested. By the low of propagation of error, the error in the calculated concentrations was estimated. At optimal settings of the instrument the relative error ranged from 25 to 4% for sodium and from 25 to 6% for potassium.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 51 (1979), S. 91-96 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The diagnostic and therapeutic aspects of 10 cases of diastematomyelia are reported. The cutaneous, orthopaedic, neurological, and radiological signs and symptoms are discussed and emphasized. Different embryological and physiopathological aspects are commented on. Surgical treatment is recommended in all cases.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 343 (1973), S. 179-183 
    ISSN: 1432-2013
    Keywords: Inulin Measurement ; Ultra-Micro Method ; Sphere Attachment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A simple method using glass capillaries instead of microcuvettes for measurement of inulin in nanoliter samples is given. Inulin was determined with anthron reagent (5 or 10 nl samples +3 μl anthron reagent). Glass capillary tubes (o.d.=1 mm, i.d.=0.68 mm, length=150 mm) in which the chemical reaction took place during incubation at 56°C were directly introduced into the optical system of a Zeiss spectrophotometer PMQ II with sphere attachment and objective. Extinction was measured vertically to the axis of the capillary. The changes of extinction of 20 different capillaries with the blank at different positions was only 1.13×10−3. The exactness of measurement in the concentration range of 100 ≤ 200 ≥ 400 ≥ 750 ≥ 1500 ≥ 3000 mg-% inulin was for 5nl/3 μl: 19.8 ≥ 11.0 ≥ 6.7 ≥ 4.7 ≥ 3.0 2.2%. 10nl/3 μl: 13.0 ≥ 8.4 ≥ 5.1 ≥ 3.9%. This method of measurement may also be applicable for other colorimetric reactions with nanoliter samples.
    Type of Medium: Electronic Resource
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