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  • Articles  (33)
  • Chemistry  (31)
  • Inorganic Chemistry  (5)
  • 42.60D  (1)
  • Atomic excitation and ionization by electron impact  (1)
  • 1990-1994  (21)
  • 1960-1964  (5)
  • 1950-1954  (2)
  • 1935-1939  (1)
  • 1930-1934  (2)
  • 1925-1929  (2)
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  • Articles  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Four-branch oscillation from a dual-polarization cavity CO2 laser (1993)
    Springer
    Applied physics 57 (1993), S. 227-230 
    Details
    ISSN: 1432-0649
    Keywords: 42.55E ; 42.60D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report here for the first time multiline oscillation of a cw-CO2 laser on all the four branches 10P, 10R, 9P, and 9R where all laser wavelengths share a common gain medium. The 9R, 9P and 10R branch lines lased at the expense of the high-gain 10P branch lines for which the cavity offered very high transmission losses. The 10P(20) line was made to lase by constructing another cavity with orthogonal polarization, thereby easing the strong competition between this line and the relatively low-gain 9R, 9P and 10R branch lines within the gain medium which is common to both cavities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334539
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  • 2
    Electronic Resource
    Electronic Resource
    Ionization of metastable H(2S) atom by electron and positron impact (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 571-583 
    Details
    ISSN: 0392-6737
    Keywords: Atomic excitation and ionization by electron impact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Triple differential cross-section (TDCS) of hydrogen atom in its metastable (2S) state is studied theoretically by electron and positron impact for coplanar and asymmetric geometry. The final-state wave function in the present model satisfies the asymptotic boundary condition for asymmetric geometry (i.e. fork 1≫k 2). In the absence of experiment, present results are compared with other existing theoretical results. Apart from the double-peaked structure of the TDCS as in ground-state ionization, some interesting secondary structures are found, in conformity with other theories for ionization from 2S state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451656
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  • 3
    Electronic Resource
    Electronic Resource
    Phenomenological model for the unified studies of different physical properties of polymers (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 207 (1993), S. 9-21 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird ein phänomenologisches Modell vorgestellt, mit dem sich das Entstehen starker Anisotropien der physikalischen Eigenschaften semikristalliner Polymerer nach einachsigem Verstrecken beschreiben 1äßt. Dieses Modell führt die Temperatur als expliziten Parameter in die Orientierungsfunktion ein. Es enthält zwei frei wählbare Parameter, die für jedes Polymere durch Anpassen der experimentellen Daten der Doppelbrechung als Funktion des Verstreckverhältnisses bei einer bestimmten Temperatur ermittelt werden konnen. Die berechneten Werte für Elastizitätsmodul, thermische Leitfähigkeit und Expansibilität parallel und senkrecht zur Streckrichtung stimmen in einem wäiten Bereich des Verstreckverhältnisses und der Temperatur mit den experimentellen Ergebnissen gut überein.
    Notes: A phenomenological model has been proposed to understand the development of strong anisotropy in physical properties of semicrystalline polymers on uniaxial drawing. The proposed model introduces temperature as an explicit parameter in the orientation function. The model contains two free parameters for each polymer which can be evaluated by fitting the experimental data on birefringence versus draw ratio at a particular temperature. The calculated values of elastic moduli, thermal conductivity and expansibility along and perpendicular to the drawing direction over the entire range of draw ratio and a wide range of temperature are in good agreement with experimental values.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052070102
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  • 4
    Electronic Resource
    Electronic Resource
    A study on the thermal degradation of rubber in dilute solutionsCommunication No. 529 from the National Chemical Laboratory, Poona-8, India. (1963)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 2199-2209 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The kinetics of low-temperature (60-100°C.) thermal degradation of deproteinized and deresinified petroleum ether soluble fraction of natural rubber in two chemically inert solvents, cyclohexane and trans-decalin, have been studied. The changes in Mw, A2, and (r2)1/2 at various stages of degradation have been obtained from the lightscattering data. The rate constants and the energy of activation for chain scission have been calculated from the observed variation in Mu. The scission has been found to be random and the average energy of activation is 25.8 kcal./mole. This low-energy requirement suggests the presence of weak links in the rubber molecule which get ruptured at low temperature.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1963.070070619
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  • 5
    Electronic Resource
    Electronic Resource
    Chemiluminescenz bei der Oxydation von Farbstoffen durch Ozon (1928)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 173 (1928), S. 125-136 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Wenn ozonisierter Sauerstoff durch Lösungen von Eosin, Uranin, Safranin, Neutralrot, Rhodamin B, Thioflavin, Cartharamin Rhodamin B. J. N. N., Erythrosin und Aesculin geleitet wird, beobachtet man ein Leuchten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19281730114
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  • 6
    Electronic Resource
    Electronic Resource
    Chemiluminescenz bei der Oxydation von fluorescierenden und nicht fluorescierenden Stoffen durch Wasserstoffperoxyd und Ozon (1929)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 186 (1929), S. 154-158 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Wenn zahlreiche fluorescierende oder nicht fluorescierende Farbstofflösungen durch Wasserstoffperoxyd in Gegenwart von Ferrosulfat oxydiert werden, tritt ein Glimmen auf, das im dunklen Raume zu erkennen ist.2. Die Wellenlangen der Glimmerscheinung bei der Oxydation einiger fluorescierender Fnrbstoffe durch ozonisierten Sauerstoff sind gemessen worden.3. Kieselsaure mit etwas adsorbiertem Neutralrot zeigt in einer Suspension in Äthylallrohol bei Behandlung mit ozonisiertem Sauerstoff eine Glimmerscheinung.4. Wenn kleine Mengen eines Farbstoffes, der gutes Glimmen zeigt , rnit einem anderen Farbstoff von schwachem Glimmvermogen gemischt werden, so liefert das Gemisch bei Behandlung mit Ozon ein starkeres Glimmen als der schwächer glimmende Farbstoff allein.5. Steigerung der Temperatur führt zur Verstarkung des Glimmens bei der Oxydation von Reduktionsmitteln durch Ozon oder Wasserstoffperoxyd.6. Zunahme der Konzentration der Reduktionsmittel verursacht eine Steigerung der Glimmintensitat bis zu einem Grenewert. Wird die Konzentration weiter gesteigert, so schwacht sich das Glimmen ab und hört schließlich auf.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19291860111
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  • 7
    Electronic Resource
    Electronic Resource
    Chemilumineszenz bei der Oxydation von Farbstoffen und phenolartigen Stoffen durch Wasserstoff-per-oxyd und Ferrosulfat oder durch Ozon (1931)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 199 (1931), S. 400-405 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemilumineszenz wurde beobachtet, als die folgenden Farbstoffe durch Ozon oder Wasserstoffperoxyd und Ferrosulfat oxydiert wurden: Safranin, Acridinorange, Thioflavin, Alizarinblau, Auramin G, Capriblau, Methylenblau BB, Methylenblau R, Rhodamin 6 G, Rhodamin B, Viktoriablau A, Methylorange, Malachitgrün, Thionin, Äthylgrün, Indigocarmin, Hämatoxylin, Curcumin S, Cartharamin D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19311990142
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and evaluation of a polyimide containing carbazole and naphthalene moiety (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 3795-3800 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080281322
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  • 9
    Electronic Resource
    Electronic Resource
    Production, purification, and characterization of xylanase from a hyperxylanolytic mutant of Aspergillus ochraceus (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 35 (1990), S. 244-251 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Enhancement of the productivity of xylanase and β-xy-losidase of Aspergillus ochraceus was investigated by multistep mutagenesis. The spores of the wild strain were subjected to UV and N-methyl-N-nitro-N-nitro-soguanidine (NTG). The hyperxylanolytic mutant (NG-13), which showed good clearing on the surface of the xylan-agar plate, secretes xylanase and β-xylosidase at high levels during growth on commercial xylan and on agricultural wastes. Both liquid and solid state cultures were employed in the study for enzyme production. The xylanase from NG-13 was purified to homogeneity by ammonium sulfate precipitation and gel filtration. This purified enzyme showed a pH optimum of 6.0 and was stable in the range of pH 5 to 10. Prolonged stability of the enzyme was observed at 45°C though its activity was maximal at 50°C. The molecular weight of the enzyme was estimated to be 4.3 × 104 by SDS-polyacrylamide gel electrophoresis and 5 × 104 by gel filtration on Sephadex G-75. The kinetic data showed that the Km and Vmax values for xylan were 1 × 10-3M and 19.6 μmol/ min/mg protein, respectively. The enzyme was both more active and thermostable in the presence of K+and was inactivated by thiol reagents such as Hg2+, p-hydroxymercuribenzoate (PHMB), 3′, 5′-dithiobis (2′-nitrobenzoic acid) (DTNB), and N-ethylmaleimide (NEM).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260350305
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  • 10
    Electronic Resource
    Electronic Resource
    Coulometric Determination of Arsenic(III) and antimony(III) (1963)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 21 (1963), S. 147-148 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The coulometric determination of tripositive arsenic and antimony by electrogenerated iodine in a NaHCO3 buffered solution of pH 8 has been described. The end point can be determined visually using starch as an indicator. Quantities of As(III) and Sb(III) down to the microgram level can be determined within permissible limits of error.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19630210304
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