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  • Radioactivity  (10)
  • 25.70.Np  (4)
  • Polymer and Materials Science  (4)
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  • 11
    Digitale Medien
    Digitale Medien
    β-Delayed neutron emission of15B,18C,19,20N,34,35Al and39P (1988)
    Springer
    The European physical journal 330 (1988), S. 63-68 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Np ; 23.40.-s ; 27.30.+ t
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The isotopes15B,18C,19,20N,34,35Al and39P have been produced as projectile-like fragments from the interaction of a86Kr beam of 45 MeV/u from GANIL with a181Ta target. Separated by the 0° magnetic analyser LISE, the nuclei are identified by means of aΔE- E semiconductor telescope. It is surrounded, in a geometry close to 4π, by a thin plastic scintillator (NE 102) and a large volume liquid scintillator (NE 213) for the detection of betas and neutrons, respectively, from the decay of the implanted nuclei. By observation of theβ-delayed neutrons, the half-livesT 1/2 and neutron emission probabilitiesP n have been measured. TheT 1/2 of18C,20N,35Al,39P and Pn of18C,19,20N,34,35Al and39P are determined for the first time. For the isotopes17C,36,37Si and38P upper limits of Pn are deduced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01287265
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
    Digitale Medien
    Digitale Medien
    Total cross sections of reactions induced by neutron-rich light nuclei (1989)
    Springer
    The European physical journal 332 (1989), S. 457-465 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.-k ; 07.75.+h ; 21.10.Gv ; 25.70.Np ; 27.20.+n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Total nuclear reaction cross-sections are determined by means of a 4π-γ method. The results cover a wide span of targets for various stable beams. The validity of the method is shown in a combined systematics including also the results of transmission-type experiments. The data are very well described by the formula developed by Kox et al. The same method is applied to secondary fragment beams produced from a 44 MeV/u22Ne beam on a 332mg/cm2 181Ta target. Using the LISE spectrometer the fragments4, 6He,6–9, 11Li,7, 9–12, 14Be,10–15, 17B11–19C,13–19N,15–21O,18– 21F and20,21 Ne are analyzed and transported to interact with a 199.4 mg/cm2 Cu target surrounded by a 4π-γ counter. The measured total reaction cross-sectionsσ R are discussed in terms of the reduced strong absorption radiusr 0 and compared with other experimental results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01292431
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  • 13
    Digitale Medien
    Digitale Medien
    Direct observation of new proton rich nuclei in the region 23≦Z≦29 using A 55A.MeV58Ni beam (1987)
    Springer
    The European physical journal 327 (1987), S. 17-24 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10-k ; 25.70.Np ; 27.40+z
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Using magnetic separation and identification through time of flight andΔExE measurements, the nuclei56Cu,52Co (T z =−1);55Cu,51Co,47Mn,43V(T z =−3/2)52Ni,50Co,48Fe,46Mn,44Cr (T z =−2); and51Ni (T z =−5/2) are observed for the first time from interactions of 55A.MeV58Ni projectiles with a Ni target. The predicted proton drip-line has probably been reached for the odd elements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01295244
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  • 14
    Digitale Medien
    Digitale Medien
    New neutron-rich isotopes in the scandium-to-nickel region, produced by fragmentation of a 500 MeV/u86Kr beam (1992)
    Springer
    The European physical journal 343 (1992), S. 67-71 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.Np ; 27.50. + e
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have measured production cross-sections of the new neutron-rich isotopes58Ti,61V,63Cr,66Mn,69Fe,71Co and neighbouring isotopes that have been identified as projectile fragments from reactions between a 500 MeV/u86Kr beam and a beryllium target. The isotope identification was performed with the zero-degree magnetic spectrometer FRS at GSI, using in addition time-of-flight and energy-loss measurements. The experimental production cross-sections for the new nuclides and neighbouring isotopes are compared with an empirical parametrization. The resulting prospects for reaching even more neutron-rich isotopes, such as the doubly-magic nuclide78Ni, are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291599
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  • 15
    Digitale Medien
    Digitale Medien
    Zur Korrosion verzinkter Eisenwerkstoffe durch natürliche Brauchwässer (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 282-286 
    Details
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Corrosion of galvanized ferrous materials by natural watersLaboratory and field test with galvanized irons do not reveal clear interrelations between water quality and corrosion. Likewise it is not possible on the basis of potential measurements to make any statement with respect to the formation of protective layers. It is for this reason that some doubt may be expressed as to the applicability of the test method according to DIN 50 930, the more so as the formation of ZnCO3 could be shown to take place in some few cases only.
    Notizen: Laboratoriums- und Feldversuche mit verzinktem Eisen zeigen keine eindeutigen Zusammenhänge zwischen Wasserbeschaffenheit und Korrosion. Ebenso ist es nicht möglich, aufgrund von Potentialmessungen Aussagen über die Schutzschichtbildung zu machen. Aus diesem Grunde kann auch die Anwendbarkeit der Untersuchungsmethode nach DIN 50 930 in Zweifel gezogen werden, zumal nur in Einzelfällen die Bildung von ZrCO3 eindeutig nachgewiesen werden konnte.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/maco.19730240405
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  • 16
    Digitale Medien
    Digitale Medien
    A conductometric detector for capillary separations (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 722-725 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Conductometry ; Detection ; Capillary electrophoresis ; Capillary HPLC ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A simple electrochemical cell has been constructed for conductometric detection in capillary electrophoresis or HPLC. A platinum ring electrode is chemically deposited at the capillary end and the other electrode, a platinum wire, is immersed, together with the capillary, in a vessel containing the running buffer or the mobile phase used. The cell has been tested on a model system and its operational parameters have been discussed. The measurement is very sensitive (a limit of determination of ca. 3 × 10-9 M for potassium ions) and the detector response is rapid, comparable with that of the UV photometric detector. The dynamic range is wide (at least five concentration decades) but is nonlinear at high concentrations.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140080804
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  • 17
    Digitale Medien
    Digitale Medien
    Zur Bildung von gewinkelten Leiterpolymeren in Polyacrylnitril-FasernHerrn Professor Dr. FRANZ PATAT zum 65. Geburtstag gewidmet (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 144 (1971), S. 117-133 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: The process of cyclization of copolymer-free polyacrylonitrile (PAN) at thermal treatment between 200 and 300°C in air is studied by measuring the elongation-shrinkage behaviour of polymer fibres under tensile stress. It was found that solely the shrinkage which occurs above 235°C is caused chemically, whilst the fibres are stretched by plastic deformation up to 235°C. The shrinkage above 235°C is explained as a consequence of cyclization reactions of PAN leading to polymers with angled partial ladder structure. The maximum shrinkage of about 25%, obtained experimentally without tensile stress, is in agreement with conclusions drawn on molecular models. These models are based on differing ratios of inter- and intramolecular addition reactions between the nitrile groups of PAN. The remaining elongation attainable after thermal treatment up to 300°C is determined by the reaction conditions until cyclization sets in, and was increased up to 40% using endless copolymer-free PAN fibres.
    Notizen: Der Verlauf der Cyclisierung von copolymerfreiem Polyacrylnitril (PAN) bei thermischer Behandlung zwischen 200 und 300°C an Luft wird durch Messung des Dehnungs-Schrumpfungs-Verhaltens von Polymerfäden unter Zugbeanspruchung studiert. Es wurde gefunden, daß nur die oberhalb 235°C eintretende Schrumpfung chemisch bedingt ist, während die Fasern bis 235°C durch plastische Verformung gedehnt werden. Die Schrumpfung oberhalb 235°C wird als eine Folge der Cyclisierungsreaktionen des PAN zu Polymeren mit gewinkelter partieller Leiterstruktur erklärt. Die experimentell ohne Zugbeanspruchung gefundene maximale Schrumpfung von ca. 25% steht in übereinstimmung mit überlegungen an Molekülmodellen, bei denen unterschiedliche Verhältnisse von inter- und intramolekularen Additionsreaktionen zwischen den Nitrilgruppen zugrunde gelegt werden. Die erreichbare bleibende Dehnung nach der thermischen Behandlung bis oberhalb 300°C wird von den Reaktionsbedingungen bis zur einsetzenden Cyclisierung bestimmt und konnte an endlosen copolymerfreien PAN-Fäden bis zu 40% gesteigert werden.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1971.021440110
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  • 18
    Digitale Medien
    Digitale Medien
    Rapid Methods for Quality Control of Gun Propellants (1982)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 7 (1982), S. 53-57 
    Details
    ISSN: 0721-3115
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Several single-base, double-base, and triple-base gun propellants were analyzed by three different methods: Conventional analytical methods (TL 1376-600)High-pressure liquid chromatography (HPLC)Derivative spectroscopy.The results obtained by these methods agree well and show a good reproducibility. However, compared with each other, the chromatographic methods are not only more rapid and more flexible than the conventional wet chemical analysis, they enable a quantitative determination of blasting oil mixtures like nitroglycerin or diglycoldinitrate. The same holds for many other explosives, stabilizers and stabilizer reaction products.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prep.19820070206
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