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Laser drilling into an absorbing liquid (1992)

Mueller, R. E. ; Bird, J. ; Duley, W. W.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 71 (1992), S. 551-556

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The interaction of continuous CO2 laser radiation with water is described. Tightly focused radiation at powers of up to 120 W is used to generate and maintain a conical depression in the water surface similar to the keyhole created during laser penetration welding. The observed penetration depth of up to 7 mm is explained in terms of a hydrodynamic model and observations on the interaction induced liquid flows are described. The momentum reaction to the flow of steam up out of the keyhole generates a downward flow in the liquid around the keyhole with a velocity of ∼20 cm/s under the conditions of these experiments. The experiment has also been performed under variable gravity conditions provided by the NASA KC-135 Microgravity Aircraft to observe effects associated with changes in hydrostatic pressure and buoyancy on the system.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.350404

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Digitale Medien

Determination of H concentration in LiNbO3 by photorefractive fixing (1992)

Müller, R. ; Arizmendi, L. ; Carrascosa, M. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 60 (1992), S. 3212-3214

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A new method to determine the proton concentration in LiNbO3 is presented. The method is based on the measurement of the diffraction efficiency of a photorefractive grating in two situations. It is first measured after recording at room temperature, and second after saturation of the fixing process at a given temperature (about 150 °C). From only these two experimental data, the value obtained for the proton concentration in our sample is H0=(4.4±0.7)×1018 cm−3. This value agrees, within the experimental error, with that obtained from the infrared absorption arising from the OH− stretching bond.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.106742

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CO2 laser welding of polymers (1992)

Duley, W. W. ; Mueller, R. E.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 32 (1992), S. 582-585

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ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Deep penetration welding of polymers can be carried out at high speed with relatively low laser power. This results from an efficient coupling CO2 laser radiation to polymers that leads to volume heating. A brief review of energy coupling and heat transfer effects in polymers under CO2 laser welding conditions is given. Some examples of low power (10 to 100 watt) CO2 welding of polypropylene and polyethylene at depths of up to 1.5 cm are discussed.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pen.760320903

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Ein alternativer Weg zur Darstellung von Bi2Sr2CaCu2Ox, YBa2Cu3O7-δ, und YBa2Cu3-xMxO7-δ (M = Ni, Ag und x ≤ 33 Mol%)Professor Rudolf Hoppe zum 70. Geburtstage gewidmet (1992)

Schauerte, W. ; Schuster, H.-U. ; Knauf, N. ; [weitere]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 616 (1992), S. 186-190

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ISSN: 0044-2313

Schlagwort(e): Preparation of quaternary copper oxides ; high Tc superconductors ; characterization by X-ray powder methods ; AC- and DC-susceptibility ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: An Alternative Method for Preparation of Bi2Sr2CaCu3Ox, YBa2Cu3O7-δ, and YBa2Cu3-xMxO7-δ (M = Ni, Ag and x ≤ 33 Mol%)Oxidation of quenched melts of metals in a well defined argon/oxygen atmosphere has been found as an alternative method to prepare hight purity samples of Bi2Sr2CaCu2Ox without Pb-stabilization. A special equipment for the oxidation of powder samples will be described. By our new method it is also possible to prepare YBa2Cu3O7-δ and derivatives of this compound, where Cu is substituted by high amounts of Ni or Ag.

Notizen: Es wird eine alternative Präparationsmethode beschrieben, die es ermöglicht, durch Oxidation abgeschreckter Metallschmelzen in einer Sauerstoff-Argon-Strömungsapparatur sehr saubere, nicht Pb-stabilisierte Bi2Sr2CaCu2Ox-Präparate herzustellen. Dieser Weg ist auch für die Darstellung von YBa2Cu3O7-δ und Substitutionsderivaten dieser Verbindung mit hohen Konzentrationen an Ni oder Ag geeignet.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/zaac.19926161030

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