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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2466-2474 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new type of low-energy ion accelerator has been developed. It includes an eight-storied Disktron generator, newly developed accelerating tubes which hold up to 4 MV/m, both single and tandem acceleration capability, and a compound negative ion source. The Disktron generates 3.2 MV with a dummy load and 2.2 MV with ion beams, and has a voltage stability better than 10−3 at around 1 MV with a corona feedback stabilizer or a generating voltmeter feedback stabilizer only. The highly stabilized voltage of the Disktron has particularly been allowed to form an ion microbeam of about 1-μm diameter.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of volcanology 55 (1993), S. 438-442 
    ISSN: 1432-0819
    Keywords: dome ; submarine ; dacite ; micro-structure ; groundmass ; Miocene ; Japan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Microscopic shear zones have been found in the groundmass of glassy rocks of a Miocene submarine dacite dome in southwest Japan. Similar textures have been reported previously but only in dykes. These textures give a valuable insight into the deformation of the dome during its emplacement by recording the orientations of the principal strains. Detailed textural analysis indicates that the microshear zones formed as a result of flattening and stretching of the magma simultaneously with quenching. Measured stretching directions are near-parallel suggesting the magma flowed in one dominant direction rather than in a radial pattern. The strain is believed to also be influenced by high magma pressure inside the dome being imposed on the high viscosity outer part of the dome.
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  • 3
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es wurde die Konformation vom linearen Poly(p-chlorostyrol) (PPCS) im endothermen Lösungsmittel (n-Propylbenzol) und im exothermen Lösungsmittel (tert-Butylacetat) bei den θ-Temperaturen untersucht. Die Bestimmung des molekularen Parameters, der Vergleich zwischen den Winkelabhängigkeiten der experimentellen und theoretischen Streukurven und die Diskussion über das asymptotische Verhalten der Streukurven wurden für die beiden Systeme durch Analyse der Röntgenkleinwinkelstreuungsdaten durchgeführt. Die Werte von Persistenzlängen und Querschnittsstreumassenradien waren 10.5–13.0 Å und 3.7 Å für PPCS-n-Propylbenzol, bzw. 11.1–13.7 Å und 5.2 Å für PPCS-tert Butylacetat. Es scheint, daß kein Einfluß auf die Persistenzlängen in den beiden Systemen existiert, während ein solcher auf die Querschnittsstreumassenradien der Polymerknäuel festzustellen ist, je nachdem das System endotherm oder exotherm ist. Die Verteilung der Elektronendichte hat die gleiche Wirkung auf den Querschnitt in den beiden Systemen. Nach dem asymptotischen Verhalten der Streukurven hat das System von PPCS-n-Propylbenzol die größere innere Oberfläche als die von PPCS-tert Butylacetat. Die Übereinstimmung zwischen den experimentellen und theoretischen Streukurven wird innerhalb der experimentellen Winkelbereiche festgestellt. Hieraus wird geschlossen, daß die Konformationen des PPCS unter Thetabedingungen dieselben sind, die Knäuel ideale Knäuel sind und nur die Werte von Querschnittsstreumassenradien der Polymerknäuel in den beiden Lösungsmitteln differieren.
    Notes: Summary Conformations of linear poly(p-chlorostyrene) (PPCS) in an endothermic solvent (n-propylbenzene) and an exothermic solvent (tert-butyl acetate) at theta temperatures have been investigated by X-ray small angle scattering. By analyzing X-ray small-angle scattering data for the two systems, the determination of molecular parameters and the comparison between an angular dependence of experimental scattering curve and that of theoretical one have been made, with the discussion on the asymptotic behavior of the scattering curve. The values of persistence length and the radius of gyration of a cross section of polymer chain were 10.5–13.0 Å and 3.7 Å for PPCS-n-propylbenzen, and 11.1–13.7 Å and 5.2 Å for PPCS-tert-butyl acetate, respectively. The values of persistence length seem to be little affected in both systems, while those of radius of gyration of a cross section of polymer chain seem to be affected appreciably by the condition whether the system is endothermic or exothermic. The effect of the distribution of the electron density on the cross section is almost equal in both solvents. From the asymptotic behavior of scattering curves, the system of PPCS-n-propylbenzene has the area of interface larger than that of PPCS-tert-butyl acetate. Agreements between theoretical and experimental scattering curves are found over the experimental angular regions. Thus, it is considered that conformations of PPCS in both theta conditions are the same as that of an ideal chain and only a radius of gyration of the cross section of the polymer chain assumes different values in two solvents.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 46 (1977), S. 223-233 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Es wird das Ausströmen eines runden Strahls einer reibungslosen Flüssigkeit aus einer Düse mit langsam veränderlichem Profil unter dem Einfluß der Schwere untersucht. Mit Hilfe einer gemischten asymptotischen Entwicklung wird der Einfluß der Singularität am Düsenausgang erfaßt. Es werden einige numerische Beispiele mitgeteilt, aus denen Einzelheiten der Strömung am Ausgang der Düse zu ersehen sind.
    Notes: Summary An analysis is made of a round jet of inviscid liquid which ejects from a nozzle of slowly varying profile, under the influence of gravity. The matched asymptotic expansion technique is applied to deal with the singularity at the nozzle exit and numerical examples are presented for the details of the flow near the nozzle exit, using the composite expansion.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 26 (1991), S. 3775-3779 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cold-drawn copper wires were made by cold-drawing after hot-rolling tough pitch copper rods which had been pre-heated at 673–973 K. The wires were annealed at 293–673 K to study their annealing properties. The effects of pre-heating the hot-rolled tough pitch copper rods, including lead, on the recrystallization behaviour of the cold-drawn copper wires were investigated by tensile tests, electrical resistivity measurements and structural observations. The half-softening temperature of annealed cold-drawn copper wires decreased when the hot-rolled copper rods were pre-heated at 873 K before cold-drawing. This behaviour was attributed to separation of lead dissolved in the copper matrix which is known to lower the half-softening temperature.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 87 (1994), S. 1083-1089 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A concept, a construction and an account of commissioning experiments up to May 1993 are given for the recently completed ultra-slow positive muon facility at the pulsed muon facility of UT-MSL/KEK. The intense and ultra-slowμ + beam with an extremely small phase-space volume to be produced in this facility will open new muon sciences includingμSR studies on material surfaces.
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  • 7
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Evidence for the emission of slow muonium atoms from a 3.0-nm-thick SiO2 layer covered on an n-type Si is reported. Also, upon applying an rf-resonance technique at the muon frequency, a time-differential observation of a delayed state-change from muonium to diamagnetic muon at room temperature was observed. Combining results obtained by use of longitudinal field decoupling and transverse spin rotation methods, the conversion rate was estimated to be 5 to 10 μs−1. Both of the above results, namely the observation of the emission and state-change of muonium, suggest a process in which μ+ initially captures an electron from Si, then quickly converts to μ+ again during thermal diffusion in the Si towards the SiO2 layer. Within the oxide layer, muonium is again formed and subsequently is emitted from the SiO2 surface.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 65 (1991), S. 1159-1165 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new type of beam transport system for secondary light charged particles (“Large Ω” Beam Course) has been constructed and used to transport surface muons from the decay of pions produced in heavy-ion reactions at RIKEN Ring Cyclotron (RRC). In an experiment carried out using a14N beam of 135 MeV/u and a carbon target of 0.9 g/cm2 thickness, the surface muon intensity obtained in 5×5 cm2 sample was around 100 1/s for 500 nA of the primary beam. This number may be increased by two orders if the energy were doubled.
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  • 9
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muonium has been observed in powdered platinum (30 nm diameter) andgold (100 nm diameter), respectively, placed in vacuum by the muonium spin rotation (MuSR) technique at ambient temperature. Upon introducing gaseous oxygen up to 23 Torr into platinum powder, the muonium signal was eliminated, indicating that the observed muonium stays outside the platinum particles. The result on the platinum surface treated by hydrogen but exposed to oxygen gas suggests a reactive collision between muonium andoxygen adsorbed atomically on the surface.
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  • 10
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A concept, a design, a construction and an account of commissioning experiments are given for the recently completed ultra-slow muon facility at the pulsed muon facility of UT-MSL/KEK. The intense (more than 103/s) slow μ+ beam with an extremely narrow phase-space volume (0.2 eV×(3 cm)2) to be produced in this facility will open a new muon science including surface physics and chemistry and fundamental atomic physics.
    Type of Medium: Electronic Resource
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