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  • 1995-1999  (23)
  • 1990-1994  (24)
  • 1
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Diamagnetic muon yields (P D) in (Al x Co1−x )(acac)3 and (Ga x Co1−x )(acac)3 systems were investigated. Both in (Al x Co1−x )(acac)3 and (Ga x Co1−x )(acac)3, Co(acac)3 was more influential on diamagnetic muon yield than Al(acac)3 and Ga(acac)3. Zerofield muon spin relaxation rate suggests that the diamagnetic muon resides in the vicinity of Co(acac)3 molecules.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-1536
    Keywords: ζ-potential ; surface charge density ; binding constant ; aggregation number ; oil-in-water type microemulsion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of anti-symmetric electrolytes (CaCl2, Ca(SCN)2, MgCl2, and/or Mg(SCN)2) and pH on the phase behavior, the ζ-potential, the hydrodynamic diameter and the surface charge density of an oil-inwater type (O/W-type) microemulsion formed in solutions of an amphoteric surfactant (N α,N α-dimethyl-N ɛ-lauroyllysine, DMLL)/n-octane/1-pentanol/brine have been examined. The formation of the microemulsion in the presence of CaCl2 and/or Ca(SCN)2 is of Winsor-type with an increase in the concentration of 1-pentanol. Particularly, microemulsion is not formed by the addition of Ca(SCN)2 in a pH region less than 2.6. The ζ-potential and the surface charge density of the microemulsion in the presence of CaCl2 decrease with an increase in pH and show slightly positive values in the isoelectric region (pH 5-7), while, in the presence of Ca(SCN)2, the ζ-potential and the surface charge density show negative values in the same region at which the net charge of DMLL molecules becomes almost zero. The hydrodynamic diameters in the presence of CaCl2 show a maximum value around pH 2.5, whereas, in the presence of Ca(SCN)2, the minimum value is around pH 5.5. Similar tendencies are recognized in results for the ζ-potential, the hydrodynamic diameter and the surface charge density of the O/W-type microemulsion in the presence of MgCl2 and Mg(SCN)2. A new formula to estimate the binding constants (K) of Ca2+, Mg2+, Cl−, and SCN− to the hydrophilic groups in DMLL molecules and the adsorption density of DMLL molecules on the oil/water interface (N) in the presence of antisymmetric electrolytes has been derived.K for Ca2+, Mg2+, Cl−, and SCN− was found to beK Ca=0.12M−1,K Mg=0.14 M−1,K Cl=0.0084±0.0016 M−1, respectively.N for DMLL molecules in the presence of CaCl2, Ca(SCN)2, MgCl2 and/or Mg(SCN)2 was found to be 0.50 nm−2, 0.38 nm−2, 0.44 nm−2, and 0.47 nm−2, respectively; and the surfactant (DMLL) numbers per O/W-type microemulsion droplet change from a few hundreds to a few thousands with changing pH. The larger the hydrodynamic diameter of the O/W-type microemulsion, the greater the number of DMLL molecules adsorbed on the O/W-type microemulsion surfaces.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: To evaluate an experimental inorganicbone-particle-impregnated bone cement, canine hip prostheses were implanted in dogs using a regular bone cement on one side and the experimental bone cement on the other. In a preliminary feasibility study, bone ingrowth into the resorbed bone-particle spaces was established 3 months after implantation in three dogs. In a more detailed study, twenty-eight (28) dogs were divided in four groups to delineate the effects of time on the phenomena of bony ingrowth. One month after implantation, active bone ingrowth into the bone cement was obvious. By 3 months postimplantation, the ingrowth appeared to have traversed the thickness of the bone-particle-impregnated cement. By the fifth month, most of the interconnected inorganic bone particles were replaced by new bone. At the end of a year, the ingrown bone was mature and negligible new bone activity was present. Biomechanical pushout tests closely corroborated the histologic observations. The maximum shear strength of the cement/bone interface of the experimental side reached 3.6 times that of the control side at 5 months postimplantation. No further improvements were seen at 12 months postimplantation. A viable bone/cement interface may result in a better orthopedic implant fixation system by combining the advantages of both cement for immediate rigidity and biological ingrowth for longterm stability.
    Additional Material: 10 Ill.
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  • 5
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Zero‐field μSR measurements have been carried out in the paramagnetic and magnetically ordered states of the heavy fermion alloys: Ce1-xLaxRu2Si2 (x=0.05,0.13,0.25). In Ce1-xLaxRu2Si2 system, TK drastically decreases with x from 24 K for x=0 and becomes very close to the magnetic ordering temperature TN. As functions of TK and TN, the magnetic instabilities were studied in this system. For x=0.05,\ 0.13\ \mboxand\ 0.25 samples, longitudinal muon spin relaxation was measured to study non‐magnetic to magnetic transition and the change from itinerant to localized electron state with increasing La impurities. We discuss the dynamics of muon spins in the paramagnetic and antiferromagnetic state.
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  • 6
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A cluster‐glass (CG) Fe0.25Mg0.75TiO3 is investigated by muon spin relaxation measurements. It is found that the local magnetic fields at the muon stopping site are established at temperatures five times as high as the freezing temperature Tf. It is also found that the electron spins fluctuate even below Tf. The critical region around Tf in Fe0.25Mg0.75TiO3 is extremely wide in contrast to that of ordinary spin‐glass (SG) systems. It is clearly demonstrated that the microscopic and dynamical properties of CG are remarkably different from those of SG.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Zero and longitudinal field μSR measurements on diluted triangular‐lattice antiferromagnet LuFeMgO4 have revealed gradual and highly anisotropic slowing‐down of spin fluctuation. Relaxation rate \lambda in the condition with initial muon spins perpendicular to the hexagonal c‐plane shows divergent behavior while that in the parallel configuration remains finite. At certain temperature range the fluctuation of spins is suppressed by a small external magnetic field. Monte Carlo calculation suggests that the correlation time for z(c)‐component of spins diverges first on cooling.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have carried out first‐principles Unrestricted Hartree–Fock Cluster investigations to demonstrate that the Auger holes produced by the entry of μ- into the oxygen ions in La_2CuO_4 lead to stable O-μ- centers at apical and planar sites. The hyperfine fields associated with these two sites suggest that the apical one is responsible for the stronger and more anisotropic Knight shift in μSR measurements and the planar for the weaker and less anisotropic shift, the needed susceptibility arising from the localized magnetic moments on the O-μ- centers. This identification of the susceptibility provides support for the model proposed for the observed increase in μSR relaxation rate below the superconducting temperatures.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A slow conversion to a diamagnetic state has been observed for muonium centers at the tetrahedral interstitial site (Mu0 T) in dark Ge at low temperatures. While the conversion process is affected by illumination, no effect of illumination upon the initial (Mu0 T) centers themselves was observed at 10 K. This is in marked contrast with the case of (Mu0 T) centers in Si where strong interaction with photo‐induced carriers is observed, suggesting that the electronic level associated with (Mu0 T) state in Ge is not located in the energy gap.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The uniaxial pressure dependence of the muonium hyperfine tensor was measured at 80 K. Uniaxial pressures (0 and 0.2 GPa) were applied along the a‐axis of quartz, and the hyperfine tensor was measured by applying various transverse fields between 0 and 7 G. The structure appears to be the result of the three chemically equivalent sites in quartz. When pressure is applied perpendicular to the crystallographic c‐axis of quartz, the symmetry of these sites is broken such that two chemically inequivalent sites are observed. The resulting hyperfine structure is discussed and qualitative explanations are proposed.
    Type of Medium: Electronic Resource
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