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  • Electronic Resource  (14)
  • 1990-1994  (9)
  • 1980-1984  (5)
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  • Electronic Resource  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    Size-dependent magnetic properties of manganese ferrite fine particles : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5279-5281 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed synthetic techniques involving coprecipitation of iron(III) and manganese(II) ions from aqueous solutions using NaOH to create single-crystal, stoichiometric MnFe2O4 particles. The particle diameter could be varied between 5 and 25 nm by varying the metallic-ion to hydroxide-ion concentration ratio. Magnetic measurements revealed that the saturation magnetization decreased, the ferrimagnetic to paramagnetic transition broadened, and the apparent transition temperature increased, all with decreasing particle size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348048
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  • 2
    Electronic Resource
    Electronic Resource
    Hard magnetic properties of melt-spun Nd(Fe,M)12 nitrides and carbides : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6254-6256 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hard magnetic properties of melt-spun Nd(Fe,M)12 nitrides and carbides were studied. The highest coercivity was obtained in NdFe10Mo2Nx with values of 8.8 kOe at room temperature and 33.7 kOe at 10 K. Other Nd(Fe,M)12N(C)x compounds had similar intrinsic magnetic properties but a lower coercivity than NdFe10Mo2Nx. The low coercivities were attributed to the three soft sources; α-Fe, non-ThMn12 structure, and insufficient nitrogenation or carbonation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352662
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cavity-enhanced detection of surface photovaporization (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1476-1478 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cavity-enhanced detection is used to monitor minute vapor plumes produced by focusing a pulsed laser beam onto a surface placed inside a resonant optical cavity. The photovaporization signals from a variety of different materials are examined, with emphasis being placed on their amplitude and temporal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105246
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Strain induced optical waveguides in lithium niobate, lithium tantalate, and barium titanate (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 407-409 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Channel waveguides have been produced in LiNbO3, LiTaO3, and BaTiO3 ferroelectric crystals by depositing thick SiO2 films at an elevated temperature and patterning them by reactive ion etching. The static strain resulting from the large thermal expansion mismatch between the substrate and film causes a localized increase in the refractive index via the strain-optic effect. In addition, an electro-optic contribution to the index increase is believed to result from a surface charge distribution which compensates the electric field due to the piezoelectric effect. Single-mode waveguides at a wavelength of 0.633 μm for both polarizations have been produced in x-cut LiNbO3, with losses of 0.8 dB/cm for TE polarization and 0.9 dB/cm for TM polarization. The 11-μm-wide channel waveguides were formed by a z-axis strain induced by a 2.8-μm-thick SiO2 film deposited at 300 °C. Electro-optic modulation was also demonstrated in these waveguides. Guiding for both polarizations was also observed in LiTaO3 and BaTiO3 channel waveguides at 0.83 μm wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106672
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  • 5
    Electronic Resource
    Electronic Resource
    Tunable guided-wave optical polarization converters in lithium tantalate (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1059-1061 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tunable guided-wave TE↔TM mode converters have been produced in LiTaO3 using strain-induced polarization mode coupling. The waveguides are formed by Zn diffusion from the vapor phase. Phase matched coupling is obtained by depositing a thick SiO2 film at an elevated temperature and delineating a spatially periodic pattern in the film at room temperature. The static shear strain resulting from the large thermal expansion mismatch between the substrate and film causes an off-diagonal change in the refractive index via the strain-optic effect and promotes TE↔TM coupling. Polarization conversion in excess of 98% was achieved at a wavelength of 627 nm in X-cut LiTaO3. The conversion efficiency is highly wavelength selective, with a spectral width of 7.3 nm in the 5.4 mm long device. Thermal and electro-optic tuning of the center wavelength was demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108794
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  • 6
    Electronic Resource
    Electronic Resource
    Some physiological and growth responses of Betula papyrifera seedlings to flooding (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Betula papyrifera Marsh, seedlings adapted very poorly to flooding for up to 60 days. Responses to flooding included increased ethylene production; stomatal closure; leaf senescence; drastic inhibition of shoot growth, cambial growth, and root growth; decay of roots, and death of many seedlings. Flooding inhibited growth of leaves that formed prior to flooding, inhibited formation of new leaves, and induced abscission of old leaves. As a result of extensive leaf abscission, fewer leaves were present after flooding than before flooding was initiated. The drastic reduction in leaf area was associated with greatly decreased growth of the lower stem and roots. No evidence was found of adaptive morphological changes to flooding. The data indicate that intolerance of B. papyrifera seedlings to flooding is an important barrier to regeneration of the species on sites subject to periodic inundation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb04521.x
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  • 7
    Electronic Resource
    Electronic Resource
    Further studies in flood tolerance of Betula papyrifera seedlings (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 59 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Flooding of soil for 60 days drastically reduced height growth, cambial growth, dry weight increment, and relative growth rate of 150-day-old Betula papyrifera Marsh. seedlings. Comparisons of responses to flooding of 150-day-old and 230-day-old seedlings indicated important differences between the two age classes. Whereas the younger seedlings produced abundant adventitious roots on submerged portions of stems, the older seedlings did not. Flooding also induced much more leaf abscission in the older seedlings. Flooding generally reduced root-shoot ratios of both age classes, largely as a result of inhibition of growth and decay of root systems. However, root-shoot ratios were altered appreciably by formation of adventitious roots in the younger seedlings and by extensive leaf abscission in the older seedlings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb00761.x
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  • 8
    Electronic Resource
    Electronic Resource
    SHORT CRACK FATIGUE BEHAVIOUR IN A MEDIUM CARBON STEEL (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 7 (1984), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The initiation stage and short crack behaviour in torsional fatigue of a 0.4% C steel was investigated by a replication technique.The fatigue cracks initiated and propagated in the ferrite phase which is located at the prior austenite grain boundaries in the form of long allotriomorphs. At this stage of crack development it is proposed that crack growth rate depends on the extent and intensity of plasticity at the tip of the crack. Crack growth per cycle is correspondingly proportional to the strength of the slip band. The ferrite-pearlite boundaries are strong barriers to crack propagation, which is manifested by a deceleration of growth and possible arrest. On raising the stress level the previously non-propagating cracks may continue to grow by branching or joining with other cracks in the ferrite phase. This process is repeated until the stress fields of one or more dominant cracks attain a critical value to sustain continued growth that leads to failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1984.tb00408.x
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  • 9
    Electronic Resource
    Electronic Resource
    Surface Properties of Zeolite Characterized by Positron Annihilation Technique (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 175-178 (Nov. 1994), p. 667-670 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.175-178.667.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    PC-CONTIN and Some Aspects of Determination of Positron Annihilation Rate Distribution (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 175-178 (Nov. 1994), p. 1001-1004 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.175-178.1001.pdf
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