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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5168-5170 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of optical transitions between higher conduction subbands and higher heavy-hole subbands have been observed between 77 K and room temperature in photocurrent spectra of p-i-n photodiodes including 5-nm-wide InGaAs/InAlAs multi-quantum wells. The quadratic dependence of the transition energy on the heavy-hole quantum number, l=1,2 and 3, has been clarified for each conduction-electron quantum number, n=1 and 2. This experiment evidences the applicability of a particle-in-a-box model to the energy level determination. The carrier effective masses in InGaAs wells and the related band discontinuities were analyzed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3994-4001 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermal diffusivity, and specific heat, of polyethylene (76% crystallinity) containing dispersed particles (1%–15% volume fraction) of SiO2 (diameter d=7,16,40 nm; 1,5,10 μm), Fe (d=27 nm), Cu (d=53 nm), and Ag (d=140 nm) have been measured using the laser flash method, and the thermal relaxation method, in the temperature range of 4.2–300 K, and the thermal conductivity was derived from the two quantities. The thermal conductivity was decreased by the addition of particles, and the decrease was more remarkable at lower temperatures for smaller particles. The boundary thermal resistance between the particles and the medium was derived from the change of conductivity due to the nm-diameter dispersed particles. The boundary resistance was independent of the size and the volume fraction of the particles, and was shown to be inversely proportional to the phonon specific heat of particle-dispersed medium in over a wide range of temperatures. The phonon Debye temperature and the strength of the boundary thermal resistance were determined by analyzing the data, and obtained results were quite reasonable. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is reported that Nd-Fe-B magnetic powders prepared by utilizing the HDDR (hydrogenation, disproportionation, desorption, and recombination) phenomena exhibit high coercivity, and the addition of Co, Ga, and Zr induces magnetic anisotropy in these powders. HDDR phenomena are caused by the heat treatment in hydrogen (H treatment) and subsequently in vacuum (V treatment). Present works describe the effects of V-treatment conditions on magnetic properties of Nd12.6Febal.CoxB6.0 (x=0–17.4) alloys. The powders V-treated at lower temperature show lower remanence and no noticeable magnetic anisotropy. V treatment at higher temperature enhances remanence and increases the differences of remanence between the powders aligned with and without magnetic field. Higher values are obtained in Co added alloys. This result suggests that a selective grain growth of Nd2Fe14B grains during V treatment plays an important role for the inducement of magnetic anisotropy in HDDR-treated powders. The temperature for complete recombination reaction under evacuating condition decreases with increasing Co content. It can be said that Co addition enhances recombination reaction and results in acceleration of grain growth.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1895-1898 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied low frequency (1/f) noise of YBa2Cu3O7−δ dc superconducting quantum interference devices (SQUIDs) on SrTiO3 bicrystal substrates. 1/f flux noise, either measured at different temperatures for optimized bias current or measured at 77 K for different bias currents, is almost constant. These facts imply that 1/f noise mainly comes from fluctuations of the critical current of the Josephson junction that form the SQUID. Also, we explain the critical current fluctuations in the junction by an equilibrium temperature fluctuation model.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 16 (1977), S. 1262-1267 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2122-2127 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A combination of computer simulation and experimental methods is used to provide a reliable and systematic means of optimizing the response time of active-matrix liquid crystal displays. Optical transients are measured and simulated (within a continuum elastic framework including hydrodynamic backflow) and are thereby related to director reorientation processes under various driving conditions. We find that an unconventional "overdrive" method, in which the device is briefly biased to a voltage exceeding the target voltage, leads to dramatic improvements in device response time which approach a factor of 6 in some cases. The computational model is capable of accurately predicting the optimum overdrive voltage. The physical origins of these findings and the importance of hydrodynamic backflow are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5682-5683 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Concerning the decrease of the wall motion resistive magnetic properties such as magnetocrystalline anisotropy of an electric sheet, we reported that quick quenching from 1100 °C suppressed the formation of a B2 superlattice which is roughly proportional to the anisotropy. Using iron single crystals containing 5.5 wt. % silicon with the addition of a small amount of a third element such as Mo to suppress the formation of the superlattice, we describe the quenching temperature dependence of the anisotropy and saturation magnetization. A remarkable decrease of room-temperature anisotropy was found in crystals with the additional element compared to those without the element.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5528-5530 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analytical microscopy characterization was carried out on rapidly quenched Nd-Fe-Zr-B magnets with 9–10 at. % Nd contents. These magnets had a high-energy product (15–17 MGOe). The microstructure of these alloys consisted of two phases where 20–40 nm size Nd2Fe14B grains were surrounded by a 2–20-nm-thick Nd-poor and Fe-rich grain-boundary phase. It is proposed that the Fe-rich boundary phase leads to higher remanence and higher energy products than those found in Nd-Fe-B ternary alloys.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3346-3348 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied Faraday rotation and magnetic properties of Co-Ti substituted barium ferrite films with perpendicular anisotropy, which were prepared by targets-facing-type sputtering method on (111) oriented GGG substrates. Faraday rotation (θF) of 500–830 nm was measured by using the Faraday modulation method. It was found that θF increased proportionally to the content of cobalt in the wavelength range 700–830 nm. In the BaFe10.42Co0.78Ti0.8O19 film, Faraday rotation and magnetic properties were as follows: θF=0.75 deg/μm at 780 nm, anisotropy field: Hk=5.2 kOe, coercive force: Hc=800 Oe, Curie temperature: TC=380 °C. Thermomagnetic recording was achieved on this film by using a 780-nm laser diode. As a result, 2.0-μm bit patterns were observed by Faraday effect.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Beam position stability was found to be largely affected by the distortion of the storage ring building, especially when the beam emittance was lowered. Building distortion in the horizontal direction was noticed as the diurnal deviation of the orbit circumference. The deviation was measured by reading the amount of rf frequency variation necessary to recover the horizontal central orbit. The deviation of the orbit circumference was interpreted to be induced from the ring floor expansion. Such diurnal expansion of the ring floor was evaluated by using a model simulation that dealt with the distortion of the ring building under thermal stress. To reduce such thermal stress, the rooftop of the building was insulated. The deviation of the ring circumference measured after insulation was reduced to one-half of that measured before. The simulation also gave the same amount of deviations as measured before and after insulation.
    Type of Medium: Electronic Resource
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