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  • 1
    Electronic Resource
    Electronic Resource
    Improved low frequency seismic noise isolation system for gravitational wave detectors (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2781-2784 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An improved three-stage low frequency seismic noise isolation system for gravitational wave detectors, based on the cantilever spring, is presented. The measurement results show that the vertical and horizontal displacements of the test mass, at 10 Hz, reach 7×10−13 m/Hz and 1×10−12 mHz, respectively, and the isolation ratios of the system come to about 60 dB vertically and over 50 dB horizontally. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149016
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  • 2
    Electronic Resource
    Electronic Resource
    Epifilm thickness measurements using Fourier transform infrared spectroscopy: Effect of refractive index dispersion and refractive index measurement (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2448-2454 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Procedures and results of refractive index measurements using a Fourier transform infrared spectrometer are reported. These measurements were performed on both lightly and heavily doped silicon samples over the midinfrared (2.5–25 μm) spectrum region. A strong dependence of refractive index as a function of substrate dopant concentration was observed. Moreover, it was observed that the refractive index of heavily doped silicon also varies significantly with wavelength. Furthermore, it was also observed that the refractive index of silicon decreases with increasing wafer temperature for long wavelengths. Finally, the effect of refractive index dispersion on epifilm thickness measurement was examined. The results suggest that the spectral dispersion of the refractive index cannot be neglected for epifilm thickness measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357595
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  • 3
    Electronic Resource
    Electronic Resource
    Photoluminescence from submicron CaF2:Nd films grown epitaxially on Si(111) and Al(111)/Si(111) (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1757-1759 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd3+ doped CaF2 films have been grown epitaxially on Si(111) and Al(111)/Si(111) using CaF2 and NdF3 evaporation. Photoluminescence spectra from these samples show high intensity and narrow emission linewidth even when the thickness of the CaF2:Nd films is reduced to 0.2 μm. The 10 457 A(ring) emission line is not quenched until the Nd concentration exceeds 3.8 wt.%. Moreover, while similar spectra are observed, the photoluminescence intensity from the CaF2:Nd films grown on Al/Si(111) is significantly higher than from the CaF2:Nd on Si(111).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108417
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  • 4
    Electronic Resource
    Electronic Resource
    Field emission property of highly ordered monodispersed carbon nanotube arrays (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3127-3129 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A template-synthesis technique based on self-ordered hexagonal nanopore alumina templates was applied to synthesize highly ordered carbon nanotube arrays via thermal decomposition of ethylene with iron as the catalyst electrodeposited into the bottom of the pores. The resultant carbon nanotubes are monodispersed and have open ends with uniform sizes. It was found that the insulating oxide layer lying between the carbon nanotubes and the underlying aluminum greatly obstructs the electron emission from the carbon nanotube arrays. After the oxide layer was removed, the arrays exhibited excellent field emission properties with a threshold electric field of ∼2.8 V/μm and emission current density of 0.08 mA/cm2 at 3.6 V/μm. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1372205
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  • 5
    Electronic Resource
    Electronic Resource
    Simple and high-yield method for synthesizing single-crystal GaN nanowires (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1961-1963 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple and high-yield method involving vapor-liquid-solid wire-like growth mechanism was developed for the synthesis of GaN nanowires. In this process, the mixture of Ga and SiO2 reacted with ammonia in the presence of the Fe2O3 catalyst supported by Al2O3. The x-ray powder diffraction measurement and transmission electron microscopy observations confirmed that the synthesized GaN nanowires are single-crystal hexagonal wurtzite structure with diameters ranged from 10 to 50 nm and lengths up to several micrometers. Based on the fact that a small Fe dominant particle attached to one end of some nanowires, a growth model of the GaN nanowires was proposed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1312853
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  • 6
    Electronic Resource
    Electronic Resource
    A deuterium nuclear magnetic resonance investigation of orientational order and director kinetics in aramid solutions (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3255-3267 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied the molecular orientational order and director kinetics of the nematic phase formed by dissolving poly-p-phenylene-terephthalamide (PPTA) in sulphuric acid using deuterium NMR spectroscopy. Measurements were made on standard polymer samples using deuterated sulphuric acid and with deuterated PPTA in normal H2SO4. The influence of temperature and polymer concentration on the quadrupolar splittings which reflect the orientational order of the solvent and the solute are reported. The biphasic gap, between the nematic and the isotropic phase, for an 8.84%(w/w) solution was found to be about 10 °C. The influence of polymer concentration on the orientational order of the polymer solute is consistent with the predictions of a modified Maier–Saupe theory. By measuring the time dependence of the spectra the kinetics of field-induced director reorientation has been studied. The reorientation process from a multidomain sample to a uniform director alignment can be adequately described using an approach in which the different domains are decoupled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467573
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance study of ligand binding to manganese-aspartate transcarbamylase (1975)
    s.l. : American Chemical Society
    Biochemistry 14 (1975), S. 2219-2224 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00681a027
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  • 8
    Electronic Resource
    Electronic Resource
    Properties of the System N2O4⇆ 2NO2⇆ 2NO + O2. (1962)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 7 (1962), S. 183-186 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60013a007
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  • 9
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance in sputtered magnetic superlattices (invited) (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5931-5931 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, large values of saturation magnetoresistance (SMR) were reported in single-crystal Fe/Cr superlattice structures prepared by molecular-beam-epitaxy (MBE) techniques.1 We have prepared similar polycrystalline superlattice structures by dc magnetron sputtering in a high-vacuum deposition system and find comparably high SMR values of up to 50% for Cr-layer thicknesses of (approximately-equal-to)8 A(ring). Magnetization-versus-field data suggest that successive Fe layers are coupled antiferromagnetically with one another, as for the MBE-grown films. Magnetic fields of up to 20 kOe are required to align Fe layers 20 A(ring) thick, implying substantial exchange-coupling energies between the Fe layers. While the magnetization curves have a weak temperature dependence even for temperatures above the Néel temperature of bulk Cr, the SMR decreases as the temperature is increased. Work on related structures which do and do not show giant SMR effects will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346017
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  • 10
    Electronic Resource
    Electronic Resource
    Modelling the soil-plant-atmosphere continuum in a Quercus–Acer stand at Harvard Forest: the regulation of stomatal conductance by light, nitrogen and soil/plant hydraulic properties (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Our objective is to describe a multi-layer model of C3-canopy processes that effectively simulates hourly CO2 and latent energy (LE) fluxes in a mixed deciduous Quercus-Acer (oak–maple) stand in central Massachusetts, USA. The key hypothesis governing the biological component of the model is that stomatal conductance (gs) is varied so that daily carbon uptake per unit of foliar nitrogen is maximized within the limitations of canopy water availability. The hydraulic system is modelled as an analogue to simple electrical circuits in parallel, including a separate soil hydraulic resistance, plant resistance and plant capacitance for each canopy layer. Stomatal opening is initially controlled to conserve plant water stores and delay the onset of water stress. Stomatal closure at a threshold minimum leaf water potential prevents xylem cavitation and controls the maximum rate of water flux through the hydraulic system. We show a strong correlation between predicted hourly CO2 exchange rate (r2= 0.86) and LE (r2= 0.87) with independent whole-forest measurements made by the eddy correlation method during the summer of 1992. Our theoretical derivation shows that observed relationships between CO2 assimilation and LE flux can be explained on the basis of stomatal behaviour optimizing carbon gain, and provides an explicit link between canopy structure, soil properties, atmospheric conditions and stomatal conductance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00456.x
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