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  • 1
    Online Resource
    Online Resource
    Purity analyses of high-purity organic compounds with nitroxyl radicals based on the Curie–Weiss law
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 117, No. 17 ( 2015-05-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 117, No. 17 ( 2015-05-07)
    Abstract: This work reports an attempt to quantify the purities of powders of high-purity organic compounds with stable nitroxyl radicals (namely, 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO), 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine (TEMPOL), and 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl benzoate (4-hydroxy-TEMPO benzoate)) in terms of mass fractions by using our “effective magnetic moment method,” which is based on both the Curie–Weiss law and a fundamental equation of electron paramagnetic resonance (ESR). The temperature dependence of the magnetic moment resulting from the radicals was measured with a superconducting quantum interference device magnetometer. The g value for each compound was measured with an X-band ESR spectrometer. The results of the purities were (0.998 ± 0.064) kg kg−1 for TEMPO, (1.019 ± 0.040) kg kg−1 for TEMPOL, and (1.001 ± 0.048) kg kg−1 for 4-hydroxy-TEMPO benzoate. These results demonstrate that this analytical method as a future candidate of potential primary direct method can measure the purities with expanded uncertainties of approximately 5%.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4913725
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Dynamic properties of double-stranded DNA by normal mode analysis
    AIP Publishing ; 1999
    In:  The Journal of Chemical Physics Vol. 110, No. 22 ( 1999-06-08), p. 11070-11075
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 110, No. 22 ( 1999-06-08), p. 11070-11075
    Abstract: We have carried out normal mode analysis for four B-DNA molecules with different lengths and sequences. By focusing our attention on motions of the helical axes of the molecules and comparing them with those of the ideal rod obeying vibrational theory, we have shown that DNA molecules behave like isotropic and homogeneous elastic rods. Then, we have calculated dynamic constants representing their rigidities for bending and twisting. In the analysis of their twisting motions, we have shown that sliding and shifting motions between adjacent bases are important for the motions.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.479043
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 3
    Online Resource
    Online Resource
    Multistage gas–surface interaction model for the direct simulation Monte Carlo method
    AIP Publishing ; 1999
    In:  Physics of Fluids Vol. 11, No. 11 ( 1999-11-01), p. 3540-3552
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 11, No. 11 ( 1999-11-01), p. 3540-3552
    Abstract: A multistage (MS) gas–surface interaction model for a monatomic/diatomic gas molecule interacting with a solid surface is presented, based on the analysis of molecular dynamics (MD) simulations and a model equation derived from the classical theory of an ellipsoid hitting a hard cube. This model is developed for use with the direct simulation Monte Carlo (DSMC) method and belongs to the thermal scattering regime. The molecular dynamics method is used for the molecular-level understanding of the scattering of O2, N2, and Ar from a graphite surface. The basic idea of the model is to separate the collision into three stages. At stages 1 and 2, the energy and scattering direction are determined by the model equation. At stage 3, according to the translational energy, the molecule is determined to scatter, re-enter or be trapped by the surface. Re-entering molecules return to stage 1. The model parameters are determined from our MD database. Experiments are also performed by scattering a supersonic O2 molecular beam from a clean graphite surface in an ultrahigh vacuum chamber. The in-plane scattering distribution, out-of-plane scattering distribution, and in-plane velocity distribution of the model show good agreement with those of molecular beam experiments. A model equation was included in the MS model to maintain thermal equilibrium between a gas and a surface at the same temperature when applied to DSMC simulations and the results are also shown. The high accuracy of the model clearly shows that such multiple-scale analysis can lead to the development of realistic models of the gas–surface interaction.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.870211
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 4
    Online Resource
    Online Resource
    Normal mode analysis of a double-stranded DNA dodecamer d(CGCGAATTCGCG)
    AIP Publishing ; 1997
    In:  The Journal of Chemical Physics Vol. 107, No. 9 ( 1997-09-01), p. 3684-3690
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 107, No. 9 ( 1997-09-01), p. 3684-3690
    Abstract: The normal mode analysis in dihedral angle space is carried out on a famous double-stranded DNA dodecamer d(CGCGAATTCGCG) to reveal the dynamical characteristics and internal motion of this molecule. We have observed the coupled motion of sugar and base. We have also noted the dependence of internal motion in the dodecamer on location of the nucleotide relative to the helical ends, and the dependence of atomic fluctuations on distance from the helix axis. The similarity of atomic fluctuations between two strands suggests the presence of a twofold pseudosymmetry axis with its origin located at the center of the molecule. Our results show that the atomic fluctuations of duplex DNA are mainly determined by a small number of low-frequency normal modes, the normal modes with frequencies below 30 cm−1 make major contributions to the site-dependence of atomic fluctuations.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.474724
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    C -axis oriented L1 phase FePt thin films by plasma-assisted diffusion
    AIP Publishing ; 2005
    In:  Journal of Applied Physics Vol. 97, No. 10 ( 2005-05-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 97, No. 10 ( 2005-05-15)
    Abstract: L 1 0 phase FePt thin films with different crystal orientation have been prepared by deposition of Fe and Pt separately from the corresponding targets using dc magnetron sputtering and in situ substrate heating. The codiffusion of the Fe and Pt atoms are attributed by the surface bombardment from high energy ions in plasma. The transformation temperature for L10 phase FePt is as low as 250°C by this technique. The crystal orientation of the obtained FePt films with L10 structure is determined by the orientation of the initial Fe layer.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1850382
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Large birefringence and polarization holographic gratings formed in photocross-linkable polymer liquid crystals comprising bistolane mesogenic side groups
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 106, No. 7 ( 2009-10-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 106, No. 7 ( 2009-10-01)
    Abstract: Polarization gratings with large birefringence are formed in photoreactive polymer liquid crystals with bistolane moiety and terminal cinnamic acid moiety by the use of polarized ultraviolet interference light and subsequent annealing. The polarized ultraviolet light causes the axis-selective photoreaction between the cinnamic acid groups and subsequent annealing induce the reorientation of peripheral molecules without cross-linking along the cross-linked groups. Long bistolane mesogenic moiety exhibits large birefringence in comparison with a biphenyl mesogenic moiety, the value of the induced birefringence in the bistolane mesogenic liquid crystalline (LC) polymer is strongly dependent on both the grating constant and the wavelength of the reconstruction light.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3234385
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    System analysis of the force-feedback method for force curve measurements
    AIP Publishing ; 1999
    In:  Review of Scientific Instruments Vol. 70, No. 5 ( 1999-05-01), p. 2402-2407
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 70, No. 5 ( 1999-05-01), p. 2402-2407
    Abstract: The force-feedback method is a promising technique to measure accurate force curves in atomic force spectroscopy. In this article, we describe criteria of the stability for the force-feedback system containing a proportional amplifier with first-order lag. We derive the criteria from an equation of the cantilever movement with higher-order vibration modes under force interaction. The criteria predict that a proportional amplifier with a certain gain and a “very high” cutoff frequency is required to stabilize the feedback system when the critical force gradient exceeds the cantilever stiffness. To measure a force curve, including the steep part (−17 N/m) with a soft (0.2 N/m) and poor-damping (2×10−7 kg/s) cantilever, the amplifier for the force-feedback controller must have a frequency response wider than 16 MHz and gain larger than 16.8. Moreover, the feedback controller with only an integrator, which is popular in scanning tunneling microscopy and atomic force microscopy, does not contribute to reducing the discontinuity of the force curve.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1149768
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1999
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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