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  • 1
    Electronic Resource
    Electronic Resource
    A route to functionalized branched-chain amino sugars via nitrous acid promoted spiroaziridine formation (1988)
    s.l. : American Chemical Society
    The @journal of organic chemistry 53 (1988), S. 4616-4618 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00254a048
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  • 2
    Electronic Resource
    Electronic Resource
    Comment on the interpretation of the spectral functions {aj,k(z)} in dual Lanczos transformation theory (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7611-7612 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We comment on the interpretation of the spectral functions {aj,k(z)} [J. Chem. Phys. 88, 1837 (1988)] appearing in dual Lanczos transformation theory. It is shown that these functions are not, in general, equivalent to the Laplace transforms of the matrix elements of the system propagator in the dual Lanczos representation. In fact, we show that these functions may be used to construct the Laplace transforms by performing a suitable contour integration. New and useful expressions for the Laplace transforms are obtained, which reveal that they differ from the spectral functions {aj,k(z)} by an analytic piece that is unimportant for time evolution computations but it is of critical importance in spectral density computations. The utility of our results is illustrated by constructing the appropriately corrected expressions for the Fourier–Laplace transforms of the elements of the correlation matrices associated with first and second moment coordinate and momentum fluctuations for the Brownian harmonic oscillator [J. Chem. Phys. 88, 1854 (1988)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456199
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  • 3
    Electronic Resource
    Electronic Resource
    Bonding structure in amorphous carbon nitride: A spectroscopic and nuclear magnetic resonance study (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 675-681 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Since the prediction of Liu and Cohen [Science 245, 841 (1989)] of the potential extraordinary mechanical properties of crystalline β-C3N4, many authors have attempted its synthesis. However, in most cases, the obtained materials are amorphous phases with a complex bonding structure. Their characterization is complicated due to the absence of a reference compound, the lack of long-range order, and the poor knowledge about their bonding structure. In this article, we present 1H, 13C, and 15N solid-state nuclear magnetic resonance (NMR) measurements for the determination of the bonding types in amorphous CNx films. NMR measurements do not require long-range order and are able to clearly identify the signals from the sp2- and sp3-bonded phases. The analysis of the data obtained by other characterization techniques, such as infrared spectroscopy, x-ray photoelectron spectroscopy, electron energy-loss spectroscopy, and x-ray absorption near-edge spectroscopy on the same sample, based on the information acquired by NMR, enables the description of a structure model for the studied amorphous-CNx phase prepared by dc-magnetron sputtering and to revise the interpretation found in the literature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1380998
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  • 4
    Electronic Resource
    Electronic Resource
    Stationarity of time correlation functions for globally linear classical systems and its consequences (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 2466-2479 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A necessary and sufficient condition for the stationarity of all time correlation functions associated with a given globally linear classical dynamical system is rigorously established from basic principles. Since stationarity of time correlation functions is a physical requirement that must be satisfied, the necessary and sufficient condition obtained for its realization represents a universal dynamical constraint on globally linear classical dynamical models intended to describe the execution of spontaneous fluctuations about a stationary state. This dynamical constraint is shown to (i) impose restrictions on the symmetry properties of the transition operator appearing in the global propagator for a system; (ii) represent a universal operator relation that embodies detailed balance and microscopic reversibility, giving rise to their traditional formulations; and (iii) imply the existence of certain generalized symmetry relations for time correlation functions and their Laplace and Fourier transforms. Apart from elucidating some fundamental symmetries of classical dynamical systems, the reported theory has the advantage of providing a simple model independent framework for treating classical time correlation functions via the extraction and utilization of dynamically embedded information. This is demonstrated in a concrete way by exploiting the mathematical apparatus of dual Lanczos transformation theory to determine the advanced and retarded components of the elements of the correlation matrices for first and second moment coordinate and momentum fluctuations for the Brownian harmonic oscillator. The Laplace transforms of the retarded components of the time correlation functions and the Fourier transforms of the full-time correlation functions are also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528990
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  • 5
    Electronic Resource
    Electronic Resource
    Self-normalized photothermal techniques for thermal diffusivity measurements (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 6815-6820 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two self-normalized photothermal techniques, to carry out thermal diffusivity measurements of condensed phase materials, are presented. These simple methodologies involve linear fitting procedures of the signal amplitude and phase. These procedures lead to the elimination of the usual requirement for instrumental transfer-function normalization. The thermal diffusivities for two dental resins and two pure liquids are measured with these simple methodologies and very good agreement is found with values reported in the literature, where more involved analysis is usually required. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1324694
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal diffusivity measurements in the photoacoustic open-cell configuration using simple signal normalization techniques (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2273-2279 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized model for the open photoacoustic cell configuration (OPC) technique, involving one-dimensional heat diffusion across two layers, is presented. The analytical results are particularly suitable for applications with dielectric solids, such as polymers and resins. Two effective normalization procedures for simple and reliable measurement of the thermal diffusivity of this kind of materials using an OPC are also presented. The thermal diffusivity of three different materials (a dental resin, an epoxy resin, and a polymer foil) was measured and excellent agreement was obtained with some values reported in the literature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1391224
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal-wave resonator cavity design and measurements of the thermal diffusivity of liquids (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 2933-2937 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A liquid-ambient-compatible thermal wave resonant cavity (TWRC) has been constructed for the measurement of the thermal diffusivity of liquids. The thermal diffusivities of distilled water, glycerol, ethylene glycol, and olive oil were determined at room temperature (25 °C), with four-significant-figure precision as follows: (0.1445±0.0002)×10−2 cm2/s (distilled water); (0.0922±0.0002)×10−2 cm2/s (glycerol); (0.0918±0.0002)×10−2 cm2/s (ethylene glycol); and (0.0881±0.0004)×10−2 cm2/s (olive oil). The liquid-state TWRC sensor was found to be highly sensitive to various mixtures of methanol and salt in distilled water with sensitivity limits 0.5% (v/v) and 0.03% (w/v), respectively. The use of the TWRC to measure gas evolution from liquids and its potential for environmental applications has also been demonstrated. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150713
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  • 8
    Electronic Resource
    Electronic Resource
    Multipurpose 10 in. manipulator-based optical telescope for Omega and the Trident laser facilities : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 803-805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have recently designed and are building a telescope which acts as an imaging light collector relaying the image to an optical table for experiment dependent analysis and recording. The expected primary use of this instrument is a streaked optical pyrometer for witness plate measurements of the hohlraum drive temperature. The telescope is based on the University of Rochester's 10 in. manipulator (TIM) which allows compatibility between Omega, Trident, and the NIF lasers. The optics capture a f/7 cone of light, have a field of view of 6 mm, have a spatial resolution of 5–7 μm per line pair at the object plane, and are optimized for operation at 280 nm. The image is at a magnification of 11.7×, which is convenient for many experiments, but can be changed using additional optics that reside outside the TIM. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149403
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  • 9
    Electronic Resource
    Electronic Resource
    A new CO2 analyzer for measuring respiration rates in organic material (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3732-3736 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article, we present a new CO2 analyzer which can be used for monitoring respiration rates in organic material. To demonstrate the potentiality of the analyzer, CO2 evolution of soil samples collected from three different edaphic environments were measured. The results obtained with this compact CO2 analyzer were compared with those carried out simultaneously using the chemical method, and the correlation between them has been established. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147140
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  • 10
    Electronic Resource
    Electronic Resource
    The yeast GAL1-10 upstream activation sequence region readily accepts nucleosomes in vitro (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 7486-7490 
    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/bi00444a048
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