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  • 1
    Electronic Resource
    Electronic Resource
    A 200 MHz surface acoustic wave resonator mass microbalance (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1624-1629 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Surface acoustic wave (SAW) piezoelectric sensors typically used by researchers in analytical applications are based on SAW delay lines. We report here the development of a 200 MHz SAW instrument based on a SAW resonator instead of a conventional delay line. The instrument is small, compact and uses two separate 200 MHz resonator crystals which operate in the dual difference mode. The difference frequency stability is better than 55× 10−9 (±1 Hz) which is comparable to a 10 MHz bulk crystal (on an absolute frequency basis) and at least an order of magnitude better than other commercially available SAW delay lines that operate at comparable frequencies. The mass sensitivity is about 9 × 1010 Hz cm2/g. Response to temperature change is found to be about 20 Hz/°C from −30 °C to 30 °C. Response to pressure is found to be linear from 760 to 415 Torr at 3 Hz/Torr. Detection limits for HCl vapors were determined to be in the low ppb range using a SAW resonator coated with triethanolamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142442
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  • 2
    Electronic Resource
    Electronic Resource
    A STATISTICAL APPROACH TO THE SUBJECTIVE AND OBJECTIVE MEASUREMENTS OF ODORS INDUCED BY γ-IRRADIATION OF BEEF FAT (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 38 (1973), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1973.tb01434.x
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  • 3
    Electronic Resource
    Electronic Resource
    γ-IRRADIATION OF BEEF FAT. EFFECTS ON ODOR INTENSITY AND RANCIDITY (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 38 (1973), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1973.tb01435.x
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetostriction of dilute alloys of transition metal in nonmagnetic host metal
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 72 (1988), S. 300-306 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(88)90226-0
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  • 5
    Electronic Resource
    Electronic Resource
    Acute effects of trimetazidine evaluated by exercise testing (1987)
    Springer
    European journal of clinical pharmacology 33 (1987), S. 205-207 
    Details
    ISSN: 1432-1041
    Keywords: trimetazidine ; angina pectoris ; exercise testing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A single dose of 60 mg trimetazidine (the normal daily dose) improved exercise capacity in angina pectoris, as reflected by an increase in the duration of exercise, total work performed, and improvement in ECG signs of ischaemia. All these effects occurred without any detectable chronotropic or vasomotor effect. The importance of this study is to demonstrate that these beneficial effects, already well-recognized after chronic administration of 20 mg three times a day, also occur after a single administration equivalent to the normal daily dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544569
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  • 6
    Electronic Resource
    Electronic Resource
    Diffraction d'une Onde Acoustique par une Paroi Absorbante: Nouvelles Equations Intégrales (1987)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 9 (1987), S. 431-454 
    Details
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: We present here a new formulation of the exterior Robin problem of the reduced wave equation, using boundary integrals with the jumps of the function and its normal derivative as variables. Our system of integral equations present an important advantage for any numerical purpose: it can be transformed in a variational problem where the sesqui-linear form is coercive and is exempt of hyper singular integrals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mma.1670090131
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of storage conditions for tritiated thymidine as reference organically-bound tritium in urine (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 226 (1997), S. 229-231 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Interlaboratory intercomparison exercises have used tritiated thymidine as a reference material for organically-bound tritium (OBT) measurements in urine. We have examined the effects of storage conditions on the degradation behavior of tritium from OBT to tritiated water (HTO) in artificial and natural human urine samples. Tritiated thymidine decomposed less readily in artificial urine than natural urine samples. The degradation rate of tritiated thymidine in artificial urine, at −20°C, is about 10% for the first month. The rate of tritium conversion from OBT to HTO is the same at 4°C, but this storage temperature is less preferable, because of the danger of microbial contamination in the reference samples. The storage of the reference urine samples beyond three months after the preparation date is not recommended for quality control measurement data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063653
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  • 8
    Electronic Resource
    Electronic Resource
    A Rapid Fecal Bioassay Method for Pu/Am (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 243 (2000), S. 291-294 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Fecal radiobioassay is a sensitive tool to estimate intake of radionuclides, especially for insoluble or poorly absorbed actinides. To increase efficiency and reduce turnaround time, improvements were introduced in the sample digestion step of a fecal bioassay method to rapidly detect Pu and Am. The acid- and microwave-digestion of the spiked fecal samples (5–10 g) were effectively completed in 1 h. The turnaround time for the sample analysis was minimized to 6 h. The average recoveries for Pu and Am were 35% and 60% for artificial fecal samples, respectively. Much better recoveries for Pu and Am were obtained for natural fecal samples. Observed relative biases for Pu and Am were marginally in the range of -0.25 to +0.50. The relative precision values for both radionuclides were, however, within the performance index of 0.4. This rapid fecal method is a potential candidate for an acceptable quantitative radiobioassay and screening method for the suspected Pu/Am exposures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1016054921061
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of Tritium Exposures by Measuring Tritiated Metabolites in Urine (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 243 (2000), S. 567-571 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A high-performance liquid chromatography (HPLC)-based method was developed to look for the presence of characteristic urinary metabolites associated with different tritium-exposure situations. Non-volatile metabolites in urine were isolated by evaporating an aliquot of urine samples, at room temperature under nitrogen, from animals percutaneously exposed to tritiated thymidine, tritiated formaldehyde, tritium-gas-contaminated metal surfaces and tritiated pump oil. A total of 40 fractions were collected at 1 min intervals with a flow rate of 1 ml·min-1, and their tritium activities were measured. The activity profile of tritium showed that the ratios of non-volatile tritiated metabolites in fraction I (0–20 min) to fraction II (20–40 min) were noticeably different among the animals exposed to tritiated thymidine (77.2±4.5), tritiated formaldehyde (40.9±3.3), tritium-gas-contaminated metal surfaces (16.5±2.5), or tritiated pump oil (8.7±0.4) 24 h post-exposure. Our results suggest that, if the nature of a tritium exposure is unknown, comparison of the ratio of fraction I to fraction II in non-volatile tritiated metabolites may be useful in characterizing the source and the nature of tritium exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1016035811491
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  • 10
    Electronic Resource
    Electronic Resource
    A principle of images for absorbing boundary conditions (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Numerical Methods for Partial Differential Equations 10 (1994), S. 411-434 
    Details
    ISSN: 0749-159X
    Keywords: Mathematics and Statistics ; Numerical Methods
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: When one uses high-order finite difference schemes for the wave equation, for instance fourth order schemes, the treatment of boundary conditions poses a real difficulty since one needs several additional equations (for the nodes close to the boundary), while one single scalar boundary condition is available. In the case of perfectly reflecting boundary conditions, namely the homogeneous Neumann or Dirichlet conditions, this difficulty can be overcomed by the use of the well-known image principle, which permits the extension of the equation outside of the domain of calculation by an appropriate symmetrization of the data. We propose in this article a generalization of this principle to the absorbing boundary conditions. Through a symmetrization process, we are led to introduce a damped wave equation with a damping term supported by the boundary. The treatment of the boundary condition is then replaced by the approximation of this new damped wave equation in the whole space. The theoretical justification of our approach is based on new energy estimates for the wave equation (when high-order absorbing boundary conditions are used), and constitutes an alternative to the use of the well-known Kreiss criterion to prove the stability of the associated initial boundary value problems. © 1994 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/num.1690100403
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