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  • 1
    Electronic Resource
    Electronic Resource
    Laser-intensity-modulation method: A technique for determination of spatial distributions of polarization and space charge in polymer electrets (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2151-2160 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method for measuring the spatial distribution of combined polarization and space charges in poled polymer electrets has been developed. The technique, called the laser-intensity-modulation method (LIMM), is based upon measurement of the pyroelectric current generated by the electret when it is heated with a laser beam which is intensity-modulated at frequencies varying from 200 to 2500 Hz. A special analytical technique is used to transform the current-frequency measurements to spatial distributions. The method gives high resolution and is very stable with respect to measurement errors. The technique can be easily implemented in a laboratory with conventional equipment. The advantages and limitations of LIMM are illustrated by means of calculations based upon simulated data. Experimental results on a number of laboratory and commercially poled samples are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336352
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  • 2
    Electronic Resource
    Electronic Resource
    Finite-difference modeling of piezoelectric composite transducers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 467-473 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The mechanical and electrical properties of transducers are modeled by finite-difference representations of the relevant physical equations, and the numerical problems are discussed. The theory is applied to (a) a ceramic transducer of dimensions 1 cm×1 cm×200 μm, (b) a polymer P of the same dimensions, and (c) a 1–3 composite transducer consisting of transverse rods of ceramic embedded in a matrix of polymer. The results for the ceramic agree with the one-dimensional model, viz.:voltage of order 4–5 μV and no resonance below 10 MHz. For the polymer, the resonant frequency of 3.9 MHz is close to the 4 MHz predicted by the one-dimensional theory. For the composite, introduction of the ceramic has an immediate effect on s11, s12 and s13, whereas it has little effect on d31 unless the density of the ceramic in the mix is 30% or higher. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371885
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  • 3
    Electronic Resource
    Electronic Resource
    Semiempirical stopping power equation for positrons (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 461-463 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A semiempirical equation for the total stopping power for positrons in elements, compounds, and alloys has been found which is valid in the energy region from 0.01 to 1000 MeV. Values of the total stopping power obtained by the present approach are in good agreement with the theoretical values recently reported by Berger and Seltzer [National Bureau of Standards Internal Report No. 82-2550-A (1982)] within a 5% discrepancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337623
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  • 4
    Electronic Resource
    Electronic Resource
    Hysteresis measurements on ferroelectric composites (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6317-6321 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ceramic/polymer composites made of calcium-modified lead titanate grains in the matrix of a copolymer of vinylidene fluoride and trifluorethylene, in a 65:35 volume fraction percentage, respectively, were produced in order to obtain mechanically strong ferroelectric films with improved piezo- and pyroelectric properties. Their poling behavior was studied using a modified ferroelectric hysteresis measurement setup that allowed for the measurement of the remanent polarization Pr and coercive field Ec, as a function of the peak of the sinusoidal applied field, the frequency of the excitation, and the poling temperature. The ranges of variation of the electric field, frequency, and temperature were from 5 to 25 MV/m, from 0.04 to 2 Hz, and from 50 to 120 °C, respectively. Estimates of the activation field and saturation polarization were calculated based on these measurements. The observed properties in the ferroelectric composites were then compared and correlated with the properties of the ceramic material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355153
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  • 5
    Electronic Resource
    Electronic Resource
    Polarization reversal and thermally stimulated discharge current in a vinylidene fluoride trifluoroethylene copolymer (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5691-5693 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polarization reversal in a ferroelectric copolymer of vinylidene fluoride and trifluoroethylene is observed in a circuit with a large time constant. The contributions of the ferroelectric and nonferroelectric phases in the copolymer can be identified in the reversal currents. If the copolymer is poled at high temperature, then reversal currents measured subsequently at lower temperatures display an asymmetry which is consistent with the accumulation of space charge in the copolymer. Shifts in successive reversal currents indicate that this space-charge accumulation dissipates slowly during polarization reversal. Thermally stimulated discharge currents from poled samples, and from samples with partially reversed polarization, indicate that there may be two populations of dipoles in the copolymer which are affected to different degrees by the space charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350187
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  • 6
    Electronic Resource
    Electronic Resource
    Extrapolated and projected ranges of electrons in metals (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 986-989 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The extrapolated range Rex and the projected range Rpr of electrons in metal absorbers have been calculated using the Wilson expression for mean range of high-energy electrons. The results are in good agreement with experimental values reported by Tabata, Ito, and Okabe [J. Appl. Phys. 42, 3361 (1971)]. Schematic comparison of the calculated values with experimental data is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336582
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  • 7
    Electronic Resource
    Electronic Resource
    DEVELOPMENT AND STORAGE STABILITY OF INTERMEDIATE MOISTURE CARROT (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), 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
    Notes: Intermediate moisture carrot slices were prepared by soaking the blanched slices for 12–16 hr in 6% brine followed by partial hot air dehydration to 50% moisture. Sucrose and glycerol at 10% and 5% levels respectively in the soak solution improved their texture on rehydration significantly. The concentrations of additives used were sufficient to ensure microbiological stability at the IM level but reached tolerable levels to taste on rehydration. Coating of the slices with BHA combined with mild compression yielded a shelf life of more than 6 months at room temperature and 37°C as judged by carotene loss and off-flavor development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb07438.x
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  • 8
    Electronic Resource
    Electronic Resource
    Involvement of Phosphodiesterase I in Mineralization: Histochemical Studies Using Antler from Red Deer (Cervus elaphus) as a Model (1999)
    Springer
    Calcified tissue international 65 (1999), S. 384-389 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Antler — Alkaline phosphatase — Phosphodiesterase I.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The growing antler of 1-year-old red deer is an excellent system in which to study processes involved in ``cartilage model'' endochondral-type bone growth. Antlers grow from the tip, permitting the developmental sequences of bone formation to be studied as distance-dependent phenomena, in which early processes can be observed at the distal end, and later events are sequentially more proximal. Quantitative light microscope histochemical assays for alkaline phosphatase (ALP) and phosphodiesterase I (PDE I) were used to determine the activities of these two phosphohydrolases in relation to antler mineralization and remodeling. Both enzymes were absent in proliferating young cartilage near the end, but progressively increased in activity in a proximal direction. ALP levels were maximal when mineralization was just beginning, whereas PDE I activity was greatest more proximally, where mineralization was more complete. This study provides strong indirect evidence that each of these enzymes has a function in mineralization, but that their roles are not identical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900718
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric and pyroelectric properties of polymer/ceramic composites (1988)
    Springer
    Journal of materials science 7 (1988), S. 167-170 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730608
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  • 10
    Electronic Resource
    Electronic Resource
    Scientometric study of biochemical literature of Nigeria, 1970–1984: Application of Lotka's law and the 80/20-Rule (1989)
    Springer
    Scientometrics 15 (1989), S. 171-179 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract A bibliography of biochemical literature of Nigeria for the period, 1970–1984 containing a total of 500 items, was analysed to test the applicability of Lotka's law and 80/20-rule to the author productivity distribution patterns. Four different files were created out of the data on author productivity: one for the publication of all the authors, second for the publications by first authors only, third for single authors and fourth for the contributions of only coauthors. Lotka's law could apply in all the four cases with different values of α. The Kolmogorov-Smirnov test was applied to test the applicability of Lotka's law at 0.01 level of significance. Egghe's theory and formula were used to test 80/20-rule and it was found that the rule did not apply to any of the four data sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02017196
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