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Forced thickness-extensional trapped energy vibrations of polarized ceramic plates (1990)

Shick, D. V. ; Tiersten, H. F. ; Sinha, B. K.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 68 (1990), S. 4998-5008

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: An analysis of PZT-7A plates driven into thickness-extensional trapped energy vibrations by the application of a voltage to strip electrodes is performed. The plate waves in the unelectroded region that carry energy away from the trapped mode are included in the treatment. The solution consists of a sum of the driven thickness solution and the pertinent plate eigensolutions for shorted electrodes in the electroded region and for zero surface charge in the unelectroded region. Since the sum of the solutions in each region satisfies the differential equations and boundary conditions on the major surfaces exactly, the substitution into the appropriate variational principle of linear piezoelectricity yields integral conditions across the thickness of the plate at the edge of the electrodes. The resulting system of inhomogeneous linear algebraic equations yields the response from very low frequency to slightly above the first thickness-extensional frequency of the unelectroded plate.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.347087

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The Role of Peroxidase and Polyphenol Oxidase Isozymes in Wheat Resistance to Alternaria triticina (2000)

Tyagi, M. ; Kayastha, Arvind M. ; Sinha, B.

Springer

Biologia plantarum 43 (2000), S. 559-562

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ISSN: 1573-8264

Keywords: phenolics ; susceptibility ; Triticum aestivum

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Polyphenol oxidase activity was higher in resistant wheat cultivar ACC-8226 than in susceptible cultivar MP-845 in control sets and after inoculation of Alternaria triticina. However, similar polyphenol oxidase isozyme pattern was found in control and inoculated sets of both the cultivars, but the band intensity was higher after inoculation. Three and four peroxidase isozymes were found in ACC-8226 and MP-845, respectively. An extra peroxidase isozyme band was observed in both the cultivars after inoculation. The results suggest an active role of peroxidase and polyphenol oxidase in defence mechanism of wheat plants.