By C. R. Metcalfe, L. Chalk
This revised variation of quantity II of the Anatomy of the Dicotyledons completes the final advent to plant anatomy supplied by means of this verified botanical reference paintings. as well as a finished dialogue of wooden constitution and different subject matters (see desk of contents), quantity II incorporates a revised model of Takhtajan's taxonomic approach for the Dicotyledons, in an effort to be used because the foundation for relations descriptions in destiny volumes.
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Extra info for Anatomy of the Dicotyledons: Volume II: Wood Structure and Conclusion of the General Introduction
R1, R2, R3,…represent resonances and correspond to the natural frequencies of an element that is clamped at the bottom and free at the top. The maxima A1, A2, A3,… represent anti-resonances and correspond to the natural frequencies of an element that is clamped and simply supported at the top. It can be seen that the differences of resonance and anti-resonance extrema are a function of the damping factor δ. Fig. 13. Theoretical curves of mechanical impedance function |Z*| versus frequency parameter nl.
17. The sine-wave signal from an automatic generator leads to the power amplifier and electrodynamic vibrator. The vibration is transferred through the impedance head into the test specimen. The impedance head gives the possibility of measuring the amplitude of the force by using a preamplifier and voltmeter and recording the variation in the force amplitude with frequency. Fig. 17. Block diagram of experimental arrangement for mechanical impedance method. The signal from the accelerometer leads through the preamplifier to the control generator and serves to regulate the specimen vibration in such a way that the amplitude of acceleration at the exciting point of the specimen is constant during the measuring process.
Isotherms for precoated sand and gravel. of the bituminous materials tested is only approximately thermorheologically linear. From the practical point of view it is advantageous to assume that this criterion is valid for the complex modulus of elasticity. The damping factor δ is more or less constant for every temperature and is independent of frequency. The principle of superposition of time and temperature cannot be used for the damping factor. e. the functions of the relationships of the complex modulus of elasticity versus frequency obtained by measuring at various temperatures, give these relations in a certain limited frequency range.
Anatomy of the Dicotyledons: Volume II: Wood Structure and Conclusion of the General Introduction by C. R. Metcalfe, L. Chalk