Ultrasound and Wood Science at the Forestry Research Centre in Nancy, France, for a period of twenty years, between 1979 and 1999

Topical Issue - Development of European Acoustics in 20th Century

Open Access

Table 31.

Analysis of variance to study the effect of tree and of increment core position in tree along the L or T axes. Parameters used: ultrasonic velocities of various frequencies. Specimens: increment cores of 5 mm diameter of beech (Fagus Sylvatica) [4].

Variation source	Wave	Frequency	Test F for the following characteristics
Variation source	Wave	Frequency	V_LL	V_RR	V_TT	V_LR	V_LT	V_TR
Tree
	P wave	80 kHz	NS	**	NS
		2 MHz	**	**	**
	S wave	1 MHz				*	NS	*
Position in tree
	P wave	80 kHz	NS	**	*
		2 MHz	**	NS	**
	S wave	! MHz				NS	*	**
Interaction
	P wave	80 kHz	NS	NS	NS
		2 MHz
	S wave	1 MHz				NS	**	NS

Notes. NS – not significant. Symbols: ** significant at 1% significant at 5%.

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