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Shakti Chauhan – One of the best experts on this subject based on the ideXlab platform.

  • Assessment of variability in morphological and wood quality traits in Melia dubia Cav. for selection of superior trees
    Journal of the Indian Academy of Wood Science, 2014
    Co-Authors: Shakti Chauhan, A. N. Arun Kumar
    Abstract:

    Assessment of natural variability in morphological and important wood quality traits and selection of trees with superior or desired wood characteristics is a prerequisite for an effective tree improvement. Variability in morphological and wood quality traits was assessed in selected trees from a 9-year-old plantation of Melia dubia raised from material of unknown genetic source. A large variation was observed in vertical and lateral tree growth within the sampled trees. Wood quality traits namely heartwood proportion, basic density, stress wave Velocity, dynamic modulus of elasticity (DMoE) and volumetric shrinkage also exhibited a substantial variation between trees. Pilodyn penetration exhibited a strong negative correlation with wood basic density and DMoE. Acoustic Velocity in trees, wood basic density, and volumetric shrinkage did not exhibit any significant relationship with each other. Similarly, tree growth parameters were not related to either wood density or shrinkage. Acoustic Velocity measured in standing trees by transit-time method was in a close agreement with the Velocity measured in logs using resonance method. A large variability in the measured traits and absence of any significant relationship in morphological and wood quality traits imply that selection of trees with superior wood properties can be made for further propagation without compromising on tree growth. Pilodyn and Acoustic Velocity measurements in standing trees provided an opportunity to screen and select M . dubia trees with superior wood density and modulus of elasticity.

  • wood quality in artificially inclined 1 year old trees of eucalyptus regnans differences in tension wood and opposite wood properties
    Canadian Journal of Forest Research, 2011
    Co-Authors: Shakti Chauhan, John C. F. Walker
    Abstract:

    This paper presents a new approach to assess wood quality in 1-year-old Eucalyptus regnans F. Muell. Twenty-two seedlings were grown tilted to induce tension wood and Acoustic Velocity, basic density, longitudinal shrinkage, and volumetric shrinkage of both opposite wood and tension wood were assessed subsequently. Longitudinal growth strains were also estimated in the leaning stems by sawing along the length through the pith and measuring the bending of the two halves. The derived longitudinal growth strain, which varied from 708 to 2319 µe, was uncorrelated with stem and wood characteristics. Wood characteristics differed significantly between upper-side wood (predominantly tension wood) and lower-side wood (opposite wood). Tension wood was characterized by a higher Acoustic Velocity (high stiffness), basic density, and volumetric shrinkage compared with opposite wood. Tension wood also exhibited significant collapse and dimensional distortion such as twisting. Longitudinal shrinkage exhibited a signifi…

  • wood quality in artificially inclined 1 year old trees of eucalyptus regnans differences in tension wood and opposite wood properties
    Canadian Journal of Forest Research, 2011
    Co-Authors: Shakti Chauhan, J C F Walker
    Abstract:

    This paper presents a new approach to assess wood quality in 1-year-old Eucalyptus regnans F. Muell. Twenty-two seedlings were grown tilted to induce tension wood and Acoustic Velocity, basic densi…

John C. F. Walker – One of the best experts on this subject based on the ideXlab platform.

  • wood quality in artificially inclined 1 year old trees of eucalyptus regnans differences in tension wood and opposite wood properties
    Canadian Journal of Forest Research, 2011
    Co-Authors: Shakti Chauhan, John C. F. Walker
    Abstract:

    This paper presents a new approach to assess wood quality in 1-year-old Eucalyptus regnans F. Muell. Twenty-two seedlings were grown tilted to induce tension wood and Acoustic Velocity, basic density, longitudinal shrinkage, and volumetric shrinkage of both opposite wood and tension wood were assessed subsequently. Longitudinal growth strains were also estimated in the leaning stems by sawing along the length through the pith and measuring the bending of the two halves. The derived longitudinal growth strain, which varied from 708 to 2319 µe, was uncorrelated with stem and wood characteristics. Wood characteristics differed significantly between upper-side wood (predominantly tension wood) and lower-side wood (opposite wood). Tension wood was characterized by a higher Acoustic Velocity (high stiffness), basic density, and volumetric shrinkage compared with opposite wood. Tension wood also exhibited significant collapse and dimensional distortion such as twisting. Longitudinal shrinkage exhibited a signifi…

  • Wood quality in artificially inclined 1-year-old trees of Eucalyptus regnans — differences in tension wood and opposite wood properties
    Canadian Journal of Forest Research, 2011
    Co-Authors: Shakti Chauhan, John C. F. Walker
    Abstract:

    This paper presents a new approach to assess wood quality in 1-year-old Eucalyptus regnans F. Muell. Twenty-two seedlings were grown tilted to induce tension wood and Acoustic Velocity, basic density, longitudinal shrinkage, and volumetric shrinkage of both opposite wood and tension wood were assessed subsequently. Longitudinal growth strains were also estimated in the leaning stems by sawing along the length through the pith and measuring the bending of the two halves. The derived longitudinal growth strain, which varied from 708 to 2319 µe, was uncorrelated with stem and wood characteristics. Wood characteristics differed significantly between upper-side wood (predominantly tension wood) and lower-side wood (opposite wood). Tension wood was characterized by a higher Acoustic Velocity (high stiffness), basic density, and volumetric shrinkage compared with opposite wood. Tension wood also exhibited significant collapse and dimensional distortion such as twisting. Longitudinal shrinkage exhibited a signifi…

  • variations in Acoustic Velocity and density with age and their interrelationships in radiata pine
    Forest Ecology and Management, 2006
    Co-Authors: Shakti Chauhan, John C. F. Walker
    Abstract:

    Abstract Acoustic Velocity by the Fakopp time of flight (ToF) tool was used to estimate outerwood stiffness of trees within stands and between stands of different age classes (ages 8, 16 and 25). The TOF Acoustic Velocity measured in the standing trees was generally higher than the Acoustic Velocity measured by the Hitman (resonance) tool on the associated logs. The difference between the two velocities tended to be greater in the older and large diameter trees. The large variability in Acoustic Velocity, or preferably V 2 , makes it an efficient wood quality variable for screening trees. Wood density variables did not exhibit any relationship with Acoustic Velocity or modulus of elasticity (MoE) within each age-class. The classic pseudo-relationship observed with pooled data from all stand ages is mainly due to a stand age-effect and so one should be cautious in relying on any significant association between density and MoE.

Jianxin Wei – One of the best experts on this subject based on the ideXlab platform.

  • experimental study of water saturation effect on Acoustic Velocity of sandstones
    Journal of Natural Gas Science and Engineering, 2016
    Co-Authors: Jianxin Wei
    Abstract:

    Abstract This study investigated the effect of water saturation on P-wave and S-wave Velocity of gas–water saturated sandstones under atmospheric and high confining pressure. The measured samples were artificial sandstones of the same composition and shale-free. Different porosity was the dominating parameter that influenced the elastic property. Measured results were compared with Gassmann fluid substitution combined with three different mixed fluids effective bulk modulus models. The results demonstrated that with the decrease of porosity and permeability the gas–water mixed fluids were more likely to be inhomogeneous in the pores of sandstone. P-wave Velocity trend was gradually close to the Gassmann–Hill boundary and away from Gassmann–Wood boundary, and the Gassmann–Brie model with an adjustable e -coefficient was more practical to estimate P-wave Velocity of sandstone. S-wave Velocity decreased linearly with the increase of water saturation. With the increase of confining pressure, the overall change in Velocity induced by saturation was gradually reduced, and rock compacting may cause the Velocity–saturation trend become close to the low porosity case.