scholarly journals The Bulk Elastic Modulus and the Reversible Properties of Cell Walls in Developing Quercus Leaves

2006 ◽  
Vol 47 (6) ◽  
pp. 715-725 ◽  
Author(s):  
Takami Saito ◽  
Kouichi Soga ◽  
Takayuki Hoson ◽  
Ichiro Terashima
Keyword(s):  
Elastic Modulus ◽  
Cell Walls ◽  
Bulk Elastic Modulus

scholarly journals Comparative analysis of the dependence of the bulk elastic modulus of the liquid on pressure and gas factor

2019 ◽  
Vol 1399 ◽  
pp. 055083 ◽  
Author(s):  
A S Lunev ◽  
A A Nikitin ◽  
Y F Kaizer ◽  
A V Lysyannikov ◽  
D A Sokolov ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Comparative Analysis ◽  
Bulk Elastic Modulus

Influence of Pressure of Electron Gas on Elastic Property of Metal

2012 ◽  
Vol 602-604 ◽  
pp. 857-860
Author(s):  
Li Jun He
Keyword(s):  
Elastic Modulus ◽  
Potential Energy ◽  
Electron Gas ◽  
Current Method ◽  
Ideal Gas ◽  
Conduction Electrons ◽  
Valence Electrons ◽  
Dirac Distribution ◽  
Atom Potential ◽  
Bulk Elastic Modulus

A balloon filled with electron gas model was built to simulate metal for calculating its bulk elastic. Electron gas obeyed Fermi-Dirac distribution and satisfied with theory of ideal gas. Expression of metal bulk elastic modulus was derived, and the comparison between the new method given in this paper with current method according to theory of atom potential energy on calculation accuracy was also given. It showed that, pressure of electron gas closely related to bulk elastic modulus, and maybe it was the major factor in determining bulk elastic modulus of metal; not all of valence electrons of atom in metal became conduction electrons to form the electron gas; new model of present work is superior to traditional method based on calculating derivative of potential energy.

scholarly journals Water Relation Parameters of the Cortex Tissue of Fresh ‘Fuji’ Apple Fruit Determined by Centrifugation

HortScience ◽  
2011 ◽  
Vol 46 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Xue-Min Hou ◽  
Zi-Hua Wang ◽  
Xi-Min Deng ◽  
Guo-Hui Li
Keyword(s):  
Elastic Modulus ◽  
Osmotic Potential ◽  
Water Relation ◽  
Apple Fruit ◽  
Pressure Potential ◽  
Centrifuge Method ◽  
Turgor Loss Point ◽  
Relative Water ◽  
Fuji Apple ◽  
Bulk Elastic Modulus

This experiment was carried out to obtain a pressure–volume (P-V) curve and Höfler diagram of the cortex tissue of fresh ‘Fuji’ apple fruit (Malus ×domestica Borkh.) with a novel centrifuge method. Based on the P-V curve and Höfler diagram, several water relation parameters of cortex tissue were determined and the interrelationship of these parameters was established. Turgor loss point (TLP) occurred at –1.74 MPa and 73.7% of relative water content (R*). At full hydration, osmotic potential (ψS) was –1.30 MPa and symplastic water accounted for 86.8% of R*. Bulk elastic modulus decreased linearly by 28% as pressure potential declined from 1.30 MPa at full hydration to zero at the TLP. This centrifuge technique can provide a simple and efficient way to determine water relation parameters of fleshy fruits.

Quasi-static and dynamic nanoindentation to determine the influence of thermal treatment on the mechanical properties of bamboo cell walls

Holzforschung ◽  
2015 ◽  
Vol 69 (7) ◽  
pp. 909-914 ◽  
Author(s):  
Yanjun Li ◽  
Liping Yin ◽  
Chengjian Huang ◽  
Yujie Meng ◽  
Feng Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Thermal Treatment ◽  
Cell Walls ◽  
Loss Modulus ◽  
Treatment Temperature ◽  
Dry Density ◽  
Bamboo Fibers ◽  
Tan Δ ◽  
Dynamic Nanoindentation

Abstract Bamboo was thermally treated at 180°C and 200°C, and the micromechanical properties of its cell walls were investigated by means of quasi-static and dynamic nanoindentation experiments. With increasing treatment temperatures, the average dry density and mass of the bamboo decreased, whereas the already reduced elastic modulus at 180°C of the fiber cell walls did not change, but the hardness showed increasing tendencies. Dynamic nanoindentation revealed reduced storage modulus $({E'_{\rm{r}}})$ and loss modulus $({E''_{\rm{r}}}\,)$ for the thermotreated bamboo cell walls compared with the untreated bamboo fibers in all frequency regions. Moreover, ${E'_{\rm{r}}},{\rm{ }}{E''_{\rm{r}}},$ and loss tangent (tan δ) of treated bamboo decreased with increasing treatment temperature.

scholarly journals Change in Micromechanical Behavior of Surface Densified Wood Cell Walls in Response to Superheated Steam Treatment

Forests ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 693
Author(s):  
Elin Xiang ◽  
Rongfeng Huang ◽  
Shumin Yang
Keyword(s):  
Elastic Modulus ◽  
Creep Resistance ◽  
Cell Walls ◽  
Superheated Steam ◽  
Untreated Wood ◽  
Fiber Cell ◽  
Steam Treatment ◽  
Densified Wood ◽  
Relative Crystallinity ◽  
Fiber Cell Wall

The combination of surface densification and superheated steam treatment is an effective method to improve the mechanical properties and dimensional stability of low-density wood. The objective of the current work is to evaluate the effects of superheated steam treatment on the micromechanical behavior of surface densified wood. The microstructure, chemical composition, cellulose crystalline structure, and micromechanical behavior of surface densified wood under different superheated steam pressures were investigated. Results indicated that both 0.1 MPa and 0.3 MPa superheated steam treatments increased the elastic modulus and hardness of fiber cell walls in surface densified wood. However, the average creep ratio and maximum creep compliance J(50) of surface densified wood under 0.3 MPa decreased by 41.59% and 6.76%, respectively, compared with untreated wood. The improvement of elastic modulus, hardness and creep resistance of surface densified wood treated with superheated steam was associated with the increase of relative crystallinity (CrI) and crystalline size. In addition, 0.3 MPa superheated steam treatment displayed a better effect on the enhancement of the elastic modulus, hardness, and creep resistance of the fiber cell wall than 0.1 MPa superheated steam treatment.

scholarly journals Determination of the Effects of Superheated Steam on Microstructure and Micromechanical Properties of Bamboo Cell Walls Using Quasi-Static Nanoindentation

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1742
Author(s):  
Tiancheng Yuan ◽  
Xiaorong Liu ◽  
Youming Dong ◽  
Xinzhou Wang ◽  
Yanjun Li
Keyword(s):  
Elastic Modulus ◽  
Cell Walls ◽  
Superheated Steam ◽  
Lignin Content ◽  
Crystallinity Index ◽  
X Ray Diffraction ◽  
Untreated Sample ◽  
X Ray ◽  
Micromechanical Properties

In this paper, quasi-static nanoindentation was applied for investigating the influence of superheated steam on microstructure and micromechanical properties of Moso bamboo cell walls. The changes of mico-morphology, chemical composition, cellulose crystallinity index, micro-mechanical properties of bamboo were analyzed via scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and nanoindentation. As expected, the content of hemicellulose and cellulose showed a downward trend, whereas the relative lignin content increased. Elastic modulus and hardness of the cell wall increased compared with that of the untreated sample. The elastic modulus and hardness of bamboo increased from 11.5 GPa to 19.5 GPa and from 0.35 GPa to 0.59 GPa. Furthermore, results showed that the creep resistance positively correlated to treatment severity.

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