Determination of equilibrium moisture content of yellow-poplar sapwood above 100�C with the aid of an experimental psychrometer

1981 ◽  
Vol 15 (2) ◽  
pp. 93-103 ◽  
Author(s):  
A. C. Kent ◽  
H. N. Rosen ◽  
B. M. Hari
Keyword(s):  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Yellow Poplar

scholarly journals Determination of elastic parameters of grain with oedometric and acoustic methods

2012 ◽  
Vol 49 (No. 2) ◽  
pp. 56-60 ◽  
Author(s):  
M. Stasiak
Keyword(s):  
Hydrostatic Pressure ◽  
Moisture Content ◽  
Shear Wave ◽  
Equilibrium Moisture Content ◽  
Shear Wave Velocity ◽  
Modulus Of Elasticity ◽  
Uniaxial Compression Test ◽  
Elastic Parameters ◽  
Acoustic Methods

Values of modulus of elasticity E and Poisson’s ratio   were determined with two methods adopted from geotechnique. First approach used was a method proposed by Sawicki (1994). This type of examination was applied to estimate values of E and v for wheat and rapeseed beddings for five levels of moisture content ranging from 6% to 20%. Modulus of elasticity E of wheat was found to decrease with an increase in moisture content. With the second method values of E were determined based on measurement of shear wave velocity. Tests were performed for bedding of wheat and rapeseed under equilibrium moisture content. Values of modulus of elasticity were found to depend of hydrostatic pressure and were higher then those determined in uniaxial compression test.

scholarly journals Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore

2016 ◽  
Vol 20 (5) ◽  
pp. 493-498 ◽  
Author(s):  
Kelly A. de Sousa ◽  
Osvaldo Resende ◽  
Bruno de S. Carvalho
Keyword(s):  
Moisture Content ◽  
Latent Heat ◽  
Equilibrium Moisture Content ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Static Method ◽  
The One ◽  
Content Range ◽  
Water Sorption Isotherms

ABSTRACT The objective was to determine water sorption isotherms of diaspores of pequi fruits in order to obtain information on the amount of water that this product desorbs at the temperatures of 10, 20, 30 and 40 °C and water activities from 0.20 to 0.89, adjusting different mathematical models to experimental data, and to determine its latent heat and isosteric heat. The equilibrium moisture content was obtained through the indirect static method, using the device Hygropalm Model Aw 1. The Modified Henderson model was the one that best fitted the data and was selected to predict the equilibrium moisture content of pequi diaspore. It was observed that the higher the temperature for the same equilibrium moisture content (% d.b.), the higher the water activity values. As temperature values increased, there was a reduction in the vaporization latent heat of the product. Isosteric heat values of diaspores of pequi fruits in the moisture content range of 4.02 to 16.63 (% d.b.) varied from 2,776.49 to 2,558.39 kJ kg-1.

scholarly journals Performance of an Accelerated Method for the Determination of Equilibrium Moisture Content

2006 ◽  
Vol 12 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Md. Ashraful HAQUE ◽  
M.K.K. SUDEEPA ◽  
Naoto SHIMIZU ◽  
Toshinori KIMURA
Keyword(s):  
Moisture Content ◽  
Equilibrium Moisture Content

scholarly journals Determination of Equilibrium Moisture Content in Trade Distribution

2020 ◽  
Vol 1 (1) ◽  
pp. 25-29
Author(s):  
David S S Marpaung ◽  
Anggia Indryani ◽  
Ayu Oshin Yap Sinaga
Keyword(s):  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Trade Distribution

scholarly journals Variability in the mechanical properties of commercially available thermally modified hardwood lumber

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6083-6099
Author(s):  
Juan J. Gonzalez ◽  
Brian Bond ◽  
Henry Quesada
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Equilibrium Moisture Content ◽  
Untreated Wood ◽  
Red Maple ◽  
Yellow Poplar ◽  
Bending Modulus ◽  
Tangential Shrinkage ◽  
Improved Performance ◽  
Mechanical Performances

Research indicates that users of thermally modified wood lack information regarding the improved performance and any variations that may exist for the “same” product when manufactured by different companies. The goal of this study was to evaluate the variability in mechanical properties of three thermally modified hardwoods and determine the variability between three different manufacturers. To determine the hardness, bending (modulus of elasticity and module of rupture) and shrinkage values, testing was conducted following ASTM standard D143. The samples were conditioned at 20 °C and a relative humidity of 65% until they reached an equilibrium moisture content before testing. Analysis of variance was used to determine the variability within and between the different processes used by each company. Seven out of 18 (39%) tests indicated that there were statistical differences regarding the mechanical performances of the wood samples. Yellow poplar had the least variation between companies (only difference in equilibrium moisture content, EMC) and red maple had the most (hardness, tangential shrinkage, and EMC). While the means for these properties were statistically different, the differences in application for hardness and EMC are slight. For example, the largest difference between processes in hardness was 83.6 kg, for tangential shrinkage, 0.45% and 1.37% for EMC. These differences are suggested to be inconsequential when compared to the values that exist between different species of untreated wood.

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