Zobrazeno 1 - 10
of 19
pro vyhledávání: '"mostafa kohantorabi"'
Publikováno v:
Drvna Industrija, Vol 73, Iss 4, Pp 431-438 (2022)
The determination of the shear dynamic modulus in wood product panels is of greater importance than its determination in wood beams. Yet with regards to the effect of defects on the obtained values of shear modulus, this factor is used to detect the
Externí odkaz:
https://doaj.org/article/c18b16a7e42b4c44844ee3c7a6fa06a4
Autor:
Mehran Roohnia, Ahmad Jahanlatibari, Behzad Behnam, Jamshid Zarrinmehr, Mostafa Kohantorabi, Negin Manouchehri, Ajang Tajdini
Publikováno v:
تحقیقات علوم چوب و کاغذ ایران, Vol 33, Iss 1, Pp 100-111 (2018)
Reaching to the technology of acoustical Tomography and imaging, this project was ordered for facilitating the work for green space researchers and managers in urban standing trees. Comparing the sensors and micro-second timers with those of a certif
Externí odkaz:
https://doaj.org/article/1cb1db77c9754b5ab95d604a291f5ed5
Publikováno v:
تحقیقات علوم چوب و کاغذ ایران, Vol 32, Iss 2, Pp 193-204 (2017)
In this study the relationship between dynamic modulus of elasticity from longitudinal vibration method with static modulus of elasticity and bending strength in two directions: the Parallel machine direction and machine direction have be
Externí odkaz:
https://doaj.org/article/c6ef485a0cc34f3ba3a7f3036f7e5169
Publikováno v:
تحقیقات علوم چوب و کاغذ ایران, Vol 32, Iss 1, Pp 13-24 (2017)
In this study, 10 samples of beech wood, without apparent defect, with dimensions of 360 × 16 × 16 cm (length × radial × tangential) were selected, and after being exposed to variable temperature (60, 80, 100, 120, 140, 160, and
Externí odkaz:
https://doaj.org/article/09b8c880fb6f41bf8c174ac71c198700
Autor:
Mehran Roohnia, Mostafa Kohantorabi
Publikováno v:
BioResources, Vol 10, Iss 3, Pp 4867-4876 (2015)
There are different dynamic or static test methodologies for evaluating the shear and torsional moduli of wood. A preferred method is nondestructive, accurate, and standard. However, dynamic methods using conventional devices previously suggested for
Externí odkaz:
https://doaj.org/article/b1c046d7f8a14154bce69538a2819e11
Publikováno v:
تحقیقات علوم چوب و کاغذ ایران, Vol 29, Iss 4, Pp 633-643 (2014)
In this study effect of different NDT methods on dynamic properties in beech wood (flexural vibration and longitudinal vibration method) were evaluated .29 clear samples with nominal dimension of 2×4×36 cm selected and bending vibration in free-fre
Externí odkaz:
https://doaj.org/article/7380ef5774744198b42d8506a8055296
Autor:
Mostafa Kohantorabi, Mehran Rohnia
Publikováno v:
تحقیقات علوم چوب و کاغذ ایران, Vol 28, Iss 2, Pp 238-257 (2013)
In this study, detect of damage in scarf joint and finger joint using the variations in dynamic shear modulus values and Correlation Coefficient factor of the beech wood specimens was investigated. Numbers of 42 Samples were selected according to ISO
Externí odkaz:
https://doaj.org/article/9b0a8f429b87472cac61f1cf5904905e
Publikováno v:
BioResources. 15:4711-4726
Inhomogeneities in wood and wood products are evident. Sometimes these inhomogeneities are combined with other inhomogeneities such as drilling. Each can have different effects on dynamic properties, and these footprints can cause hidden defects in w
Autor:
Mostafa Kohantorabi, Mehran Roohnia
Publikováno v:
BioResources, Vol 10, Iss 3, Pp 4867-4876 (2015)
There are different dynamic or static test methodologies for evaluating the shear and torsional moduli of wood. A preferred method is nondestructive, accurate, and standard. However, dynamic methods using conventional devices previously suggested for
Publikováno v:
Drvna industrija. 66:221-228
The capability of application of fl exural vibration test in nondestructive evaluation of wood drying was studied. Poplar timbers were conventionally kiln dried under three different drying schedules down to the fi nal moisture content of 12 ±2 %. D