19 results
Number of results to display per page
Search Results
2. Experimental simulation and mathematical modelling of clogging in stone column.
- Author
-
Tai, Pei, Indraratna, Buddhima, and Rujikiatkamjorn, Cholachat
- Subjects
COLUMNS ,UNIT cell ,CLAY ,SOILS ,COMPUTED tomography ,STRAINS & stresses (Mechanics) - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2018
- Full Text
- View/download PDF
3. Knot detection in computed tomography images of partially dried jack pine ( Pinus banksiana) and white spruce ( Picea glauca) logs from a Nelder type plantation.
- Author
-
Fredriksson, Magnus, Cool, Julie, Duchesne, Isabelle, and Belley, Denis
- Subjects
COMPUTED tomography ,JACK pine ,WHITE spruce ,SAPWOOD ,SAWMILLS ,LOGGING - Abstract
Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
- View/download PDF
4. Visualization of diffusion phenomena in porous media by means of X-ray computed tomography (CT) scanning.
- Author
-
Akira Sato and Koichi Ikeda
- Subjects
VISUALIZATION ,RADIOGRAPHY ,X-rays ,COMPUTED tomography ,POROUS materials - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2015
- Full Text
- View/download PDF
5. Clear wood content in standing trees predicted from branch scar measurements with terrestrial LiDAR and verified with X-ray computed tomography1.
- Author
-
Stängle, Stefan M., Brüchert, Franka, Kretschmer, Ursula, Spiecker, Heinrich, and Sauter, Udo H.
- Subjects
WOOD density ,COMPUTED tomography ,DIFFERENTIAL absorption lidar ,WOOD quality ,EUROPEAN beech ,AFFORESTATION - Abstract
Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
- View/download PDF
6. Embryo position of Castanopsis sclerophylla (Fagaceae) seeds with recalcitrant storage behavior differs from Quercus genus but response to desiccation shows no difference.
- Author
-
Li, Jiajin, Jaganathan, Ganesh K., Han, Kang, and Liu, Baolin
- Subjects
SEED storage ,GERMINATION ,FAGACEAE ,COMPUTED tomography ,EMBRYOS ,OAK - Abstract
Copyright of Botany is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
- View/download PDF
7. Clear wood content in standing trees predicted from branch scar measurements with terrestrial LiDAR and verified with X-ray computed tomography1.
- Author
-
Stängle, Stefan M., Brüchert, Franka, Kretschmer, Ursula, Spiecker, Heinrich, and Sauter, Udo H.
- Subjects
- *
COMPUTED tomography , *DIFFERENTIAL absorption lidar , *WOOD quality , *EUROPEAN beech , *AFFORESTATION ,WOOD density - Abstract
Knowledge about the wood quality of standing trees is crucial in that it serves as an excellent means for nearly all stages of the wood-supply chain. Better information about internal wood characteristics can be derived from the outside appearance by establishing a correlation between the bark characteristics of a stem and its internal quality. This paper presents an approach where the quality determination of standing trees using a terrestrial light detection and ranging (LiDAR) system is combined with the information about internal quality of logs using X-ray computed tomography (CT). Results show a high accuracy for branch scar measurements with terrestrial LiDAR and knot measurement with CT. A strong correlation between scar seal quotient and the amount of clear wood could be confirmed using European beech ( Fagus sylvatica L.) as an example. Quality grading of virtually segmented logs using terrestrial LiDAR and CT showed moderate correlation; 62.5% of the segments were allocated to the same grade by both approaches. In conclusion, terrestrial LiDAR in forest inventory could be used as an instrument to predict inner wood quality in greater detail by gathering data on the outer appearance and branch scars of standing trees. This additional knowledge has the potential to improve forest planning, bucking instructions, and a roundwood allocation that meets industry demand. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
8. An ornithurine bird coracoid from the Late Cretaceous of Alberta, Canada.
- Author
-
Mohr, Sydney R., Acorn, John H., Funston, Gregory F., and Currie, Philip J.
- Subjects
COMPUTED tomography ,BIRDS - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2021
- Full Text
- View/download PDF
9. Impact of initial structural heterogeneity on long-term swelling behavior of MX80 bentonite pellet/powder mixtures.
- Author
-
Molinero Guerra, Agustín, Mokni, Nadia, Cui, Yu-Jun, Delage, Pierre, Tang, Anh Minh, Aimedieu, Patrick, Bernier, Frédéric, and Bornert, Michel
- Subjects
WOOD pellets ,POWDERS ,COMPUTED tomography ,MIXTURES ,PELLETIZING ,HUMIDITY ,HETEROGENEITY - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
10. Arachidonic acid status negatively associates with forearm bone outcomes and glucose homeostasis in children with an overweight condition or obesity.
- Author
-
Mak, Ivy L., Cohen, Tamara R., Vanstone, Catherine A., and Weiler, Hope A.
- Subjects
BLOOD sugar analysis ,INSULIN resistance risk factors ,ADIPOSE tissues ,ANALYSIS of variance ,ARACHIDONIC acid ,COMPUTED tomography ,FASTING ,FOREARM ,HOMEOSTASIS ,INSULIN ,CHILDHOOD obesity ,RACE ,RISK assessment ,BONE density ,BODY mass index ,PHOTON absorptiometry ,DISEASE complications - Abstract
Copyright of Applied Physiology, Nutrition & Metabolism is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
11. Applications of computed tomography (CT) scanning technology in forest research: a timely update and review.
- Author
-
Beaulieu, Jean and Dutilleul, Pierre
- Subjects
COMPUTED tomography ,WOOD quality ,MANUFACTURING processes ,FOREST products ,TECHNOLOGY ,IMAGE reconstruction algorithms - Abstract
Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
12. Computed tomography (CT) scanning of internal log attributes prior to sawing increases lumber value in white spruce (Picea glauca) and jack pine (Pinus banksiana)
- Author
-
Denis Belley, Steve Vallerand, Julie Barrette, Isabelle Duchesne, and Michel Beaudoin
- Subjects
%22">Pinus ,Global and Planetary Change ,Jack pine ,Ecology ,medicine.diagnostic_test ,medicine ,Environmental science ,Forestry ,Computed tomography - Abstract
The increased pressure on timber supply due to a reduced forest land base urges the development of new approaches to fully capture the value of forest products. This paper investigates the effects of knowing the position of knots on lumber volume, value, and grade recoveries in curve sawing of 31 white spruce (Picea glauca (Moench) Voss) and 22 jack pine (Pinus banksiana Lamb.) trees. Internal knot position was evidenced by X-ray computed tomography (CT) imaging, followed by the application of a knot-detection algorithm allowing log reconstruction for use as input in the Optitek sawing simulation software. Comparisons of the three levels of sawing optimization (sweep up, shape optimized, and knot optimized) revealed that considering internal knots before log sawing (e.g., knot optimized) generated 23% more lumber value for jack pine and 15% more for white spruce compared with the traditional sweep-up sawing strategy. In terms of lumber quality, the knot-optimized strategy produced 38% more pieces of grade No. 2 and better in jack pine and 15% more such pieces in white spruce compared with the sweep-up strategy. These results indicate a great potential to increase manufacturing efficiency and profitability by implementing the CT scanning technology, which should aid in developing a strong bioeconomy based on an optimized use of wood.
- Published
- 2019
13. Role of n-3 fatty acids in muscle loss and myosteatosis1.
- Author
-
Ewaschuk, Julia B., Almasud, Alaa, and Mazurak, Vera C.
- Subjects
BODY composition ,CACHEXIA ,OMEGA-3 fatty acids ,TOMOGRAPHY ,TUMORS ,DOCOSAHEXAENOIC acid ,EICOSAPENTAENOIC acid ,SKELETAL muscle - Abstract
Copyright of Applied Physiology, Nutrition & Metabolism is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
- View/download PDF
14. Observations on microstructure of pumice particles using computed tomography.
- Author
-
Kikkawa, Naotaka, Orense, Rolando P., and Pender, Michael J.
- Subjects
PUMICE ,COMPUTED tomography ,PARTICLE analysis ,DENSITY ,FLUID dynamic measurements ,POROSITY - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
- Full Text
- View/download PDF
15. Experimental simulation and mathematical modelling of clogging in stone column
- Author
-
Cholachat Rujikiatkamjorn, Pei Tai, and Buddhima Indraratna
- Subjects
Engineering ,medicine.diagnostic_test ,business.industry ,0208 environmental biotechnology ,0211 other engineering and technologies ,0905 Civil Engineering, 0907 Environmental Engineering ,Computed tomography ,02 engineering and technology ,Geological & Geomatics Engineering ,Geotechnical Engineering and Engineering Geology ,020801 environmental engineering ,Clogging ,Soft clay ,parasitic diseases ,medicine ,Model test ,Geotechnical engineering ,business ,021101 geological & geomatics engineering ,Civil and Structural Engineering - Abstract
In this paper, time-dependent clogging is studied considering a unit cell consisting of a single stone column interacting with the surrounding soft clay. Clogging is assessed quantitatively and the corresponding void space of the column is determined using computed tomography. It is observed that the extent of clogging is substantial in the upper part of the column, but diminishes rapidly with depth. The soil properties in the clogged zone are determined indirectly through additional tests of clay–aggregates mixtures with various clay fractions. An equal strain consolidation model based on the principle of unit cell analysis is developed to capture both the initial and time-dependent clogging. The model accounts for a reduction in permeability and an increase in compressibility of the column. This current model, as expected, offers identical results to some previous studies if clogging is ignored, while the comparison with other selected models demonstrates the influence that clogging of the stone column can have on the consolidation of the surrounding soil. Furthermore, load–settlement predictions from the proposed “equal strain” model are also compared with the consolidation response of a previously developed “free strain” model.
- Published
- 2018
16. Gondwanatheria and ?Multituberculata (Mammalia) from the Late Cretaceous of Madagascar1.
- Author
-
Krause, David W. and Scott, Craig S.
- Subjects
MULTITUBERCULATA ,CRETACEOUS Period ,MAMMALS ,ANIMAL species ,COMPUTED tomography ,GONDWANA (Continent) - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
- Full Text
- View/download PDF
17. Knot detection in computed tomography images of partially dried jack pine (Pinus banksiana) and white spruce (Picea glauca) logs from a Nelder type plantation
- Author
-
Magnus Fredriksson, Julie Cool, Isabelle Duchesne, and Denis Belley
- Subjects
0106 biological sciences ,Global and Planetary Change ,Annan maskinteknik ,Ecology ,medicine.diagnostic_test ,Forestry ,Computed tomography ,04 agricultural and veterinary sciences ,01 natural sciences ,white spruce ,Internal quality ,Horticulture ,Jack pine ,Knot (unit) ,Botany ,040103 agronomy & agriculture ,medicine ,CT scanning ,0401 agriculture, forestry, and fisheries ,knot detection ,jack pine ,Other Mechanical Engineering ,010606 plant biology & botany ,Mathematics - Abstract
X-ray computed tomography (CT) of logs means possibilities for optimizing breakdown in sawmills. This depends on accurate detection of knots to assess internal quality. However, as logs are stored they dry to some extent, and this drying affects the density variation in the log, and therefore the X-ray images. For this reason it is hypothetically difficult to detect log features in partially dried logs using X-ray CT. This paper investigates the effect of improper heartwood-sapwood border detection, possibly due to partial drying, on knot detection in jack pine (Pinus banksiana Lamb.) and white spruce (Picea glauca (Moench) Voss) logs from New Brunswick, Canada. An automatic knot detection algorithm was compared to manual reference knot measurements, and the results showed that knot detection was affected by detected heartwood shape. It was also shown that logs can be sorted into two groups based on how well the heartwood-sapwood border is detected, to separate logs with a high knot detection rate from those with a low detection rate. In that way, a decision can be made whether or not to trust the knot models obtained from CT scanning. This can potentially aid both sawmills and researchers working with log models based on CT. La tomographie aux rayons X assistée par ordinateur (TO) des billes offre la possibilité d'optimiser le débitage dans les scieries. Cela repose sur la précision avec laquelle les nœuds sont détectés pour évaluer la qualité interne. Cependant, lorsque les billes sont entreposées, elles sèchent jusqu'à un certain point et cela influence la variation de la densité dans les billes, et par conséquent les images radiologiques. Pour cette raison, il est hypothétiquement difficile de détecter les caractéristiques dans les billes partiellement séchées à l'aide de la TO. Cet article étudie l'effet de l'erreur de détection de la limite entre le bois de cœur et le bois d'aubier, potentiellement attribuable au séchage partiel, sur la détection des nœuds dans des billes de pin gris ( Pinus banksiana Lamb.) et d'épinette blanche ( Picea glauca (Moench) Voss) provenant du Nouveau-Brunswick, au Canada. Un algorithme de détection automatisée des nœuds a été comparé à des mesures de référence de nœuds effectuées manuellement. Les résultats ont montré que la forme du bois de cœur qui est détectée influence la détection des nœuds. Il a également été démontré que les billes peuvent être réparties en deux groupes sur la base de la justesse de la détection de la limite entre le bois de cœur et le bois d'aubier, ce qui permet de séparer les billes chez lesquelles le taux de détection des nœuds est élevé de celles chez lesquelles le taux de détection des nœuds est faible. De cette façon, on peut prendre la décision de faire confiance ou non aux nœuds modélisés obtenus avec le balayage par TO. Cela peut possiblement aider tant les scieries que chercheurs qui utilisent la modélisation des billes fondée sur la TO Validerad;2017;Nivå 2;2017-07-03 (andbra)
- Published
- 2017
18. Canadian Geotechnical Journal — Editors' Choices 2020.
- Subjects
COMPUTED tomography - Abstract
The section presents the articles published in the "Canadian Geotechnical Journal" in 2020 that were recognized by Canadian Science Publishing, including "Effect of Relative Density and Biocementation on Cyclic Response of Calcareous Sand" by Peng Xiao et al., "Apparent Salt Diffusion Coefficients for Soil-Bentonite Backfills" by Kristin M. Sample-Lord et al., and "Toward a Generalized Guideline to InformOptimal Site Investigations for Pile Design" by M. P. Crisp et al.
- Published
- 2021
- Full Text
- View/download PDF
19. Clear wood content in standing trees predicted from branch scar measurements with terrestrial LiDAR and verified with X-ray computed tomography
- Author
-
H SauterUdo, KretschmerUrsula, SpieckerHeinrich, M StängleStefan, and BrüchertFranka
- Subjects
040101 forestry ,Global and Planetary Change ,010504 meteorology & atmospheric sciences ,Ecology ,biology ,Light detection ,medicine.diagnostic_test ,Forestry ,Knot (papermaking) ,Computed tomography ,04 agricultural and veterinary sciences ,15. Life on land ,biology.organism_classification ,01 natural sciences ,Lidar ,Fagus sylvatica ,X ray computed ,Content (measure theory) ,Botany ,medicine ,0401 agriculture, forestry, and fisheries ,Beech ,Geology ,0105 earth and related environmental sciences ,Remote sensing - Abstract
Knowledge about the wood quality of standing trees is crucial in that it serves as an excellent means for nearly all stages of the wood-supply chain. Better information about internal wood characteristics can be derived from the outside appearance by establishing a correlation between the bark characteristics of a stem and its internal quality. This paper presents an approach where the quality determination of standing trees using a terrestrial light detection and ranging (LiDAR) system is combined with the information about internal quality of logs using X-ray computed tomography (CT). Results show a high accuracy for branch scar measurements with terrestrial LiDAR and knot measurement with CT. A strong correlation between scar seal quotient and the amount of clear wood could be confirmed using European beech (Fagus sylvatica L.) as an example. Quality grading of virtually segmented logs using terrestrial LiDAR and CT showed moderate correlation; 62.5% of the segments were allocated to the same grade by both approaches. In conclusion, terrestrial LiDAR in forest inventory could be used as an instrument to predict inner wood quality in greater detail by gathering data on the outer appearance and branch scars of standing trees. This additional knowledge has the potential to improve forest planning, bucking instructions, and a roundwood allocation that meets industry demand.
- Published
- 2014
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.