49 results
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2. A new ceratopsid dinosaur (Ornithischia) from the uppermost Horseshoe Canyon Formation (upper Maastrichtian), Alberta, Canada.
- Author
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Xiao-chun Wu, Brinkman, Donald B., Eberth, David A., and Braman, Dennis R.
- Subjects
CERATOPSIDAE ,DINOSAURS ,SKELETON ,CRETACEOUS stratigraphic geology ,FOSSIL reptiles ,VERTEBRATES ,HORSESHOE Canyon Formation (Alta.) - 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
- 2007
- Full Text
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3. Effectiveness of dry ponds for stormwater total suspended solids removal.
- Author
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Shammaa, Y, Zhu, D Z, Gyürék, L L, and Labatiuk, C W
- Subjects
STORMWATER infiltration ,URBAN runoff management ,PONDS - Abstract
This paper reviews the factors and criteria for the design of new and the retrofitting of existing dry detention ponds to enhance removal of total suspended solids (TSS) from stormwater. Detention time is discussed as the most important factor affecting TSS removal. Two-stage facilities and multi-level outlet design are important means of enhancing TSS removal in dry ponds. Two dry ponds within the city of Edmonton were selected to evaluate their TSS removal. The level of expected TSS removal is low owing to the relatively short detention times for both ponds. Methods for retrofitting the dry ponds to enhance TSS removal are discussed.Key words: dry pond, stormwater, TSS removal, detention time, retrofitting.Cet article passe en revue les facteurs et critères de conception de nouveaux étangs de rétention, et de modification de ceux déjà existants, avec pour but d'améliorer la capacité d'enlèvement des substances solides totales en suspension (SST) contenues dans les eaux de ruissellement. Le temps de rétention est examiné en tant que facteur principal affectant l'enlèvement des SST. Les installations à deux étages et la conception de sorties multi-niveaux sont des procédés importants qui améliorent l'enlèvement des SST dans les étangs. Deux étangs de la Ville d'Edmonton ont été sélectionnés et leur capacité de rétention a été évaluée. Le niveau d'enlèvement des SST escompté est bas compte-tenu des temps de rétention relativement courts de ces deux étangs. Les méthodes de modification des étangs visant à améliorer l'enlèvement des SST sont examinées.Mots clés : étang, eaux de ruissellement, enlèvement des SST, temps de rétention, réajustement.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
4. Predictive soil mapping in the Boreal Plains of Northern Alberta by using multi-temporal remote sensing data and terrain derivatives.
- Author
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Sorenson, Preston T., Kiss, Jeremy, Serdetchnaia, Anna, Iqbal, Javed, and Bedard-Haughn, Angela K.
- Subjects
DIGITAL soil mapping ,REMOTE sensing ,MEDIAN (Mathematics) ,INDEPENDENT variables ,DIGITAL elevation models - Abstract
As Canada's vast Boreal Plains are extensively managed, predictive soil mapping could be used as an effective tool to generate high-resolution soil information for the region to inform sustainable resource management. This study aimed to investigate the use of multi-temporal remote sensing data and terrain derivatives to map soil types in the region. A method of constraining subgroup and great-group soil-type predictions based on the predictions at higher-order levels (great-group and order, respectively) was tested. Sentinel time series median values obtained by using Google Earth Engine were tested in combination with first- and second-order digital elevation model derivatives for use as predictor variables in the predictive models. A recursive feature selection process was implemented to reduce the number of predictor variables used in model training. Soil classes were predicted at the order, great-group, and subgroup levels and two approaches were tested. In the first approach, models were unconstrained based on previous predictions. In the second approach, models were constrained to predict only soil great-group classes that occur within the predicted soil order for a given location and similarly predict only soil subgroup classes that occur within the predicted soil great group for a given location. Determined through independent validation testing, the most probable predicted soil maps had overall accuracies ranging from 42% to 68% and kappa scores ranging from 0.33 to 0.48. Overall, the constrained models had the best performance of the approaches tested. Les vastes plaines boréales du Canada étant largement aménagées, une carte prédictive des sols constituerait un bon moyen pour obtenir des données à haute résolution sur les sols régionaux et ainsi faciliter la gestion des ressources durables. Les auteurs ont examiné comment des données de télédétection multitemporelles et les dérivées du terrain pourraient servir à cartographier la nature des sols locaux. Dans cette optique, ils ont testé une méthode qui contraint les prévisions du sous-groupe et du grand groupe de sols d'après les prévisions effectuées à un ordre plus élevé (ceux du grand groupe et de l'ordre, respectivement). La valeur médiane des séries chronologiques sentinelles obtenues avec le moteur Google Earth a été testée en combinaison avec les dérivées de modèles numériques des hauteurs du premier et du deuxième ordre, employées comme variables explicatives dans le modèle prédictif. Pour réduire le nombre de variables explicatives servant à former le modèle, les auteurs ont recouru à un processus récursif de sélection des propriétés du sol. Les classes de sol ont été prédites aux niveaux de l'ordre, du grand groupe et du sous-groupe, et deux approches ont été vérifiées. Dans la première, les auteurs n'ont pas contraint le modèle selon les prévisions antérieures; dans la seconde, le modèle a été contraint afin de ne prédire que les classes du grand groupe dans l'ordre des sols prévu et que celles du sous-groupe dans le grand groupe de sols prévu, pour un endroit donné. Après validation dans le cadre d'un essai indépendant, l'exactitude des cartes des sols prévus les plus probables variait de 42 à 68 % et leur note Kappa allait de 0,33 à 0,48. Les modèles contraints sont généralement ceux qui fonctionnent le mieux parmi les approches testées. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
5. Paleobotany and paleoecology of Gao Mine, a late Paleocene fossil locality near Red Deer, Alberta, Canada1.
- Author
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Stockey, Ruth A., Hoffman, Georgia L., Rothwell, Gar W., and Gardner, James
- Subjects
PALEOBOTANY ,PALEOECOLOGY ,PALEOCENE Epoch ,FOSSIL mammals ,BOTANICAL specimens - 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
6. Application of artificial neural networks in wastewater treatment.
- Author
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El-Din, Ahmed Gamal, Smith, Daniel W., and El-Din, Mohamed Gamal
- Subjects
WASTEWATER treatment ,ARTIFICIAL neural networks ,SEWAGE disposal plants - Abstract
Copyright of Journal of Environmental Engineering & Science 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
- 2004
- Full Text
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7. The oldest occurrence of brachylophosaurin hadrosaurids in Canada.
- Author
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Thompson, Michael G.W., Bedek, Fern V., Schröder-Adams, Claudia, Evans, David C., and Ryan, Michael J.
- Subjects
GROUP formation ,DINOSAURS ,TRIBES ,FOSSILS - 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
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8. A review of nonmarine turtles from the Late Cretaceous of Alberta.
- Author
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Brinkman, Donald B.
- Subjects
FOSSIL turtles ,FOSSILS ,CRETACEOUS stratigraphic geology ,REPTILES - Abstract
Discusses nonmarine fossil turtles preserved from the Late Cretaceous epoch of Alberta. Materials and methods; Turtle assemblages; Discussion.
- Published
- 2003
- Full Text
- View/download PDF
9. Herbicide strategies for managing glyphosate-resistant and -susceptible kochia (Bassia scoparia) in spring wheat.
- Author
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Torbiak, Alysha T., Blackshaw, Robert E., Brandt, Randall N., Hamman, Bill, and Geddes, Charles M.
- Subjects
WHEAT ,WEED control ,PROTOPORPHYRINOGEN oxidase ,ACETOLACTATE synthase ,HERBICIDE-resistant crops ,HERBICIDE resistance ,HERBICIDES - Abstract
Copyright of Canadian Journal of Plant Science 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
10. Quantitative risk assessment of rock slope instabilities that threaten a highway near Canmore, Alberta, Canada: managing risk calculation uncertainty in practice.
- Author
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Macciotta, Renato, Gräpel, Chris, Keegan, Tim, Duxbury, Jason, and Skirrow, Roger
- Subjects
ROCK slopes ,RISK assessment ,PUBLIC safety ,ROAD users ,ROCKFALL ,TRAFFIC safety - 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
11. Soil respiration and net ecosystem productivity in a chronosequence of hybrid poplar plantations.
- Author
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Chang, Scott X., Shi, Zheng, and Thomas, Barb R.
- Subjects
SOIL respiration ,PLANTATIONS ,COTTONWOOD ,ECOSYSTEM dynamics ,TUNDRAS ,CROP rotation - Abstract
Copyright of Canadian Journal of Soil Science 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
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12. Lime softening clarifier modeling with artificial neural networks.
- Author
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Shariff, Riyaz, Cudrak, Audrey, and Stanley, Stephen J.
- Subjects
ARTIFICIAL neural networks ,WATER softening ,WATER treatment plants ,WATER utilities - Abstract
Copyright of Journal of Environmental Engineering & Science 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
- 2004
- Full Text
- View/download PDF
13. Part 2: Artificial neural network applications in drinking water supply / Partie 2 : les applications des réseaux neuronaux artificiels à l’approvisionnement en eau potable - Implementing artificial neural network models for real-time water colour forecasting in a water treatment plant
- Author
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Zhang, Qing J., Cudrak, Audrey A., Shariff, Riyaz, and Stanley, Stephen J.
- Subjects
ARTIFICIAL neural networks ,WATER purification ,WATER treatment plants - Abstract
Copyright of Journal of Environmental Engineering & Science 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
- 2004
- Full Text
- View/download PDF
14. Predicting total trihalomethane formation in finished water using artificial neural networks.
- Author
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Lewin, Nicola, Zhang, Qing, Chu, Lingling, and Shariff, Riyaz
- Subjects
ARTIFICIAL neural networks ,WATER purification ,TRIHALOMETHANES ,WATER treatment plants - Abstract
Copyright of Journal of Environmental Engineering & Science 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
- 2004
- Full Text
- View/download PDF
15. Assessment of seven Canadian rivers in relation to stages in oil sands industrial development, 1972-2010.
- Author
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Alexander, A. C. and Chambers, P. A.
- Subjects
OIL sands ,INDUSTRIALIZATION ,RIVERS ,OIL shales ,WATER quality - Abstract
Copyright of Environmental Reviews 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
- 2016
- Full Text
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16. Geothermal exploration of Paleozoic formations in Central Alberta.
- Author
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Weides, Simon, Moeck, Inga, Majorowicz, Jacek, Palombi, Dan, Grobe, Matthias, and Mareschal, Jean-Claude
- Subjects
GEOTHERMAL ecology ,PALEOZOIC paleogeography ,GEOLOGICAL formations ,GEOLOGICAL modeling ,GEOLOGICAL surveys ,GEOLOGICAL statistics - 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
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17. Non-trionychid turtles from the Paleocene of Alberta, Canada1.
- Author
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Brinkman, Donald B. and Gardner, James
- Subjects
SOFT-shelled turtles ,PALEOCENE Epoch ,FOSSIL mammals ,GEOLOGICAL formations ,CRETACEOUS Period - 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
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18. First mammals from the Paleocene Porcupine Hills Formation of southwestern Alberta, Canada1.
- Author
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Scott, Craig S., Spivak, Daniel N., Sweet, Arthur R., and Sues, Hans
- Subjects
MAMMALS ,GEOLOGICAL formations ,PALEOCENE Epoch ,ANIMAL diversity - 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
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19. Scolosaurus cutleri (Ornithischia: Ankylosauria) from the Upper Cretaceous Dinosaur Park Formation of Alberta, Canada.
- Author
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Penkalski, Paul, Blows, William T., and Sues, Hans
- Subjects
ORNITHISCHIA ,CRETACEOUS Period ,ANKYLOSAURIDAE ,COMPARATIVE studies ,SCOLOSAURUS - 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
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20. A new ceratopsid from the Foremost Formation (middle Campanian) of Alberta.
- Subjects
CERATOPSIDAE ,DINOSAURS ,PHYLOGENY ,CENTROSAURUS - 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
- 2012
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21. Nearshore articulate crinoid from the Albian of Alberta, Canada (Early Cretaceous, Echinodermata).
- Author
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Ausich, William I., Buckley, Robin A., Plint, A. Guy, and Jin, Jisuo
- Subjects
FOSSIL crinoidea ,ECHINODERMATA ,SANDSTONE ,SHORELINES ,CRETACEOUS stratigraphic geology ,PALEOECOLOGY ,SEDIMENTATION & deposition - 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
- 2011
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22. Estimating past and future dinosaur skeletal abundances in Dinosaur Provincial Park, Alberta, Canada.
- Author
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Henderson, Donald M. and Tanke, Darren H.
- Subjects
DINOSAURS ,SKELETON ,SKULL ,ESTIMATION theory - 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
- 2010
23. Stratigraphy, sedimentology, and taphonomy of the Albertosaurus bonebed (upper Horseshoe Canyon Formation; Maastrichtian), southern Alberta, Canada.
- Author
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Eberth, David A. and Currie, Philip J.
- Subjects
ALBERTOSAURUS ,BONES ,FOSSIL animals ,STRATIGRAPHIC geology ,SEDIMENTOLOGY ,TAPHONOMY ,HORSESHOE Canyon Formation (Alta.) - Abstract
The Albertosaurus bonebed provides evidence for the mass-mortality of at least 12 Albertosaurus. Albertosaurus, other vertebrates, and trees are concentrated on upper point bar surfaces of a small meandering paleochannel. Throughout the field area, Albertosaurus, other vertebrates, and coalified plants are also preserved patchily in overbank mudstones at the same horizon. Although the bonebed is dominated by Albertosaurus, there are also sparse macrofossil remains of Hypacrosaurus and Albertonykus. The basal lag yields vertebrate microfossils containing at least 19 additional taxa. Freshwater invertebrates are preserved at and below the base of the paleochannel. Large elements are over represented at the site, whereas smaller elements are under represented, suggesting hydraulic sorting. The taphonomic signature of the site suggests that death, disarticulation, and burial took place within one year. We conclude that one or more storms of large intensity downed trees and temporarily drowned the paleolandscape, ultimately killing the tyrannosaurids directly or indirectly. Logs and carcasses were reworked on a point bar during the waning stages of the storm and over subsequent years. Scavenging and breakage of remains by large carnivores was probably inhibited by the mixed log and bone jam. Remains of smaller scavengers (small theropods and snails) are plentiful suggesting these forms were more successful at accessing remains. Juvenile Albertosaurus are under represented at the site suggesting the possibility of age segregation. Because the group of Albertosaurus may have been forced together by rising floodwaters, it is not possible to assess the degree to which the taxon was gregarious from these data alone. Le gisement d'ossements d'Albertosaurus témoigne de la mortalité massive d'au moins douze Albertosaurus. Albertosaurus, d'autres vertébrés et des arbres sont concentrés sur des surfaces supérieures de barre de méandre d'un petit paléochenal méandrique. Dans toute la région, Albertosaurus, d'autres vertébrés et des plantes carbonisées sont également préservés par endroits dans des mudstones de débordement situés au même horizon. Bien que le gisement d'ossements soit dominé par Albertosaurus, il présente également ça et là des restes de macrofossiles d'Hypacrosaurus et d'Albertonykus. Le dépôt de déflation à la base du paléochenal présente des microfossiles de vertébrés d'au moins 19 autres taxons. Des invertébrés d'eau douce sont préservés à la base du paléochenal et sous celle-ci. Les grands éléments sont sur-représentés dans le site, alors que les éléments plus petits sont sous-représentés, ce qui suggère un tri hydraulique. La signature taphonomique du site suggère que la mort, la désarticulation et l'enfouissement ont eu lieu dans la même année. Il est conclu qu'une ou plusieurs tempêtes de forte intensité ont abattu les arbres et provisoirement noyé le paléopaysage, entraînant finalement la mort directe ou indirecte des tyrannosauridés. Les billots et les carcasses ont été remaniés sur une barre de méandre vers la fin de la tempête et au cours des années subséquentes. L'embâcle de billes et d'ossements a probablement empêché la récupération et le bri des restes par des grands carnivores. La présence de nombreux restes de détritivores plus petits (petits théropodes et escargots) donne à penser que ces animaux pouvaient accéder aux restes plus efficacement. Les Albertosaurus juvéniles sont sous-représentés dans le site, ce qui porte à croire à une ségrégation selon l'âge. tant donné que la montée des eaux pourrait avoir provoqué le rassemblement du groupe d'Albertosaurus, il est n'est pas possible d'évaluer le degré de grégarisme de ce taxon à la lumière de ces seules données. [ABSTRACT FROM AUTHOR]
- Published
- 2010
24. A new articulated freshwater fish (Clupeomorpha, Ellimmichthyiformes) from the Horseshoe Canyon Formation, Maastrichtian, of Alberta, Canada.
- Author
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Newbrey, Michael G., Murray, Alison M., Brinkman, Donald B., Wilson, Mark V. H., and Neuman, Andrew G.
- Subjects
FRESHWATER fishes ,ALBERTOSAURUS ,BONES ,FOSSIL animals ,CRETACEOUS paleontology ,HORSESHOE Canyon Formation (Alta.) - Abstract
Horseshoeichthys armaserratus, gen. et sp. nov., (Clupeomorpha: Ellimmichthyiformes: Sorbinichthyidae) is described from the Horseshoe Canyon Formation (Maastrichtian), Albertosaurus bonebed locality, Alberta, Canada. Horseshoeichthys armaserratus is classified as an ellimmichthyiform based on the following characters: the presence of a sixth infraorbital with a sensory canal that leads to the fifth infraorbital, absence of a supraorbital bone, subrectangular predorsal scutes, parietals in contact with each other at the midline, and two supramaxillae. The specimen is classified in the Sorbinichthyidae Family as it has abdominal ribs articulating in pits on the centra, posterior spines on predorsal scutes, and absence of a median spine on predorsal scutes. A new genus and species is proposed based on the presence of (anteriorly) Y-shaped mesethmoid, supraorbital, subrectangular predorsal scutes with coarse, rounded serrae on the posterior margin and a large anterior projection, scales with serrae on the circuli, and two postcleithra. This specimen represents the first freshwater ellimmichthyiform from the Upper Cretaceous of North America and the highest paleolatitude (59°N) occurrence known for the family. Furthermore, the dentary and centra have distinctive morphologies that are matched by specimens in microvertebrate localities from three underlying formations, including the Milk River Formation (Santonian), which indicates at least a 14 million year history for this lineage. Horseshoeichthys armaserratus, gen. et sp. nov., (Clupeomorpha: Ellimmichthyiformes: Sorbinichthyidae), de la localité du gisement d'ossements d'Albertosaurus de la Formation de Horseshoe Canyon (Maastrichtien), en Alberta, au Canada, est décrit. Horseshoeichthys armaserratus est affecté aux ellimmichthyiformes à la lumière des caractères suivants : la présence d'un sixième sous-orbitaire présentant un canal sensoriel qui mène au cinquième sous-orbitaire, l'absence d'un os sus-orbitaire, des plaques osseuses pré-dorsales sub-rectangulaires, des pariétaux en contact les uns avec les autres au niveau de la ligne médiane et deux sus-maxillaires. Le spécimen est affecté aux sorbinichthyidés puisqu'il présente des côtes abdominales s'articulant dans des fosses sur le centrum et des épines postérieures sur les plaques osseuses pré-dorsales, et que ces dernières n'ont pas d'épine médiane. Un nouveau genre et une nouvelle espèce sont proposés à la lumière de la présence d'un mésethmoïde (antérieurement) en forme de Y, d'un sus-orbitaire, de plaques osseuses pré-dorsales sub-rectangulaires présentant des stries arrondies et épaisses sur leur bord libre postérieur et une grande projection antérieure, d'écailles avec des stries sur le circulus et de deux postcleithra. Ce spécimen représente le premier ellimmichthyiforme d'eau douce du Crétacé supérieur de l'Amérique du Nord et l'exemple connu de cette famille provenant de la plus haute paléolatitude (59
o N). En outre, le dentaire et le centrum présentent des morphologies particulières semblables à celles de spécimens trouvés dans des localités de microvertébrés de trois formations sous-jacentes, dont la Formation de Milk River (Santonien), ce qui indique une histoire d'au moins 14 millions d'années pour cette lignée. [ABSTRACT FROM AUTHOR]- Published
- 2010
25. Palaeopathological changes in a population of Albertosaurus sarcophagus from the Upper Cretaceous Horseshoe Canyon Formation of Alberta, Canada.
- Author
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Bell, Phil R.
- Subjects
ALBERTOSAURUS ,PALEOPATHOLOGY ,ANIMAL populations ,ARCHAEOLOGICAL excavations ,BONES ,FOSSIL animals ,HORSESHOE Canyon Formation (Alta.) - Abstract
Over the past decade, excavations of a monodominant theropod bonebed from the lower Maastrichtian beds of the Horseshoe Canyon Formation have recovered a minimum number of 26 individuals of the tyrannosaur, Albertosaurus sarcophagus. Examination of skeletal elements from the bonebed revealed a small number of abnormalities from at least two individuals. These include bony spurs (enthesophytes) of unknown origin on three pedal phalanges. Well-healed fracture calluses are present on two rib shafts and a gastralia element. The left dentary of one adult preserves both healed and unhealed parallel bite marks and a perforative lesion attributable to a partially healed, mechanically induced puncture wound. Unfortunately, the limited range in the types and frequencies of pathological changes provides only little information on the distribution of such phenomena but may be suggestive of the overall 'health' of the population. Au cours de la dernière décennie, des excavations d'un gisement d'ossements à théropodes monodominant dans des lits du Maastrichtien inférieur de la Formation de Horseshoe Canyon ont produit un minimum de 26 exemplaires du tyrannosaure Albertosaurus sarcophagus. L'examen d'éléments squelettiques provenant du gisement a révélé un petit nombre d'anomalies chez au moins deux exemplaires, dont des éperons osseux (enthésophytes) d'origine inconnue sur trois phalanges pédieuses. Des cals de fractures bien consolidées sont présents sur deux diaphyses de côte et un élément de gastralium. L'os dentaire gauche d'un adulte conserve des marques de morsure parallèles guéries et non guéries, ainsi qu'une lésion perforante attribuable à une plaie punctiforme d'origine mécanique partiellement guérie. Malheureusement, la gamme limitée des types et des fréquences de modifications pathologiques ne fournit que peu d'information sur la distribution de ces phénomènes, mais pourrait être un indicateur de la « santé » globale de la population. [ABSTRACT FROM AUTHOR]
- Published
- 2010
26. A revised life table and survivorship curve for Albertosaurus sarcophagus based on the Dry Island mass death assemblage.
- Author
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Erickson, Gregory M., Currie, Philip J., Inouye, Brian D., and Winn, Alice A.
- Subjects
ALBERTOSAURUS ,ARCHAEOLOGICAL finds ,BONES ,FOSSIL animals ,ZOOARCHAEOLOGY - Abstract
In 1910 a crew from the American Museum of Natural History discovered a bone bed composed primarily of the large tyrannosaurid Albertosaurus sarcophagus in what is now Dry Island Buffalo Jump Provincial Park in Alberta, Canada. Study of the remains from the site allowed the first life table and survivorship curve for a non-avian dinosaur to be created. These have served as a model for subsequent studies of dinosaurian population biology. Since 2006, the discovery and preparation of hundreds of new elements from the bone bed stand to substantially increase the minimum number of individuals (MNI) represented. This would allow testing of previous conclusions regarding the population biology of these animals and refinement of our understanding of the patterns of survivorship. Here, four formerly unrecognized individuals from the Dry Island assemblage are revealed and a revised life table presented. As in the previous analysis, a left skewed age distribution and sigmoidal survivorship pattern were found. Annual mortality rates averaged 3.47% between ages two and 13 and then increased to a mean of 19.5% prior to extinction of the cohort after 28 years of age. Mean life expectancy for individuals surviving to two years of age was 15.19 years. Mid-life increase in attrition corresponds to entrance into the breeding population. The MNI is unlikely to substantially increase, and new individuals are unlikely to affect the pattern of survivorship inferred here. Nevertheless, future excavations stand to reveal more about the anatomical and pathological variance within the Dry Island Albertosaurus population. En 1910, une équipe du American Museum of Natural History découvrait un gisement d'ossements composé principalement de restes du grand tyrannosauridé Albertosaurus sarcophagus, dans l'actuel territoire du parc provincial de Dry Island Buffalo Jump, en Alberta (Canada). L'étude des restes prélevés du site permettait l'établissement des premières table de vie et courbe de survie pour un dinosaure non aviaire, qui ont servi de modèles pour des études subséquentes de la biologie des populations des dinosaures. La découverte et la préparation, de puis 2006, de centaines de nouveaux éléments provenant du gisement d'ossements devraient accroître considérablement le nombre minimum d'exemplaires (NME) représentés, ce qui permettrait de vérifier des conclusions antérieures concernant la biologie des populations de ces animaux et d'améliorer la compréhension des patrons de survie. Quatre exemplaires provenant de Dry Island qui, à ce jour, n'étaient pas reconnus sont révélés ici, et une table de vie révisée est présentée. Comme dans l'analyse précédente, une distribution des âges désaxée vers la gauche et un patron de survie sigmoïde sont obtenus. La moyenne des taux de mortalité annuelle est de 4,47 % pour les exemplaires de deux à 13 ans, et augmente à 19,5 % pour les exemplaires de 28 ans et plus, avant l'extinction de la cohorte. L'espérance de vie moyenne pour les exemplaires qui atteignent deux ans est de 15,19 ans. L'augmentation de l'attrition à mi-vie correspond à l'entrée dans la population en âge de reproduction. Il est peu probable que le NME augmente de manière importante et que l'ajout de nouveaux exemplaires change le patron de survie obtenu. Ceci dit, de nouvelles excavations devraient fournir plus d'information sur la variance anatomique et pathologique au sein de la population d'Albertosaurus de Dry Island. [ABSTRACT FROM AUTHOR]
- Published
- 2010
27. A history of Albertosaurus discoveries in Alberta, Canada.
- Author
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Tanke, Darren H. and Currie, Philip J.
- Subjects
ALBERTOSAURUS ,ANIMAL classification ,TYRANNOSAURIDAE ,SKULL ,SKELETON - Abstract
After many years of taxonomic uncertainty, Albertosaurus was established as a new genus in 1905, the year Alberta became a province of Canada. Gorgosaurus is a closely related tyrannosaurid from the Judithian beds of southern Alberta that was subsequently synonymized with Albertosaurus. Although most researchers consider the genera as distinct, there has been considerable confusion over the temporal and geographic range of Albertosaurus. Albertosaurus sarcophagus is only known from 13 skulls and (or) skeletons of varying completeness, and one (possibly two) bonebeds, all from the Horseshoe Canyon Formation (Campanian-Maastrichtian) of Alberta. Many of the major Albertosaurus specimens are scientifically compromised due to poor collection techniques, incomplete locality and stratigraphic information, politics, vandalism, accidents, gunplay, and landowner issues. The background of each specimen is discussed to eliminate some of the sources of confusion and to document how much of each specimen is preserved. Après de nombreuses années d'incertitude taxonomique, le nouveau genre Albertosaurus était établi en 1905, année où l'Alberta devenait une province du Canada. Par la suite, Gorgosaurus, un tyrannosauridé étroitement apparenté provenant de lits judithiens du sud de l'Alberta, était synonymisé avec Albertosaurus. Bien que la plupart des chercheurs considèrent que ces genres sont distincts, une certaine confusion règne concernant la portée temporelle et géographique d'Albertosaurus. La connaissance d'Albertosaurus sarcophagus ne repose que sur treize crânes ou squelettes de divers degrés de complétude et sur un (possiblement deux) gisement d'ossements, tous de la Formation de Horseshoe Canyon (Campanien-Maastrichtien) de l'Alberta. L'intégrité, du point de vue scientifique, de bon nombre des principaux spécimens d'Albertosaurus est compromise en raison de mauvaises techniques de prélèvement, de renseignements géographiques et stratigraphiques incomplets, de questions de nature politique, de vandalisme, d'accidents, de tirs d'armes à feu et de problèmes avec des propriétaires fonciers. Le contexte de chacun des spécimens est examiné afin d'éliminer certaines sources de confusion et de documenter le degré de préservation de chaque spécimen. [ABSTRACT FROM AUTHOR]
- Published
- 2010
28. Physical and hydraulic characterization of fractured, hydrophobic sulphur within above-ground sulphur blocks.
- Author
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Bonstrom, Kristie, Barbour, S. Lee, and Hendry, M. Jim
- Subjects
SULFUR ,OIL sands ,SOIL oxidation ,SOIL porosity ,WATER storage ,X-ray spectroscopy - 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
- 2009
- Full Text
- View/download PDF
29. 25 years of movement monitoring on South Peak, Turtle Mountain: understanding the hazard.
- Author
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Froese, Corey R., Moreno, Francisco, Jaboyedoff, Michel, and Cruden, David M.
- Subjects
GEOLOGICAL research ,AVALANCHE accidents ,LANDSLIDES ,MINERAL industry accidents ,RISK assessment ,PREVENTION - 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
- 2009
- Full Text
- View/download PDF
30. Diversity and variation of theropod dinosaur teeth from the uppermost Santonian Milk River Formation (Upper Cretaceous), Alberta: a quantitative method supporting identification of the oldest dinosaur tooth assemblage in Canada.
- Author
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Larson, Derek W.
- Subjects
FOSSIL teeth ,FOSSIL vertebrates ,FOSSILS ,FOSSIL reptiles ,DINOSAURS ,COULEES ,MULTIVARIATE analysis - Abstract
The Santonian Deadhorse Coulee Member of the Milk River Formation preserves the oldest dinosaur body fossils found in Alberta. However, vertebrate remains consist almost exclusively of isolated elements and microvertebrate assemblages. Here, 1572 relatively complete shed non-avian theropod teeth from 20 localities in the Deadhorse Coulee Member are measured and analyzed to assess species diversity. Teeth are referred to or similar to Tyrannosaurinae indet., cf. Richardoestesia gilmorei, cf. Richardoestesia isosceles, Dromaeosauridae indet., Dromaeosaurinae indet., Velociraptorinae indet., and cf. Paronychodon lacustris. For the taxa identified, the large sample size allows for the assessment of their range of variation and accurate identification, without the benefit of comparable material of this age. Multivariate statistics, including a principal component analysis and a canonical variate analysis, provide reasonable separation of all taxa, although better results are achieved by separate analyses based on qualitative observations of denticle shape. The best results of the canonical variate analysis identified 96.0% of specimens correctly. This corroborates the qualitative identification of specimens and illustrates a valid way of evaluating diversity in areas and formations from which no described jaw material is known. Le membre santonien de Deadhorse Coulee, de la Formation de Milk River, renferme les plus anciens fossiles corporels de dinosaures trouvés en Alberta. Toutefois, les restes de vertébrés sont constitués presque exclusivement d’éléments isolés et d’assemblages de microvertébrés. Dans la présente étude, 1572 dents perdues relativement complètes de théropodes non-aviens provenant de plus de 20 localités dans le membre de Deadhorse Coulee ont été mesurées et analysées afin d’évaluer la diversité spécifique. Ces dents sont attribuées à Tyrannosaurinae indet., cf. Richardoestesia gilmorei, cf. Richardoestesia isosceles, Dromaeosauridae indet., Dromaeosaurinae indet., Velociraptorinae indet., et cf. Paronychodon lacustris. Pour les taxons identifiés, la taille importante de l’échantillon permet l’évaluation de leur variabilité et de l’exactitude d’une identification réalisée sans le recours à du matériel comparable du même âge. Des méthodes de statistique multivariée, dont l’analyse en composantes principales et l’analyse canonique, permettent une séparation raisonnablement fiable de tous les taxons, bien que des analyses basées sur la description qualitative de la forme des denticules donnent de meilleurs résultats. Dans les meilleurs cas, l’analyse canonique permet l’identification exacte de 96,0 % des spécimens. Ceci corrobore l’identification qualitative des spécimens et illustre une approche valide d’évaluation de la diversité dans des régions ou formations dont du matériel maxillaire n’a pas encore été décrit. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
31. Rapid cold water formation and recrystallization of relict bryophyte tufa at the Fall Creek cold springs, Alberta, Canada.
- Author
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Rainey, Dustin K. and Jones, Brian
- Subjects
BRYOPHYTES ,CALCITE ,FERN gametophytes ,CARBON isotopes ,NATIONAL parks & reserves ,INCRUSTATIONS ,RECRYSTALLIZATION (Geology) - 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
- 2007
- Full Text
- View/download PDF
32. Hydrodynamic and physical assessment of ice-covered conditions for three reaches of the Athabasca River, Alberta, Canada.
- Author
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Katopodis, C. and Ghamry, H. K.
- Subjects
HYDRODYNAMICS ,ICE on rivers, lakes, etc. ,PHYSICAL measurements ,RIVERS ,WATER distribution ,FISH habitats ,PETROLEUM geology ,FLUID dynamics - Abstract
Copyright of Canadian Journal of Civil Engineering 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
- 2007
- Full Text
- View/download PDF
33. A new paraclupeid fish (Clupeomorpha, Ellimmichthyiformes) from a muddy marine pro-delta environment: middle Cenomanian Dunvegan Formation, Alberta, Canada.
- Author
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Hay, Michael J, Cumbaa, Stephen L., Murray, Alison M., and Plint, A. Guy
- Subjects
FOSSIL clupeidae ,SEDIMENTATION & deposition ,FISH age ,MARINE biology research ,DEEP-sea temperature ,THERMOCLINES (Oceanography) ,OCEANOGRAPHIC research - 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
- 2007
- Full Text
- View/download PDF
34. Supercritical sewer flows at a combining junction: A model study of the Edworthy trunk junction, Calgary, Alberta.
- Author
-
Can-Hua Zhao, Zhu, David Z., and Rajaratnam, Nallamuthu
- Subjects
SEWERAGE fluid dynamics ,SEWERAGE ,SUPERCRITICAL fluids ,SEWER districts ,FLUID dynamics - Abstract
Copyright of Journal of Environmental Engineering & Science 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
- 2004
- Full Text
- View/download PDF
35. Paleoenvironmental interpretation of the paleosols and sediments at the Stampede site (DjOn-26), Cypress Hills, Alberta.
- Author
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Klassen, Judith
- Subjects
PALEOPEDOLOGY ,SEDIMENTS ,HISTORIC sites ,RADIOCARBON dating ,ALLUVIUM ,PHYTOLITHS - 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
- 2004
- Full Text
- View/download PDF
36. A new species of the ptilodontid multituberculate Prochetodon (Mammalia, Allotheria) from the Paleocene Paskapoo Formation of Alberta, Canada.
- Author
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Scott, Craig S.
- Subjects
NOTODONTIDAE ,PALEOCENE stratigraphic geology ,PHYLOGENY ,EMIGRATION & immigration - 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
- 2004
- Full Text
- View/download PDF
37. Spray freezing treatment of water from oil sands tailing ponds.
- Author
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Sego, D C, Smith, D W, and Gao, W
- Subjects
FREEZING process (Water purification) ,SEWAGE purification ,OIL sands ,PONDS ,BITUMEN ,INDUSTRIAL wastes - Abstract
Copyright of Journal of Environmental Engineering & Science 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
- 2003
38. Results of a pilot study to examine the effective integration of apprentices into the industrial construction sector.
- Author
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Fayek, Aminah Robinson, Shaheen, Ahmed, and Oduba, Ayo
- Subjects
APPRENTICES ,EMPLOYMENT ,CONSTRUCTION industry ,LABOR supply - Abstract
Presents a study that investigated the impact of the employment of apprentices in the industrial construction sector in Alberta. Background on the shortage of skilled workers in the industrial construction sector in Alberta; Analysis of methods of increasing the use of apprentices while enhancing their on-the-job experiences; Results and implications.
- Published
- 2003
- Full Text
- View/download PDF
39. Probabilistic stability analysis of a tailings dyke on presheared clay-shale.
- Author
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El-Ramly, H., Morgenstern, N.R., and Cruden, D.M.
- Subjects
DIKES (Engineering) ,FLOOD dams & reservoirs ,HYDRAULIC structures - Abstract
Presents a study that applied a spreadsheet-based, probabilistic slope analysis methodology to evaluate the stability of a section of the Syncrude Tailings Dyke in Fort McMurray, Alberta. Height of the dyke; Performance of the dyke; Techniques used in quantifying the various components of parameter uncertainty.
- Published
- 2003
- Full Text
- View/download PDF
40. New biostratigraphicdata from the Lower Jurassic Fernie Formation in the Subsurface of west-central Alberta and their stratigraphic implications.
- Author
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Asgar-Deen, Michele, Hall, Russell, Craig, Jim, and Riediger, Cynthia
- Subjects
JURASSIC stratigraphic geology - Abstract
Presents a study that examined biostratigraphic data from the lower Jurassic formation in the subsurface of west-central Alberta and their stratigraphic implications. Lower Jurassic stratigraphic framework of the western Canada sedimentary basin; Study area and sample locations; Stratigraphic relationships among lower Fernie formation units and subsurface to surface correlations.
- Published
- 2003
- Full Text
- View/download PDF
41. Litho- and chronostratigraphic relationships of the Santonian–Campanian Milk River Formation in southern Alberta and Eagle Formation in Montana utilising stratigraphy, U–Pb geochronology, and palynology.
- Author
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Payenberg, Tobias HD, Braman, Dennis R, Davis, Donald W, and Miall, Andrew D
- Subjects
GEOLOGICAL time scales ,ROCKS - Abstract
U–Pb geochronology, palynology, and lithostratigraphy were employed on the Late Cretaceous rocks in southern Alberta and Montana to solve litho- and chronostratigraphic correlation problems. In the outcrop area around Writing-On-Stone Provincial Park, southern Alberta, the Milk River Formation has a Santonian to possibly very earliest Campanian age and was deposited between ~84.5 Ma and 83.5 Ma. In southern Montana, the Eagle Formation was deposited from ~83.5 Ma to 81.2 Ma, and contains different lithologies and depositional environments as opposed to southern Alberta. In north-central Montana, the Telegraph Creek Formation and Virgelle and Deadhorse Coulee members are equivalent in depositional environments and time to those of the Milk River Formation in southern Alberta. The upper Eagle member, however, has no time- or facies-equivalent rocks around Writing-On-Stone Provincial Park, but is time equivalent to the Alderson Member of the Lea Park Formation in southeastern Alberta. A hiatus of ~2.5 Ma is present between the top of the Milk River Formation in the outcrop area and the basal beds of the Pakowki Formation. The Pakowki transgression occurred at around 81.0 Ma based on a U–Pb zircon age of 80.7 ± 0.2 Ma from bentonite beds just above the bottom of the Pakowki Formation in southern Alberta. This age agrees with previous ages of 80.7 ± 0.6 Ma for the Ardmore Bentonite Beds and ~81.0 Ma for the Claggett transgression in southern Montana.Afin de résoudre des problèmes de corrélations lithostratigraphiques et chronostratigraphiques, on s'est servi de géochronologie U–Pb, de palynologie et de lithostratigraphie sur des roches du Crétacé tardif du sud de l'Alberta et du Montana. Dans la région des affleurements autour du parc provincial de Writing-On-Stone, au sud de l'Alberta, la Formation de Milk River date possiblement du Santonien au Campanien très précoce et aurait été déposée il y a environ 84,5 à 83,5 Ma. Dans le sud du Montana, la Formation Eagle a été déposée il y a environ 83,5 à 81,2 Ma; elle présente des lithologies et des milieux de déposition différents de ceux du sud de l'Alberta. Dans le centre-nord du Montana, la Formation de Telegraph Creek et les membres Virgelle et Deadhorse Coulee ont des milieux et des temps de déposition équivalents à ceux de la Formation de Milk River du sud de l'Alberta. Toutefois, le membre supérieur de Eagle n'a d'équivalent ni dans le temps ni dans les faciès dans les roches autour du parc provincial de Writing-On-Stone, mais il est équivalent dans le temps au membre Alderson de la Formation de Lea Park dans le sud-est de l'Alberta. Il existe un hiatus d'environ 2,5 Ma entre le sommet de la Formation de Milk River dans la région des affleurements et les lits à la base de la Formation de Pakowki. La transgression de Pakowki a eu lieu vers 81,0 Ma selon une détermination d'âge U–Pb de 80,7 ± 0,2 Ma sur un échantillon de zircon provenant de lits de bentonite juste au-dessus de la base de la Formation de Pakowki dans le sud de l'Alberta. Cet âge concorde avec des âges obtenus antérieurement de 80,7 ± 0,6 Ma pour les lits de bentonite Ardmore et d'environ 81,0 Ma pour la transgression de Claggett dans le sud du Montana.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
42. The Eureka River landslide and dam, Peace River Lowlands, Alberta.
- Author
-
Miller, B G.N and Cruden, D M
- Subjects
RIVERS ,LANDSLIDES ,GEOMORPHOLOGY ,PHYSICAL geography - Abstract
The Eureka River landslide of June 1990, at 50 Mm[sup 3] , is one of the largest historical landslides on the Interior Plains of Canada. It is one of seven large translational landslides to have occurred in the Peace River Lowlands within the last 65 years. Each landslide occurred in Quaternary sediments deposited within a preglacial valley. Each landslide formed a dam. The rupture surface of the Eureka River landslide in preglacial lacustrine sediment, 125 m below the Peace River Lowlands plains, extended beneath the river channel causing the channel to be elevated. The resulting landslide dam was over 20 m high, forming a lake exceeding 8 km in length. The river cut a new channel around the toe of the landslide, abandoning the prelandslide channel. As the new channel is free of armour, incision has been rapid. After 10 years, the dam now stands approximately 5 m high.Key words: landslide, landslide dam, Peace River, Alberta, preglacial valley, geomorphology.Le glissement de la rivière Eureka de juin 1990, ayant un volume de 50 Mm[sup 3] , est un des plus importants glissements historiques des Plaines intérieures du Canada. Il est un des sept grands glissements translationnels à s'être produits dans les Basses-Terres de la rivière Peace au cours des 65 dernières années. Chaque glissement s'est produit dans les sédiments du Quaternaire déposés dans une vallée préglaciaire. Chaque glissement forme un barrage. La surface de rupture du glissement de la rivière Eureka dans le sédiment lacustre préglaciaire, localisée à 125 m sous les plaines des Basses-Terres de la rivière Peace, s'étendait sous le canal de la rivière produisant un soulèvement du canal. Le barrage du glissement résultant avait plus de 20 m de hauteur, formant un lac excédant 8 km de longueur. La rivière s'est frayé un nouveau canal autour du pied du glissement, abandonnant le canal existant avant le glissement. Comme le nouveau canal était libre d'armature, l'entaille a été rapide. Après 10 ans, le barrage mesure maintenant environ 5 m de hauteur.Mots clés : glissement, barrage de glissement, rivière Peace, Alberta, vallée préglaciaire, géomorphologie.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
43. Modelling approach for high flow rate in wastewater treatment operation.
- Author
-
El-Din, A G and Smith, D W
- Subjects
WASTEWATER treatment ,WASTE management ,ARTIFICIAL neural networks - Abstract
The vast majority of models developed for wastewater treatment and receiving water systems have been of the distributed-parameter and state-space (lumped-parameter) forms. On the other hand, most control system design methods and, for that matter, methods of system identification refer to the black box class of models and in particular the time series models. In the current study two modelling techniques of the black box class of models were used to model the data collected from full-scale treatment operations at the Gold Bar Wastewater Treatment Plant (GBWWTP), the largest plant in the Edmonton area (Alberta, Canada). An artificial neural network was trained to make short-term predictions of the quantity of wastewater entering the plant during storm events using rainfall data collected from eight gauges covering the parts of the city that are serviced by combined sewers. After training, the model was able to generalize very well when tested against an unseen set of data. Transfer function time series models were used to model the quality data collected from a primary sedimentation tank at the plant. The models were able to make hourly predictions of the total suspended solids and chemical oxygen demand in the primary effluent. The presented models have the predictiveness and adaptiveness requirements needed for models that could be utilized as part of a real-time control system. Key words: dynamic modelling, artificial neural networks, transfer-function models, wastewater inflow, primary sedimentation.La grande majorité des modèles développés pour les systèmes de traitement des eaux usées et des milieux récepteurs sont du style paramètres distribués et états-espaces (paramètres localisés). Par contre, les méthodes de conception de systèmes de contrôle et, par le fait même, les méthodes d'identification de systèmes font référence à la classe de modèles à boîte noire et, en particulier, aux modèles à séries chronologiques. L' étude actuelle comporte deux techniques de modélisation de classe de modèles à boîte noire qui ont été utilisées pour modéliser les données obtenues des opérations de traitement à pleine échelle à la station de traitement des eaux usées Gold Bar (GBWWTP), la plus grande station de traitement des eaux usées dans la région d'Edmonton (Alberta, Canada). Un réseau neural artificiel a été conçu pour prédire à court terme la quantité d'eaux usées pénétrant dans la station de traitement durant des tempêtes en utilisant les données de précipitations provenant de huit jauges couvrant les régions de la ville couvertes par le réseau unitaire d'assainissement. Une fois développé, le modèle a réussi à très bien généraliser lorsque ses données ont été confrontées à un nouvel ensemble de données. Des séries chronologiques de fonction de transfert ont été utilisées pour modéliser les données qualitatives recueillies dans le bassin de décantation primaire de la station de traitement. Les modèles ont prédit les solides totaux en suspension et la demande chimique en oxygène dans l'effluent primaire, selon une base horaire. Les modèles présentés possèdent les critères de prédiction et d'adaptation requis pour être utilisés dans un système de contrôle en temps réel. Mots clés : modélisation dynamique, réseaux neuraux artificiels, modèles de fonctions de transfert, arrivée des eaux usées, décantation primaire. [Traduit par la rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
44. Thirty-five years of activity at the Lesueur landslide, Edmonton, Alberta.
- Author
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Cruden, D M, Peterson, A E, Thomson, S, and Zabeti, P
- Subjects
LANDSLIDES ,EROSION ,MUDSTONE - Abstract
The Lesueur landslide occurred on 3 September 1963 on the outside of a meander of the North Saskatchewan River in northeast Edmonton. The displaced volume was 0.76 Mm[sup 3] of Pleistocene deposits and underlying Upper Cretaceous mudstones. The trigger of the landslide is believed to be accelerated erosion of the slope toe caused by dumping of mine waste on the inside of the meander. Surveys in 1964, 1971, 1992, 1995, 1997, and 1998 have documented continued slope movements. The main scarp grew in height from 7.5 m on 4 September 1963 to 13.9 m in 1995 but retrogressed only 3 m. The displaced material extended up to 24 m into the North Saskatchewan River. When the forward motion of the passive block of the translational slide ceased to be driven by the sinking of the active block, river erosion caused rotational sliding of the displaced material on the surface of separation.Key words: landslide, Edmonton, Cretaceous, mudstone, erosion, North Saskatchewan River.Le glissement de Lesueur s'est produit le 3 septembre 1963 sur l'extérieur d'un méandre de la rivière North Saskatchewan au nord est de Edmonton. Le volume déplacé était de 0,76 Mm[sup 3] de dépôts du Pléistocène et d'argilites sous-jacents du Crétacée supérieur. On croit que le facteur déclencheur du glissement est l'érosion accélérée du talus causée par le déversement de résidus miniers à l'intérieur du méandre. Des relevés en 1964, 1971, 1992, 1995, 1997, et 1998 ont documenté des mouvements continuels du talus. La principale cicatrice s'est accrue en hauteur de 7,5 m le 4 septembre 1963 à 13,9 m en 1995, mais a rétrogressé de seulement 3 m. Lorsque le mouvement vers l'avant du bloc de butée du glissement de translation résultant de l'enfoncement du bloc de poussée a cessé de se produire, l'érosion de la rivière a causé un mouvement de glissement en rotation du matériau déplacé sur la surface de séparation.Mots clés : glissement, Edmonton, Crétacée, argilite, érosion, rivière North Saskatchewan.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
45. A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta.
- Author
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Holmes, Robert B, Forster, Catherine, Ryan, Michael, and Shepherd, Kieran M
- Subjects
CHASMOSAURUS ,DINOSAURS ,ORNITHISCHIA - Abstract
Chasmosaurus irvinensis (sp. nov.) is distinguished from other species of this genus by the possession of a broad snout, absence of a brow horn (the position of which is occupied by a pit or rugosities suggestive of bone resorption), broadly rounded and open jugal notch, subrectangular squamosal, straight posterior parietal bar bearing 10 epoccipitals, eight of which are flattened, strongly curved anterodorsally, and nearly indistinguishably coossified to their neighbours, and small, transversely oriented parietal fenestrae restricted to the posterior portion of the frill. This species, restricted to the upper part of the Dinosaur Park Formation, is significantly younger than the other recognized Canadian Chasmosaurus species, C. belli and C. russelli. Phylogenetic analysis shows that C. irvinensis is most closely related to the other Canadian Chasmosaurus species and more distantly related to Chasmosaurus mariscalensis from Texas.Chasmosaurus irvinensis (sp. nov.) se distingue des autres espèces de ce genre par son large boutoir, l'absence d'une corne sur le front (cette position est occupée par une fossette ou des rugosités qui suggèrent une résorption osseuse), une encoche jugale généralement arrondie et ouverte, un temporal presque rectangulaire, une barre pariétale postérieure droite comportant 10 époccipitaux, dont huit sont aplatis et fortement recourbés, dirigées en position antéro-dorsale et co-ossifiés à leurs voisins de façon presque indistincte, ainsi que de petites fenêtres pariétales à orientation transversale restreintes à la partie arrière de la collerette. Cette espèce, limitée à la portion supérieure de la Formation de Dinosaur Park, est beaucoup plus jeune que les autres espèces canadiennes de Chasmosaurus, C. belli et C. russelli. Une analyse phylogénique montre que C. irvinensis est plus étroitement lié aux autres espèces canadiennes de Chasmosaurus et moins étroitement lié au Chasmosaurus mariscalensis du Texas.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
46. A case history of shallow sloughing within cut slopes of an irrigation canal in salt-rich clayey colluvium.
- Author
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Globa, R S and Barbour, S L
- Subjects
IRRIGATION ,SALTS ,CLAY ,COLLUVIUM ,SALINITY - Abstract
An investigation and remediation of instability along cut slopes of an irrigation canal in salt-rich clayey colluvium in southern Alberta is described. Random sloughing of the canal side slopes began to occur 2 years after construction over a 7500 m length of canal and was nearly continuous over a 2500 m length 3 years later. The sloughs are shallow seated and most had the appearance of a "mud" flow. Soil salinity also developed along the canal slopes due to capillarity and evaporation. Failure of the clay slopes in the cut sections is attributed to swelling, dispersion, and softening of the subgrade due to exposure of the salt-laden clays to fresh water. In contrast, 600 m of salt-rich clayey colluvium compacted as a clay liner on the canal side slopes showed no evidence of sloughing and salt loading after 9 years of service. Good soil compaction inhibited softening and slope instability in these salt-rich soils. Results from detailed site investigations and observations, and the interplay of soil chemistry and geology, facilitated the selection of a satisfactory method of repair. Repairs consisted of reconstructing 2500 m of canal by overexcavating the canal subgrade and replacing those soils with compacted soil.Key words: clays, salts, dispersive, sloughing, salinity, compaction.On présente une étude et un comfortement de l'instabilité le long de pentes excavées d'un canal d'irrigation dans les colluvions argileux riches en sel dans le sud de l'Alberta. Des glissements superficiels aléatoires dans les pentes latérales du canal ont commencé à se produire 2 ans après la construction sur une longueur de 7500 m de canal et étaient quasiment continus sur une longueur de 2500 m après 3 ans. Les surfaces de glissement sont peu profondes, et la plupart avaient une apparence d'écoulements de boue. La salinité du sol s'est accentuée le long des pentes du canal à cause de la capillarité et de l'évaporation. La rupture des pentes argileuses dans les sections excavées est attribuée au gonflement, à la dispersion, et au ramollissement de la fondation par suite de l'exposition à l'eau douce des argiles chargées de sel. Par opposition, 600 m de colluvions argileux riches en sel compactés comme membrane argileuse sur les pentes latérales du canal n'ont montré aucune évidence de glissement de surface et d'absorption de sel après 9 ans de service. Un bon compactage du sol a empêché le ramollissement et l'instabilité de la pente dans ces sols riches en sel. Les résultats des études et observations détaillées du site, et l'interaction de la chimie et de la géologie ont facilité la sélection d'une méthode satisfaisante de réparation. Les réparations ont consisté en la reconstruction de 2500 m de canal par surexcavation de la fondation du canal et le remplacement de ces sols par un sol compacté.Mots clés : argiles, sels, dipersive, glissement de surface, salinité, compactage.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
47. Preglacial archaeological evidence at Grimshaw, the Peace River area, Alberta: Discussion.
- Author
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Driver, Jonathan C
- Subjects
ARCHAEOLOGY ,ANTHROPOLOGY ,RIVERS - Abstract
Comments on the preglacial archaeological evidence at Grimshaw, the Peace River area in Alberta presented by a study. Significance of the fractured quartzite cobbles from the base of a Wisconsinan Laurentide till in the area; Lack of contextual evidence of human presence in the area; Problems with the criteria and alternative explanations of the study.
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- 2001
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48. Preglacial archaeological evidence at Grimshaw, the Peace River area, Alberta: Reply.
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Chlachula, Jiri and Leslie, Louise
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ARCHAEOLOGY ,ANTHROPOLOGY ,RIVERS - Abstract
Presents a response to comments concerning a study on preglacial archaeological evidence at Grimshaw, the Peace River area in Alberta. Debates concerning archaeological evidence potentially predating the Palaeo-Indian traditions; Cultural evidence presented by the study; Irrelevance of the references to naturally fractured flint collections from the British crags.
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- 2001
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49. Discussion of "The Dorothy Bentonite: an extraordinary case of secondary thickening in a late Campanian volcanic ash fall in central Alberta".
- Author
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Pyle, David M
- Subjects
BENTONITE ,VOLCANIC ash, tuff, etc. ,LOGARITHMS - Abstract
Presents comments on a study concerning the role of bentonite in a case of secondary thickening in a late Campanian volcanic ash fall in central Alberta. Purpose of plotting the logarithm of isopach thickness against the square-root of the isopach area; Occurrence of exponential thickness decay.
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- 2003
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- View/download PDF
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