Notice bibliographique
Résumé
Introduction The U.S. economy consumes large amounts of imported oil. In 2006, U.S. consumption was about 20 million barrels per day (mbd), with domestic production a little over 8mbd. This gap of 12mbd (which has been growing since the 1970s) is 60 percent of U.S. consumption, with rising levels of imports making up the difference. Increased demand from countries like China and India has been associated with world prices rising to unprecedented levels. This has led to increased investment and production from higher-cost sources such as Canada's With conventional production peaking or declining in many countries, the vast potential of extraction from sand becomes commercially viable. Political instability in the Persian Gulf and Nigeria makes security of the supply chain an increasingly significant concern for the U.S. Since is priced in U.S. dollars, Canadian exports of sand petroleum will not be affected by the strong Canadian dollar (which is approaching parity with the U.S. dollar for the first time in decades). In the short run, gasoline demand is not very responsive to price changes, so the underlying demand conditions should remain consistent. Only a severe U.S. and worldwide recession (an unlikely prospect) would cause a sharp drop in prices. Therefore, conditions remain favorable for the continued development of the Canadian This essay reviews the increased significance of extracted from the Athabasca sands, located primarily in Alberta. As production ramped up from this nonconventional source, the tar became the oil sands. This narrative will proceed as follows: first, a review of current levels of production and proven reserves; second, the importance of Canadian exports to the United States; third, the increased presence of Asian nations, especially China, in Canadian sand production; fourth, the possible impact of Canada-Asia business on Canada-U.S. relations; fifth, recognition of the environmental challenges associated with sand development; and sixth, some conclusions about the long-term impacts of these developments. Oil Sands A recent article in the New York Times stated that Iraq's proven reserves stand at about 115 billion barrels, the world's third largest after Saudi Arabia and (Sept. 10, 2006). While this statement may be correct when counting conventional sources of oil, Canadian reserves should be ranked second, bumping down Iran and Iraq, when the sands are included. Since 2003, the Canadian sands have generally been included in total proven Canadian reserves. Overnight, this increased Canada's proven reserves from 5 billion to 180 billion barrels (Chastko 2004, xiii). As noted above, this places Canada second in the world to Saudi Arabia. Oil sand estimates, conservatively based on recoverable reserves using current technology, represent only 11 percent of the estimated 1.6 trillion barrels of sand in Alberta. In terms of actual production--what was recovered rather than what was recoverable--Canada was the eighth largest producer in the world in 2004 (Energy Information Administration [EIA] 2005). As improved technology allows for increased recovery rates, it is only a matter of time before Canadian reserves become the largest in the world. Oil sand production is expected to rise from current levels of 1 million barrels a day (mbd) to over 3mbd by 2015. While most output will be shipped to the U.S., some will be sold to China and other Asian nations. Oil exports have become increasingly important to Canada. Canada continues to enjoy an overall balance of trade surplus, especially with the United States, but has a deficit with most Asian countries, including China. While Canadian exports to the U.S. finally reached year 2000 levels once more in 2004, after a reduction following the tragedy of 9/11, these aggregate numbers hide the fact that foreign sales were flat or down in most categories--e. …
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,003 |
| Études des sciences et des technologies | 0,013 | 0,005 |
| Communication savante | 0,007 | 0,002 |
| Science ouverte | 0,001 | 0,002 |
| Intégrité de la recherche | 0,002 | 0,002 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,042 | 0,005 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».