scholarly journals A new model for the Paleogene motion of Greenland relative to North America: Plate reconstructions of the Davis Strait and Nares Strait regions between Canada and Greenland

2012 ◽  
Vol 117 (B10) ◽  
Author(s):  
Gordon N. Oakey ◽  
James A. Chalmers
Keyword(s):  
North America ◽  
New Model ◽  
Nares Strait ◽  
Davis Strait ◽  
Plate Reconstructions

Paleomagnetism of Cretaceous volcanic rocks of the Sverdrup Basin—magnetostratigraphy, paleolatitudes, and rotations

1988 ◽  
Vol 25 (8) ◽  
pp. 1220-1239 ◽  
Author(s):  
P. J. Wynne ◽  
E. Irving ◽  
K. G. Osadetz
Keyword(s):  
North America ◽  
Standard Error ◽  
Volcanic Rocks ◽  
Ellesmere Island ◽  
The Arctic ◽  
Structural Domain ◽  
Nares Strait ◽  
Sverdrup Basin ◽  
Plate Reconstructions ◽  
Normal Polarity

The principal magnetization of lavas of the Isachsen and Strand Fiord formations on Axel Heiberg Island is shown to predate the Eocene Eurekan Orogeny. Basalt flows of the Strand Fiord Formation, volcanigenic sandstone from the Christopher Formation, and the uppermost flows of the Isachsen Formation are normally magnetized. Reversed magnetizations are found only in the Isachsen Formation, occurring at two horizons, which, we suggest, correspond to M0 and M1 of the M sequence of marine magnetic anomalies (118–123 Ma). It is possible, therefore, that we have located, at least approximately, the base of the Cretaceous normal polarity superchron in these sections. Because inclinations are steep, the analysis of directions of magnetization is not straightforward and has been done by two methods. Method I assumes that no relative rotations have occurred amongst sample localities, and calculations on this basis show a 33 ± 24 °(P = 0.05) counterclockwise rotation with no paleolatitudinal displacement relative to North America. The rotation is in agreement with the rotation of 36 ± 8 °(P = 0.05) determined earlier from the Permian Esayoo Formation on Ellesmere Island. Analysis by method I assumes that the Esayoo and the Isachsen – Strand Fiord sampling localities on Axel Heiberg and Ellesmere Island are contained within what is essentially one large structural domain. The agreement (using method I) of paleolatitude with that of North America is consistent with standard plate reconstructions in which there is a gap of about 300 km between Greenland and Ellesmere Island. However, the dispersion of site-mean directions is greater than that expected for paleosecular variation during the Cretaceous, and therefore some of the dispersion may be attributable to relative motions amongst collecting localities. Therefore, by method II, relative rotations amongst localities are assumed to have occurred, and inclinations and declinations are analysed separately. As with method I, declinations are predominantly counterclockwise from that expected, but by method II the mean inclination (74 ± 2 °standard error) is significantly shallower than that expected (79 ± 1 °standard error). This apparent flattening is consistent with the idea that the Arctic Islands were close to Greenland in the Cretaceous and that there was no gap along Nares Strait. Hence both methods of calculation yield similar counter clockwise rotation, but each gives slightly different paleolatitudes. The latter difference cannot at present be resolved.

scholarly journals The LOINC RSNA radiology playbook - a unified terminology for radiology procedures

2018 ◽  
Vol 25 (7) ◽  
pp. 885-893 ◽  
Author(s):  
Daniel J Vreeman ◽  
Swapna Abhyankar ◽  
Kenneth C Wang ◽  
Christopher Carr ◽  
Beverly Collins ◽  
...  
Keyword(s):  
North America ◽  
Unified Model ◽  
Model Representation ◽  
New Model ◽  
Radiological Society ◽  
Procedure Code ◽  
Regenstrief Institute ◽  
Governance Process ◽  
Procedure Codes

Abstract Objective This paper describes the unified LOINC/RSNA Radiology Playbook and the process by which it was produced. Methods The Regenstrief Institute and the Radiological Society of North America (RSNA) developed a unification plan consisting of six objectives 1) develop a unified model for radiology procedure names that represents the attributes with an extensible set of values, 2) transform existing LOINC procedure codes into the unified model representation, 3) create a mapping between all the attribute values used in the unified model as coded in LOINC (ie, LOINC Parts) and their equivalent concepts in RadLex, 4) create a mapping between the existing procedure codes in the RadLex Core Playbook and the corresponding codes in LOINC, 5) develop a single integrated governance process for managing the unified terminology, and 6) publicly distribute the terminology artifacts. Results We developed a unified model and instantiated it in a new LOINC release artifact that contains the LOINC codes and display name (ie LONG_COMMON_NAME) for each procedure, mappings between LOINC and the RSNA Playbook at the procedure code level, and connections between procedure terms and their attribute values that are expressed as LOINC Parts and RadLex IDs. We transformed all the existing LOINC content into the new model and publicly distributed it in standard releases. The organizations have also developed a joint governance process for ongoing maintenance of the terminology. Conclusions The LOINC/RSNA Radiology Playbook provides a universal terminology standard for radiology orders and results.

Ford Mondeo

2011 ◽  
pp. 281-297
Author(s):  
Michael J. Mol
Keyword(s):  
Information Technology ◽  
North America ◽  
International Cooperation ◽  
New Technology ◽  
Single Model ◽  
New Model ◽  
Advantages And Disadvantages ◽  
New Information

This case weighs the advantages and disadvantages of going global. Ford presented its 1993 Mondeo model, sold as Mystique and Contour in North America, as a “worldcar”. It tried to build a single model for all markets globally to optimize scale of production. This required strong involvement from suppliers and heavy usage of new information technology. The case discusses the difficulties that needed to be overcome as well as the gains that Ford expected from the project. New technology allowed Ford to overcome most of the difficulties it had faced in earlier attempts to produce a worldcar. IT was flanked by major organization changes within Ford. Globalization did not spell obvious success though. While Ford may in the end have succeeded in building an almost global car, it did not necessarily build a car that was competitive in various markets. The Mondeo project resulted in an overhaul of the entire organization under the header of Ford 2000. This program put a heavy emphasis on globalization although it perhaps focused too little on international cooperation and too much on centralization. In terms of Ford’s own history, the Mondeo experience may not be called a new Model T, but does represent an important step in Ford’s transformation as a global firm.

Ford Mondeo

2011 ◽  
pp. 69-89
Author(s):  
Michael J. Mol
Keyword(s):  
Information Technology ◽  
North America ◽  
International Cooperation ◽  
New Technology ◽  
Single Model ◽  
New Model ◽  
Advantages And Disadvantages ◽  
New Information

This case weighs the advantages and disadvantages of going global. Ford presented its 1993 Mondeo model, sold as Mystique and Contour in North America, as a ‘world car.’ It tried to build a single model for all markets globally to optimize scale of production. This required strong involvement from suppliers and heavy usage of new information technology. The case discusses the difficulties that needed to be overcome as well as the gains that Ford expected from the project. New technology allowed Ford to overcome most of the difficulties it had faced in earlier attempts to produce a world car. IT was flanked by major organization changes within Ford. Globalization did not spell obvious success though. While Ford may in the end have succeeded in building an almost global car, it did not necessarily build a car that was competitive in various markets. The Mondeo project resulted in an overhaul of the entire organization under the header of Ford 2000. This program put a heavy emphasis on globalization although it perhaps focused too little on international cooperation and too much on centralization. In terms of Ford’s own history, the Mondeo experience may not be called a new Model T, but does represent an important step in Ford’s transformation as a global firm.

scholarly journals Full-fit reconstruction of the Labrador Sea and Baffin Bay

2013 ◽  
Vol 5 (2) ◽  
pp. 917-962 ◽  
Author(s):  
M. Hosseinpour ◽  
R. D. Müller ◽  
S. E. Williams ◽  
J. M. Whittaker
Keyword(s):  
North America ◽  
Continental Crust ◽  
Seafloor Spreading ◽  
Labrador Sea ◽  
Gravity Inversion ◽  
Seismic Profiles ◽  
Baffin Bay ◽  
Davis Strait ◽  
Break Up ◽  
Magnetic Lineations

Abstract. Reconstructing the opening of the Labrador Sea and Baffin Bay between Greenland and North America remains controversial. Recent seismic data suggest that magnetic lineations along the margins of the Labrador Sea, originally interpreted as seafloor spreading anomalies, may lie within the crust of the continent–ocean transition. These data also suggest a more seaward extent of continental crust within the Greenland margin near the Davis Strait than assumed in previous full-fit reconstructions. Our study focuses on reconstructing the full-fit configuration of Greenland and North America using an approach that considers continental deformation in a quantitative manner. We use gravity inversion to map crustal thickness across the conjugate margins, and assimilate observations from available seismic profiles and potential field data to constrain the likely extent of different crustal types. We derive end-member continental margin restorations following alternative interpretations of published seismic profiles. The boundaries between continental and oceanic crust (COB) are restored to their pre-stretching locations along small circle motion paths across the region of Cretaceous extension. Restored COBs are fitted quantitatively to compute alternative total-fit reconstructions. A preferred full-fit model is chosen based on the strongest compatibility with geological and geophysical data. Our preferred model suggests that (i) the COB lies oceanward of magnetic lineations interpreted as magnetic anomaly 31 (70 Ma) in the Labrador Sea, (ii) all previously identified magnetic lineations landward of anomaly 27 reflect intrusions into continental crust, and (iii) the Ungava fault zone in Davis Strait acted as a leaky transform fault during rifting. This robust plate reconstruction reduces gaps and overlaps in the Davis Strait and suggests that there is no need for alternative models proposed for reconstructions of this area including additional plate boundaries in North America or Greenland. Our favored model implies that break up and formation of continent–ocean transition (COT) first started in the southern Labrador Sea and Davis Strait around 88 Ma and then propagated north and southwards up to onset of real seafloor spreading at 63 Ma in the Labrador Sea. In the Baffin Bay, continental stretching lasted longer and actual break up and seafloor spreading started around 61 Ma (Chron 26).

scholarly journals ACRL’s 2018 Awards Program: Honoring outstanding achievements in academic librarianship

2017 ◽  
Vol 78 (8) ◽  
pp. 429
Author(s):  
Chase Ollis
Keyword(s):  
North America ◽  
Information Literacy ◽  
Oral Histories ◽  
New Model ◽  
Archival Material ◽  
Business College ◽  
Academic Librarianship

Every year, ACRL celebrates the opportunity to honor the outstanding achievements of academic and research librarians across North America. From a business college using monsters in the library to teach information literacy, to an assistant curator’s digital project of oral histories and archival material highlighting the contributions of Latinas and their families and organizations, to a college library’s new model of instruction using Research Parties and TED Talk as Research Inspiration, the innovations of our community have continued to demonstrate the notable impact librarianship has in the academic landscape.

The German University and Its Influence

2019 ◽  
pp. 274-288
Author(s):  
Charles E. McClelland
Keyword(s):  
Higher Education ◽  
Nineteenth Century ◽  
North America ◽  
World War I ◽  
Research University ◽  
World War ◽  
Student Preparation ◽  
New Model ◽  
Higher Education Systems ◽  
The University

The new-model German university of the nineteenth century built upon previous efforts to reform higher education and reached its highest point of development and influence before World War I. It shaped the roles of universities worldwide. Reforms reflected the conscious creation of institutions promoting cutting-edge research, in fields from physics and medicine to law and theology. This was combined with the highest standards of active, self-involved student preparation for the learned professions. Yet even at the height of its prestige, its contradictions and limitations were already visible by the 1920s. When the concept of the elite research university is subject to critique, revisiting its origins in Germany can provide stimulus to debates about the future of the university, not only in North America and Europe but in all countries with higher education systems influenced by the German or American models.

The USMCA: A “New Model” for Labor Governance in North America?

2021 ◽  
pp. 139-156
Author(s):  
Sandra Polaski ◽  
Kimberly A. Nolan García ◽  
Michèle Rioux
Keyword(s):  
North America ◽  
New Model

scholarly journals Cenozoic Relative Movements of Greenland and North America by Closure of the North Atlantic-arctic Plate Circuit: the Labrador Sea, Davis Strait and Baffin Bay

2021 ◽  
Author(s):  
Annabel Causer ◽  
Graeme Eagles ◽  
Lucía Pérez-Díaz ◽  
Jürgen Adam
Keyword(s):  
North America ◽  
North Atlantic ◽  
Data Uncertainty ◽  
Plate Motion ◽  
Labrador Sea ◽  
Motion Model ◽  
Continental Breakup ◽  
Baffin Bay ◽  
The North ◽  
Davis Strait

Abstract The processes that accommodated plate divergence between Greenland and North America are most confidently interpretable from a short-lived (61-42 Ma) sequence of magnetic isochrons in the Labrador Sea. Understanding of the preceding and following periods is impeded by the lack of clear isochrons in the basin’s continent-ocean transition and axial zones. By closing the regional plate circuit, we build and interpret a detailed plate motion model for Greenland and North America that is applicable in, but unaffected by data uncertainty from, the Labrador Sea, Davis Strait, and Baffin Bay. Among our findings, we show the Labrador Sea initially opened during a ~8.3-16.5 Myr-long period of focused extension culminating in continental breakup no earlier than 74-72 Ma, and experienced a ~80° change in spreading direction around 56 Ma. We describe some possible implications for the accommodation of strain prior to continental breakup and during extreme spreading obliquity.

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