Stratigraphy and structural geology of the Goat Range Area, Southeastern British Columbia

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1987.MICROFICHE COPY AVAILABLE IN ARCHIVES AND LINDGREN. MIT's copy accompanied by maps in separate folder.Bibliography: leaves 256-268.by David Walter Klepacki.Ph.D

A theoretical study of the trinucleon system with the Bonn meson-exchange model for the nucleon-nucleon interaction

The ground state properties of \sp3He and \sp3H are calculated using momentum space Faddeev wave functions with the Bonn meson-exchange model for the two-nucleon interaction. These properties include the binding energy, Coulomb energy, asymptotic normalization constants, magnetic moment, and the electromagnetic form factors and radii associated with elastic electron scattering. Identical calculations are also carried out with the Paris and Reid soft-core potentials. With the Bonn potential, the triton binding energy is predicted to within 98% of the experimental value. The charge-dependence of the Bonn potential also allows a successful description of the \sp3He-\sp3H binding energy difference. The magnetic properties as predicted by the Bonn potential are in excellent agreement with experiment when meson-exchange effects are taken into account. As for the charge properties, only the charge radius is successfully predicted. Calculations of the cross sections for the photodisintegration of \sp3He and \sp3H are performed in the plane-wave impulse approximation. Attention is given to the sensitivity of the D-state in the nuclear wave functions

Escape hypothesis for the Stikine block

Comparison of stratigraphic, faunal, and paleomagnetic characteristics of the Stikine terrane of British Columbia with other terranes in the Cordilleran collage reveals broad similarities with a group of terranes that formed a volcanic belt marginal to North America in Paleozoic and early Mesozoic time. Unlike Stikine, these terranes lie inboard of another belt of terranes that represents an early Mesozoic subduction complex or melange belt. Thus, in British Columbia the marginal volcanic belt is apparently doubled. In the Columbia embayment region, the marginal volcanic and melange belts are missing, and rocks of the outermost major component of the collage, the Wrangellia superterrane, are juxtaposed directly against cratonic rocks. We propose that Stikine is the missing fragment from the Columbia embayment; its northward "tectonic escape" was driven by the early stages of collision of the Wrangefia superterrane with North America in Middle to Late Jurassic time. The escaped fragment was then trapped between melange and more northerly, later arriving parts of the Wrangellia superterrane in Early to mid-Cretaceous time

Guided performance analysis combining profile and trace tools

Performance analysis is very important to understand the applications’ behavior and to identify bottlenecks. Performance analysis tools should facilitate the exploration of the data collected and help to identify where the analyst has to look. While this functionality can promote the tools usage on small and medium size environments, it becomes mandatory for large-scale and many-core systems where the amount of data is dramatically increased. This paper proposes a new methodology based on the integration of profilers and timeline tools to improve and facilitate the performance analysis process.Peer Reviewe

Guided performance analysis combining profile and trace tools

Performance analysis is very important to understand the applications’ behavior and to identify bottlenecks. Performance analysis tools should facilitate the exploration of the data collected and help to identify where the analyst has to look. While this functionality can promote the tools usage on small and medium size environments, it becomes mandatory for large-scale and many-core systems where the amount of data is dramatically increased. This paper proposes a new methodology based on the integration of profilers and timeline tools to improve and facilitate the performance analysis process.Peer ReviewedPostprint (published version

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This memory advantage would allow us to solve the same problem as PESSL using a smaller number of MPI tasks or to solve a bigger problem using the same number of tasks. 3.3.4 Domain splitting Another good example for MPI is the Domain Splitting method. It assumes you have a domain that you split onto different MPI processes. The problem with this approach is that you will have to exchange border values between the different processes as shown in Figure 19. In general, you have to send information between processes that share a common edge. In our example, this involves communication between domains A and B and B and C. Depending on your problem, you might have communication between domains sharing a common edge, C and A in our example. If you have to do this, you might need a total of eight communications. There is an algorithm that, in a two-dimensional domain splitting, reduces the number of communications needed from eight unordered to four ordered ones. In a ssend column (gen.) 3.551 1.464 .331 All2All column 3.654 1.279 .621 Pack standard 3.599 1.508 .335 Pack column 3.364 1.272 .335 three-dimensional problem, you would only need six communication steps instead of 26. Figure 19 illustrates domain splitting with nine domains. Figure 19. Domain splitting with nine domains Here is a code fragment that transfers MPI_COMM_WORLD into a two dimensional Cartesian topology, defines two MPI data types on the border, and, finally, uses MPI_Sendrecv() to do the update. The trick is to define the data types to include the corners and also transfer them. In the code fragment, the update of the corner between each communication step is missing; this can be a problem depending on how the transposition is don