Report of President Grand Valley State College 1962-1964: An Account of the Formative Years of a New Liberal Arts College in Michigan

The first formal report of Grand Valley State College\u27s first President to the Board of Control. The report covers the early stages of college history and development as well as the progress and achievements from 1962-1964.https://scholarworks.gvsu.edu/reports/1005/thumbnail.jp

Grand Valley State College: Its Developmental Years 1964-1968

Annual report of the President written as an account of events that transpired at Grand Valley State College during the first five years of operation, 1963-1968.https://scholarworks.gvsu.edu/reports/1001/thumbnail.jp

Techniques for monitoring and controlling yaw attitude of a GPS satellite

Techniques for monitoring and controlling yawing of a GPS satellite in an orbit that has an eclipsing portion out of the sunlight based on the orbital conditions of the GPS satellite. In one embodiment, a constant yaw bias is generated in the attitude control system of the GPS satellite to control the yawing of the GPS satellite when it is in the shadow of the earth

Dynamics of glacier calving at the ungrounded margin of Helheim Glacier, southeast Greenland

During summer 2013 we installed a network of 19 GPS nodes at the ungrounded margin of Helheim Glacier in southeast Greenland together with three cameras to study iceberg calving mechanisms. The network collected data at rates up to every 7 s and was designed to be robust to loss of nodes as the glacier calved. Data collection covered 55 days, and many nodes survived in locations right at the glacier front to the time of iceberg calving. The observations included a number of significant calving events, and as a consequence the glacier retreated ~1.5 km. The data provide real-time, high-frequency observations in unprecedented proximity to the calving front. The glacier calved by a process of buoyancy-force-induced crevassing in which the ice downglacier of flexion zones rotates upward because it is out of buoyant equilibrium. Calving then occurs back to the flexion zone. This calving process provides a compelling and complete explanation for the data. Tracking of oblique camera images allows identification and characterisation of the flexion zones and their propagation downglacier. Interpretation of the GPS data and camera data in combination allows us to place constraints on the height of the basal cavity that forms beneath the rotating ice downglacier of the flexion zone before calving. The flexion zones are probably formed by the exploitation of basal crevasses, and theoretical considerations suggest that their propagation is strongly enhanced when the glacier base is deeper than buoyant equilibrium. Thus, this calving mechanism is likely to dominate whenever such geometry occurs and is of increasing importance in Greenland

The 2008 Methoni earthquake sequence: the relationship between the earthquake cycle on the subduction interface and coastal uplift in SW Greece

Seismological, GPS and historical data suggest that most of the 40 mm yr$^{-1}$ convergence at the Hellenic Subduction Zone is accommodated through aseismic creep, with earthquakes of $\textit{M}$W ≲ 7 rupturing isolated locked patches of the subduction interface. The size and location of these locked patches are poorly constrained despite their importance for assessment of seismic hazard. We present continuous GPS time-series covering the 2008 MW 6.9 Methoni earthquake, the largest earthquake on the subduction interface since 1960. Post-seismic displacements from this earthquake at onshore GPS sites are comparable in magnitude with the coseismic displacements; elastic-dislocation modelling shows that they are consistent with afterslip on the subduction interface, suggesting that much of this part of the interface is able to slip aseismically and is not locked and accumulating elastic strain. In the Hellenic and other subduction zones, the relationship between earthquakes on the subduction interface and observed long-term coastal uplift is poorly understood. We use cGPS-measured coseismic offsets and seismological body-waveform modelling to constrain centroid locations and depths for the 2008 Methoni $\textit{M}$W 6.9 and 2013 Crete $\textit{M}$W 6.5 earthquakes, showing that the subduction interface reaches the base of the seismogenic layer SW of the coast of Greece. These earthquakes caused subsidence of the coast in regions where the presence of Pliocene–Quaternary marine terraces indicates recent uplift, so we conclude that deformation associated with the earthquake cycle on the subduction interface is not the dominant control on vertical motions of the coastline. It is likely that minor uplift on a short length scale (∼15 km) occurs in the footwalls of normal faults. We suggest, however, that most of the observed Plio-Quaternary coastal uplift in SW Greece is the result of thickening of the overriding crust of the Aegean by reverse faulting or distributed shortening in the accretionary wedge, by underplating of sediment of the Mediterranean seafloor, or a combination of these mechanisms.AH is supported by a Shell Exploration studentship. This study forms part of the NERC- and ESRC-funded project “Earthquakes Without Frontiers” under grant NEJ02001X/1, and was partly funded by the NERC grant “Looking inside the Continents from Space”

A Balloon Measurement of the Isotopic Composition of Galactic Cosmic Ray Boron, Carbon, and Nitrogen

The isotopic compositions of galactic cosmic ray boron, carbon, and nitrogen have been measured at energies near 300 MeV amu-1, using a balloon-borne instrument at an atmospheric depth of ~ 5 g cm-2. The calibrations of the detectors comprising the instrument are described. The saturation properties of the cesium iodide scintilla tors used for measurement of particle energy are studied in the context of analyzing the data for mass. The achieved rms mass resolution varies from ~ 0.3 amu at boron to ~ 0.5 amu at nitrogen, consistent with a theoretical analysis of the contributing factors. Corrected for detector interactions and the effects of the residual atmosphere, the results are 10B/B = 0.33+0.17-0.11, 13C/C = 0.06+0.13-0.01, and 15N/N = 0.42+0.19-0.17. A model of galactic propagation and solar modulation is described. Assuming a cosmic ray source composition of solar-like isotopic abundances, the model predicts abundances near earth consistent with the measurements.</p

Geology of Lake Bemidji State Park

One of a series of articles that appeared between 1947 and 1961 written by staff of the Minnesota Geological Survey and the University of Minnesota.Brief summary of the geology of Lake Bemidji State Park, northcentral Minnesota

Elements of Geology

382 tr. ; 24 cm