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Articles 91 - 110 of 110
Full-Text Articles in Physical Sciences and Mathematics
Concrete Roughness Characterization Using Laser Profilometry For Fiber-Reinforced Polymer Sheet Application, Norbert H. Maerz, Poornima Chepur, John J. Myers, Justin Linz
Concrete Roughness Characterization Using Laser Profilometry For Fiber-Reinforced Polymer Sheet Application, Norbert H. Maerz, Poornima Chepur, John J. Myers, Justin Linz
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The failure of a reinforced concrete member strengthened with fiberreinforced polymer (FRP) laminates may be caused by crushing of concrete, rupture of FRP laminates, or delamination of the FRP sheet. Therefore, the effectiveness and failure mode of FRP sheets applied to beams and columns is related to the degree of adhesion of the epoxy to the concrete surface. When a peeling or delamination failure can be avoided, a more effective engagement of the FRP sheet occurs, which results in more efficient use of the material. One of the principal factors affecting the bond behavior between the concrete and epoxy is …
Longshore Sediment Transport As A Function Of Energy Dissipation, Ernest R. Smith, Ping Wang
Longshore Sediment Transport As A Function Of Energy Dissipation, Ernest R. Smith, Ping Wang
Geology Faculty Publications
Experiments to measure waves, currents, and sediment transport rate for two breaker types, plunging and spilling, were conducted in a large-scale three-dimensional physical model. It was found that there was a large difference in cross-shore distribution and total sediment transport rate between the two breaker types. Total transport rates compared to existing predictive equations. The equations generally did not predict the data well. With the exception of the Kamphuis (1991) equation, which included a dependence on wave period, the predictive equations did not differentiate between breaker types.
Field Trip Guide (For The Nebraska Well Drillers Association) Western Nebraska Geology, J. Cannia, D. Weinert, D. Brost, C. Miller, D. Carlson
Field Trip Guide (For The Nebraska Well Drillers Association) Western Nebraska Geology, J. Cannia, D. Weinert, D. Brost, C. Miller, D. Carlson
Conservation and Survey Division
No abstract provided.
Resource Notes-Academic Year 2000-01
Resource Notes-Academic Year 2000-01
Conservation and Survey Division
No abstract provided.
A Pebble Count Comparison And Rock Magnetism Provenance Study Of Sumas Outwash, Jeff Laub
A Pebble Count Comparison And Rock Magnetism Provenance Study Of Sumas Outwash, Jeff Laub
WWU Graduate School Collection
The Sumas Stade, the last of the Fraser Glaciation advances, occurred between 12,000 and 10,000 14C years B.P. This study combines previous mapping (Easterbrook, 1976; Haugerud, written communication, 1999) with three new tests to establish a chronology for events of the Sumas Stade. Comparison of compositions of pebbles from Sumas outwash using multivariate statistics such as hierarchical clustering and k-means clustering revealed three major groups of late Sumas outwash and one earlier deposit. Magnetic susceptibility and Curie temperature analysis determined a general British Columbia provenance for the Sumas outwash. Flow direction measurements substantiated this determination. Taken together, these tests …
Adams County Test Hole Logs, Perry B. Wigley
Adams County Test Hole Logs, Perry B. Wigley
Conservation and Survey Division
No abstract provided.
Logan County Test Hole Logs, Perry B. Wigley
Logan County Test Hole Logs, Perry B. Wigley
Conservation and Survey Division
No abstract provided.
Palaeoecology Of The Middle Cambrian Raymond Quarry Fauna, Burgess Shale, British Columbia, Matthew Galen Devereux
Palaeoecology Of The Middle Cambrian Raymond Quarry Fauna, Burgess Shale, British Columbia, Matthew Galen Devereux
Digitized Theses
An assemblage if over 9000 systematically collected fossils from the Middle Cambrian Burgess Shale was analyzed in order to resolve the palaeoecology. Sediment and fossil evidence both show that the constituent fauna was largely autochthonous. The 'standing crop' of organisms preserved with each burial event was affected by variable taphonomic factors both laterally and temporally, but information loss appears to have been minimized. An autecological review of the trophic nucleus provides new insights with regard to behavior of the organisms, including life habits and feeding strategies. Unlike their modern representatives, priapulid worms (or at least Ottoia) appear to have …
Saunders County Test Hole Logs, Raymond R. Burchett, Scott E. Summerside
Saunders County Test Hole Logs, Raymond R. Burchett, Scott E. Summerside
Conservation and Survey Division
No abstract provided.
Constraining The Crystallization And Post-Crystallization History Of The Wallamatogus Pluton, Maine, Using Compositional Data From Garnet, Biotite And Muscovite, Joy Kathleen Drake
Constraining The Crystallization And Post-Crystallization History Of The Wallamatogus Pluton, Maine, Using Compositional Data From Garnet, Biotite And Muscovite, Joy Kathleen Drake
Masters Theses
"The Wallamatogus Pluton, Maine, exhibits systematic variation in grain size, mineralogy, and phenocryst abundance (alkali-feldspar) from the margin to the center of the pluton. Three facies are recognized: 1) outermost, seriate, coarse-grained (Owe), 2) porphyritic medium- to fine-grained (Dwp ), 3) innermost, fine-grained equigranular (Dwf). These facies are concentrically arranged and their contacts are gradational. Muscovite and biotite occur in all facies; the outer two facies contain garnet, and tourmaline. Muscovite and biotite grains within micaceous enclaves compositionally overlap primary muscovite, suggesting that they are early-crystallized accumulations. Muscovite in multiphase clusters and secondary muscovite compositionally overlap, suggesting formation during post-crystallization …
Modeling Of Critically-Stratified Gravity Flows: Application To The Eel River Continental Shelf, Northern California, Malcolm E. Scully
Modeling Of Critically-Stratified Gravity Flows: Application To The Eel River Continental Shelf, Northern California, Malcolm E. Scully
Dissertations, Theses, and Masters Projects
An analytical and numerical model are presented and applied to predict gravitydriven transport and deposition of fluid mud layers that form within the wave boundary layer on the continental shelf off the Eel River in northern California. Observations indicate that following floods of the Eel River down-slope transport of fluid mud trapped within the wave boundary layer is the dominant across-shelf transport mechanism. The models are based upon the assumption that following significant floods, an abundant supply of easily suspended fine sediment is delivered to the coastal ocean, allowing a negative feedback mechanism to maintain the near-bed Richardson number at …
Ichnology Of Holocene Carbonate Eolianites Of The Bahamas, H. Allen Curran, Brian White
Ichnology Of Holocene Carbonate Eolianites Of The Bahamas, H. Allen Curran, Brian White
Geosciences: Faculty Publications
No abstract provided.
A Sea-Level Lowstand (Devil's Point Event) Recorded In Bahamian Reefs: Comparison With Other Last Interglacial Climate Proxies, Brian White, H. Allen Curran, Mark A. Wilson
A Sea-Level Lowstand (Devil's Point Event) Recorded In Bahamian Reefs: Comparison With Other Last Interglacial Climate Proxies, Brian White, H. Allen Curran, Mark A. Wilson
Geosciences: Faculty Publications
Reprinted from: Benjamin J. Greenstein and Cindy K. Carney (eds.) Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions: San Salvador, Gerace Research Center
Resilience And Recovery Of Coral Reefs From Large-Scale Disturbances: Contrasting Patterns For San Salvador Island, Bahamas, And Belize, Paulette M. Peckol, H. Allen Curran, Martha Robbart, Benjamin J. Greenstein
Resilience And Recovery Of Coral Reefs From Large-Scale Disturbances: Contrasting Patterns For San Salvador Island, Bahamas, And Belize, Paulette M. Peckol, H. Allen Curran, Martha Robbart, Benjamin J. Greenstein
Geosciences: Faculty Publications
Benjamin J. Greenstein and Cindy K. Carney (eds)
San Salvador, Gerace Research Center
Coastal Effects Of Hurricane Floyd On San Salvador Island, Bahamas, H. Allen Curran, Priscilla Delano, Brian White, Meredith Barrett
Coastal Effects Of Hurricane Floyd On San Salvador Island, Bahamas, H. Allen Curran, Priscilla Delano, Brian White, Meredith Barrett
Geosciences: Faculty Publications
Hurricane Floyd, a Category 4 storm with winds up to I 55 mph, made a close encounter with San Salvador Island on September 13-14, 1999. In addition to inflicting severe damage to homes, tourist facilities, businesses, and infrastructure on the island, the storm also caused considerable beach erosion and coastal modification, mostly on the western and northern coasts. This paper reports and documents with photos the findings of a survey of coastal erosion effects on four areas of the San Salvador coastline: Coast Guard Beach, Rocky Point south to Cockburn Town and Fernandez Bay, South of Sugarloaf toward Grotto Bay, …
Geology Of The Cooper Mountain Pluton, North Cascade Mountains, Washington Based On Magnetic Fabrics, Magnetic Remanence And Petrography, Tammy C. Fawcett
Geology Of The Cooper Mountain Pluton, North Cascade Mountains, Washington Based On Magnetic Fabrics, Magnetic Remanence And Petrography, Tammy C. Fawcett
WWU Graduate School Collection
A study of the 48 Ma Cooper Mountain pluton (CMP) in the North Cascade Mountains of Washington using anisotropy of magnetic susceptibility (AMS) defined the orientation of magnetic fabrics. Fabrics in limited areas at the margins of the CMP tend to be parallel to the pluton margin and are therefore interpreted to be emplacement-related. The fabrics in the interior of the body, throughout the bulk of the pluton, are discordant with respect to the NW pluton margin. The fabric is manifest by NW-striking, moderately to steeply dipping foliation and NW-SE trending, moderately to shallowly plunging lineation, approximately parallel to regional …
Petrology And Geochemistry Of Mafic Lavas Near Glacier Peak, North Cascades, Washington, Dylan D. (Dylan Douglas) Taylor
Petrology And Geochemistry Of Mafic Lavas Near Glacier Peak, North Cascades, Washington, Dylan D. (Dylan Douglas) Taylor
WWU Graduate School Collection
Major element, trace element, and mineral compositions have been determined for four Quaternary mafic monogenetic cinder cones and flows south of Glacier Peak, a dacitic stratovolcano in the northern Cascade arc. The flows are the Whitechuck basalt, and the basaltic andesites of Indian Pass, Lightning Creek, and Dishpan Gap. Whitechuck has high concentrations of AI2O3 (≥ 18 wt.%) and low concentrations of K2O (≤ 0.45 wt.%) and shares similar trace element characteristics with high alumina olivine tholeiites reported in the central and southern Cascades. The three basaltic andesites are calc-alkaline. Indian Pass and Lighting Creek …
Changes In Mirror Lake, Northwestern Washington, As A Result Of The Diversion Of Water From The Nooksack River, Karel Tracy
Changes In Mirror Lake, Northwestern Washington, As A Result Of The Diversion Of Water From The Nooksack River, Karel Tracy
WWU Graduate School Collection
Mirror Lake, a small lake in northwest Washington, has been used as a settling pond for water diverted from the Middle Fork of the Nooksack River since 1962. In this thesis, I combine bathymetric data and sediment sampling to document the changes in sedimentation that have resulted from this diversion, and compare these results to a previous study conducted in 1991.
To document the change in the bathymetry of Mirror Lake since 1991, I surveyed the lake in the summer of 2000 using a theodolite and sonar depth gauge. I compared a contour map generated from this survey to the …
Late Pleistocene Littoral Deposits In The Deming Sand At Bellingham Bay, Washington, And Their Implications For Relative Sea Level Changes, Stacy J. (Stacy Joanna) Weber
Late Pleistocene Littoral Deposits In The Deming Sand At Bellingham Bay, Washington, And Their Implications For Relative Sea Level Changes, Stacy J. (Stacy Joanna) Weber
WWU Graduate School Collection
Recent mass wasting of sea cliffs along Bellingham Bay in Northwest Washington has exposed late Pleistocene littoral deposits in the Deming sand, which is underlain by Kulshan glaciomarine drift (gmd) and overlain by Bellingham glaciomarine drift (Easterbrook 1963). Marine shells in the Kulshan gmd were dated at 12,210 ± 80 14C-yrs B. P. and marine shells in the Deming sand were dated at 11,760 ± 85 and 11,685 ± 85 14C-yrs B. P. Marine shells in the Bellingham gmd were dated at 12,150 + 210 14C-yrs B. P.
Fossiliferous Kulshan glaciomarine drift is overlain by 11.5 m …
Karst Genetic Model For The French Bay Breccia Deposits, San Salvador, Bahamas, Lee J. Florea, John Mylroie, Jim Carew
Karst Genetic Model For The French Bay Breccia Deposits, San Salvador, Bahamas, Lee J. Florea, John Mylroie, Jim Carew
Lee J Florea, PhD, P.G.
No abstract provided.