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Showing 1 to 20 of 129 for “"Cementation"”.
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Revisiting Beachrock Cementation Processes
… cement producing fluids, processes affecting cementation, and geometry of beachrock. Three sites were chosen for analysis along the northwestern shoreline of Puerto Rico, near the cities of Aguada, Isabela, and Hatillo. To address these topics, we used field observations, petrography …
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Additive Manufacturing of Soil Using Bio-Cementation
… a layering approach where both bacterial and cementation solutions were applied on the surface of every layer using a volume-controlled spray system. The cuboidal specimens were tested in unconfined compression and the results indicated a notable increase in soil strength for clay soils using …
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Cementation and dolomitization of Mississippian limestones, Kentucky and Virginia
… time). Shallow burial cementation was less common to the south-east into the Appalachian Basin, where the Mississippian limestone is up to 1000 m thick. Here, phreatic meteoric diagenesis in more distal parts of the aquifer caused high-Mg calcite and aragonite grains to …
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The influence of cementation on liquefaction resistance of sands
… Recent evidence has shown that small degrees of cementation in a sand significantly reduce the likelihood of liquefication. However, the work to date has been limited to studies with conventional testing devices and simple loading paths. These devices are suspected of inducing premature failure …
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Calcite Cementation of Sixty-Five-Year-Old Aragonite Sand Dredge Pile
… into the meteoric vadose environment. Calcite cementation proceeded from the surface downward; meniscus cement preceded isopachous cement. The source of carbonate for the cements is internal to the spoils piles. In this example of aragonite sand in the very early stages of mineralogical …
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Effects of nonhomogeneous cementation in soils on resistance to earthquake effects
Small amounts of cementation in a sand increase its ability to sustain static and dynamic loads, even in a liquefaction type environment. This has been shown in previous research examining the behavior of both naturally cemented and artificially prepared samples. Cemented sands are present in many …
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Knee Balance Assessment During Cementation Is Detrimental to Initial TKA Tibial Tray Fixation
<p>Despite recent advancements in implant design and cement technique, aseptic tibial loosening remains the primary cause of revision after cemented total knee arthroplasty (TKA) [1]. While the mechanisms of tibial loosening are multifactorial, previous research has shown that third-generation …
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Cement types and cementation patterns of Middle Ordovician ramp- to-basin carbonates, Virginia
… cements which lack abundant evidence of early cementation. Major cementation of subtidal facies occurred under burial conditions. Burial cements in southeastern belts have a simple zonation reflecting progressive burial (up to 3000 m) of the carbonates. Shallow burial, non-luminescent cement in …
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Regional cementation associated with unconformity-sourced aquifers and burial fluids, Mississippian Newman Limestone, Kentucky
… to form a second nonluminescent cement. Most cementation appears to have been associated with post-Newman unconformities reflecting a shift to a wetter climate in Late Mississippian-Pennsylvanian time which generated regional aquifers. Aquifer cement abundance decreases away from recharge …
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THE BOND STRENGTH OF ADHESIVE RESIN CEMENT: TIME DIFFERENTIAL BETWEEN CEMENTATION AND FINISHING OF CAST DOWEL-CORES
… ADHESIVE RESIN CEMENT: TIME DIFFERENTIAL BETWEEN CEMENTATION AND FINISHING OF CAST DOWEL-CORES By Purnima Joan Shahani, D.D.S., M.S.A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Dentistry at Virginia Commonwealth University.Virginia …
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Petrography and geochemistry of Cambrian-Ordovician marine cements: Implications for Early Paleozoic cementation processes and seawater chemistry
The San Saba Member of the Wilberns Formation (Llano Uplift) and the Cow Head Group (Newfoundland) contain a variety of carbonate cements which exhibit petrographic evidence of having formed within Cambrian and Ordovician marine environments. Early marine cements which have not recrystallized …
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Fluidized cathode rate model for the cementation of copper by iron in the presence of copper particulates, A
Includes bibliographical references (pages 169-175).
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Relative timing of dolomitization and silica cementation in the Cambrian Potosi and Eminence Dolomites in the Illinois Basin, USA
… events of subsurface dolomitization and quartz cementation within dissolution voids (vugs). A detailed petrographic study has therefore been undertaken to reconstruct the complex history of post-depositional subsurface physical and chemical alteration (diagenesis) of the Potosi and Eminence …
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A Study of Compaction and Cementation of Sandstones in the Athabasca Basin, Northern Saskatchewan, Canada, and Implications for Uniformity-related Uranium Mineralization
… this study investigated the compaction and cementation characteristics of the sandstones from four drill cores (Rumpel Lake, WC79-01, BL-08-01, DV10-001) located in the central part of the basin. Samples were collected from different stratigraphic levels, including the Read, Manitou Falls, …
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ΜΕΛΕΤΗ ΤΗΣ ΑΥΘΟΡΜΗΤΗΣ ΗΛΕΚΤΡΟΧΗΜΙΚΗΣ ΑΠΟΘΕΣΗΣ ΙΟΝΤΩΝ ΜΟΛΥΒΔΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΣΕ ΣΙΔΗΡΟ ΚΑΙ Η ΣΗΜΑΣΙΑ ΤΗΣ ΣΤΗΝ ΕΠΕΞΕΡΓΑΣΙΑ ΥΓΡΩΝ Β...
… WERE TO MEASURE THE RATES OF LEAD-ION REMOVAL BY CEMENTATION WITH IRON BOTH FROM AQUEOUS SOLUTIONS AND INDUSTRIAL WASTEWATER AND TO MEASURE THE EFFECT OF DIFFERENT PARAMETERS ON THESE RATES. IN THE PRESENT WORK THEKINETICS OF THE PB-FE CEMENTATION SYSTEM WAS INVESTIGATED WITH THREE …
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