The ability of organic matter as well as carbonate ions to extract rare earth elements (REEs) from sandy sediments of a Coastal Plain aquifer was investigated for unpurified organic matter from different sources (i.e., Mississippi River natural organic matter, Aldrich humic acid, Nordic aquatic fulvic acid, Suwannee River fulvic acid, and Suwannee River natural organic matter) and for extractio...

Fibers are applied to construction works improve the strength and brittle failure of soil. In this paper, fibers with a length 6 mm added microbial cemented sand, fiber types content research variable. Unconfined compressive (UCS), permeability coefficient, water absorption rate, dry density, calcium carbonate precipitation solidified sand were tested. The physical mechanical properties on immo...

Sand dripping in 1 dimensional Sand Pile Model is rst studied. Patterns and signals appear. Their behaviors and interactions are explained and asymptotic approximations are made. The total collapsing time of a single stack of sand is linear in function of the number of grains.

The responses of coral reef flat microphytobenthos to short-term exposure to elevated levels of inorganic nitrogen (N) and phosphorus (P) were investigated in 1994 and 1995. Sand samples collected from the reef flat were maintained over 7 d in triplicate cultures with N-enriched (100 mM NO3), P-enriched (10 mM PO4), and ambient seawater. A fourth experiment used a treatment of combined N and P ...