The increased production and commercial use of nanomaterials combined with a lack of regulation to govern their disposal may result in their introduction to soils and ultimately into groundwater systems. In this study, we investigated the transport behavior of carboxyl-functionalized single-walled carbon nanotubes (SWNTs) in columns packed with a natural soil. In general, SWNT deposition (filtr...

This paper presents the laboratory test results of vertical infiltration on two soil columns of finer over coarser soils subject to simulated rainfalls under conditions of no-ponding at the surface and constant head at the bottom. The main objectives were to evaluate the effect of rainfall intensity and duration; and to provide experimental evidence for soil water redistribution and hysteresis....

(Continued from Page 1, Columns) and Kappa Beta, freak show, Commons. All groups must have a representative at the school by 10 a.m., tomorrow morning to start work on their booth. Each organization must send at least one representative to help clean up Sunday morning at 10 a.m. Freshman girls have 12:30 hours tomorrow night for the Fair. Potter Club will present the opening show in the Auditor...

Capillary rise tests were conducted on soil columns containing of three layers sandy soils with coarser over finer to investigate the effect relatively interlayer. The capillary height, rate, and water distribution observed in laboratory four layered columns, two homogeneous (without interlayer) serving as controls. final maximum height column interlayer was larger than that without when laid a...

in the realistic manner, piles are similar to the slender columns that soil around them acts as a lateral support. the piles situated in the liquefiable soil layers, loss their lateral supports due to the liquefaction resulted from the seismic ground motion. in this case, pile has the potency of axial instability similar to the unsupported columns. this instability can lead to the lateral buckl...

Methyl iodide (MeI) is a promising alternative to methyl bromide in soil fumigation. The pest-control efficacy and ground water contamination risks of MeI as a fumigant are highly related to its gas-phase distribution and leaching after soil application. In this study, the distribution and leaching of MeI in soil following shank injection and subsurface drip application were investigated. Methy...

One of the soil improvement methods is using soil-cement columns, and one most common implementing these columns Jet grouting method. In this article, performance in excavation wall stabilization investigated a project located Chalous, north Iran, by several experimental real scale at depths 4, 8, 15 meters diameter 80 cm. By comparing settlement before after improvement, it was found that aver...

Displacement studies on leaching of bromide and two pesticides (atrazine and isoproturon) were conducted under unsaturated steady state flow conditions in 24 small undisturbed soil columns (5.7 cm in diameter and 10 cm long) each collected from two sites differing in soil structure and organic carbon content in North Germany. There were large and irregular variabilities in the characteristics o...

Antibiotics, such as sulfadiazine, reach agricultural soils directly through manure of grazing livestock or indirectly through the spreading of manure or sewage sludge on the field. Knowledge about the fate of antibiotics in soils is crucial for assessing the environmental risk of these compounds, including possible transport to the groundwater. Transport of (14)C-labelled sulfadiazine was inve...

In recent years, ground columns, such as vibro-concrete columns and geosynthetic-reinforced stone columns, have been increasingly used to support superstructures and embankments when they are constructed on soft foundations. Several new column technologies have emerged, including different shapes of concrete columns and composite columns. The column technologies have also been combined with oth...