Grain size distribution analysis of prominent beds on Southern Central Chilean seamounts

Gravity cores obtained from isolated seamounts located within, and rising up to 300 m from the sediment-filled Peru-Chile Trench off Southern Central Chile (36°S-39°S) contain numerous turbidite layers which are much coarser than the hemipelagic background sedimentation. The mineralogical composition of some of the beds indicates a mixed origin from various source terrains while the faunal assemblage of benthic foraminifera in one of the turbidite layers shows a mixed origin from upper shelfal to middle-lower bathyal depths which could indicate a multi-source origin and therefore indicate an earthquake triggering of the causing turbidity currents. The bathymetric setting and the grain size distribution of the sampled layers, together with swath echosounder and sediment echosounder data which monitor the distribution of turbidites on the elevated Nazca Plate allow some estimates on the flow direction, flow velocity and height of the causing turbidity currents. We discuss two alternative models of deposition, both of which imply high (175-450 m) turbidity currents and we suggest a channelized transport process as the general mode of turbidite deposition. Whether these turbidites are suspension fallout products of thick turbiditic flows or bedload deposits from sheet-like turbidity currents overwhelming elevated structures cannot be decided upon using our sedimentological data, but the specific morphology of the seamounts rather argues for the first option. Oxygen isotope stratigraphy of one of the cores indicates that the turbiditic sequences were deposited during the last Glacial period and during the following transition period and turbiditic deposition stopped during the Holocene. This climatic coupling seems to be dominant, while the occurrence of megathrust earthquakes provides a trigger mechanism. This seismic triggering takes effect only during times of very high sediment supply to the shelf and slope.

Packed column air stripping.

Mode of access: Internet.

Sludge dewatering and drying on sand beds /

Mode of access: Internet.

Drag on naturally rippled beds under oscillatory flows /

Includes abstract.

Flow of gases through beds of broken solids,

At head of title: United States Department of commerce. R.P. Lamont, secretary. Bureau of Mines. Scott Turner, director.

A catalogue of surgeons' instruments, air and water beds, pillows, and cushions, bandages, trusses... : manufactured and sold by S. Maw & son.

Mode of access: Internet.

Hospital beds in Illinois : alternative systems and bed counts : a report for the Certificate of Need Committee, Illinois Health Care Cost Containment Council /

Includes bibliographical references.

The art of hatching and bringing up domestick fowls of all kinds at any time of the year. Either by means of the heat of hot-beds, or that of common fire.

Goldsmiths'-Kress no. 08498.8-1, suppl.

Societal factors and excess hospital beds : an exploratory study /

Mode of access: Internet.

Experiment station work, LXIII : Sterilizing tobacco plant beds, clover growing, curing clover hay, the velvet bean, draft horses, care of mares and foals /

"Compiled from the publications of the agricultural experiment stations."

Proposed Agate Fossil Beds National Monument, Nebraska.

"August 1963."

Hospital beds on the porch, roof playground

Kiwanis furnishes the recreation teacher. The King's Daughters have given generously of equipment, books, magazines, special toys.

Damp beds; a farce, in two acts.

Ahot: Duncombe's edition.

The treatment of domestic wastewater using small-scale vermicompost filter beds

The aim of this study is to quantity the effect of filter bed depth and solid waste inputs on the performance of small-scale vermicompost filter beds that treat the soluble contaminants within domestic wastewater. The study also aims to identify environmental conditions within the filters by quantifying the oxygen content and pH of wastewater held within it. Vermicompost is being utilised within commercially available on-site domestic waste treatment systems however, there are few reported studies that have examined this medium for the purpose of wastewater treatment. Three replicate small-scale reactors were designed to enable wastewater sampling at five reactor depths in 10-cm intervals. The surface of each reactor received household solid organic waste and 1301 m(-2) per day of raw domestic wastewater. The solid waste at the filter bed surface leached oxygen demand into the wastewater flowing through it. The oxygen demand was subsequently removed in lower reactor sections. Both nitrification and denitrification occurred in the bed. The extent of denitrification was a function of BOD leached from the solid waste. The environmental conditions measured within the bed were found to be suitable for earthworms living within them. The study identified factors that will affect the performance and application of the vermicompost filtration technology. (C) 2004 Elsevier B.V. All rights reserved.