Abstract. Net accumulation records derived from alpine ice cores provide the most direct measurement of past precipitation. However, quantitative reconstruction for millennia remains challenging due to difficulty in identifying annual layers deeper sections cores. In this study, we propose a method reconstruct millennia, using as an example core drilled at Chongce cap northwestern Tibetan Plate...

Here we present the results of a targeted drilling campaign that facilitated geochronological study with coarse sampling resolution inside new cave site, Simons Cave, on west coast southern Africa. A combination radiocarbon (14C) dating and optically stimulated luminescence (OSL) was used as range-finder. Results confirmed preservation Holocene late Pleistocene sediments up to 133 ± 35 ka, over...

The objective of this study was to examine three well designs: drilled wells (20-30 m deep), closed dug wells (>5 m deep), and hand-dug open wells (<5 m deep), to determine the water quality for improving access to safe and clean water in rural communities. Heterotrophic plate count (HPC), total coliforms (TC), Escherichia coli (E. coli) and turbidity, were used to assess the water quality of 9...

In a study of a sediment core from the US Atlantic Coastal Plain (Ocean Drilling Program Site 174X-Millville), Wright and Schal-ler (1) claim to have resolved the onset of the Paleocene/Eocene carbon isotope excursion (CIE) across 13 y. Such a rapid change would require an enormous and instantaneous release of isotopically light carbon into the ocean/atmosphere, implicating comet impact. The cl...

The technology presents a number of environmental challenges as the wells are drilled vertically through aquifers on their way to the deep shale deposits thousands of feet under the surface, and then turned horizontally and drilled another several thousand feet through the shale deposit. Herein lies the challenge: in the process of drilling the wells and preparing them for production (including...

This experimental study aims to assess the effect of external sulfate attack on structural concrete made with a common Portland-limestone cement. The campaign, which ran for approximately three years, was performed standard-sized cylinders ([Formula: see text]15 cm × 30 cm) subject different exposure conditions. overall swelling specimens due chemical reactions monitored over time. Scanning ele...

T h e proportion of bivalve shells with drill holes i n fossil assemblages is commonly used as a measure of the intensity of predation by drilling gastropods. Previous studies have assumed that drilled and undrilled bivalve shells have equal preseruat ion wotentials. W e tested this assumption by measuring the mechanical strength of drilled and undrilled valves of the Recent bivalve Mulinia lat...