Mark B. Abbott

Nathan D Stansell15
Pratigya J Polissar6
15Nathan D Stansell
6Pratigya J Polissar
6Byron A Steinman
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Integrating protocol data manipulations is a strategy for increasing the throughput of network protocols. The idea is to combine a series of protocol layers into a pipeline so as to access message data more efficiently. This paper introduces a widely-applicable technique for integrating protocols. This technique not only improves performance, but also(More)
This paper reports our experiences implementing remote procedure call (RPC) protocols in the <italic>x</italic>-kernel. This exercise is interesting because the RPC protocols exploit two novel design techniques: <italic>virtual protocols</italic> and <italic>layered protocols</italic>. These techniques are made possible because the <italic>x</italic>-kernel(More)
Morpheus is special-purpose programming language that facilitates the efficient implementation of communication protocols. Protocols are divided into three categories, called <italic>shapes</italic>, so that they can inherit code and data structures based on their category; the programmer implements a particular protocol by refining the inherited structure.(More)
[1] We obtained quantitative multivariate data from each varve of a minerogenic lacustrine sequence from the Canadian High Arctic, using an image analysis technique applied to thin-sections. The information on each varve from the uppermost core section was compared with a 35 yr meteorological dataset. Snowmelt intensity, which is an index reflecting the(More)
Decadal and centennial mean state changes in South American summer monsoon (SASM) precipitation during the last 2,300 years are detailed using an annually resolved authigenic calcite record of precipitation δ(18)O from a varved lake in the Central Peruvian Andes. This unique sediment record shows that δ(18)O peaked during the Medieval Climate Anomaly (MCA)(More)
Lamination thickness measurements in sediments from Lake Tuborg, northern Ellesmere Island, Canada document an increase in high-energy hydrologic discharge events from $1865 to 1962. The timing of these events corresponds with evidence for an increase in the amount of melt on the adjacent Agassiz Ice Cap, as recorded in ice cores. There appears to have been(More)
The history of pre-Columbian metallurgy in South America is incomplete because looting of metal artifacts has been pervasive. Here, we reconstruct a millennium of metallurgical activity in southern Bolivia using the stratigraphy of metals associated with smelting (Pb, Sb, Bi, Ag, Sn) from lake sediments deposited near the major silver deposit of Cerro Rico(More)
  • Colin A Cooke, Prentiss H Balcom, Charles Kerfoot, Mark B Abbott, Alexander P Wolfe
  • 2011
The development of the mercury (Hg) amalgamation process in the mid-sixteenth century triggered the onset of large-scale Hg mining in both the Old and New Worlds. However, ancient Hg emissions associated with amalgamation and earlier mining efforts remain poorly constrained. Using a geochemical time-series generated from lake sediments near Cerro Rico de(More)
  • Nathan D Stansell, Mark B Abbott, Valentí Rull, Donald T Rodbell, Maximiliano Bezada, Encarni Montoya +1 other
  • 2010
a r t i c l e i n f o Keywords: paleoclimate glaciation palynology late Glacial glacier mass-balance A radiocarbon dated sediment record from Laguna de Los Anteojos, a cirque lake in the Mérida Andes of Venezuela, indicates that warmer and wetter atmospheric conditions occurred in the northern tropics at the onset of the Bølling (∼ 14,600 cal yr BP), and(More)