Efficiency at Sorting Cards in Compressed Air

Efficiency at Sorting Cards in Compressed Air.

At a site where compressed air was being used in the construction of a tunnel, 34 men sorted cards twice, once at normal atmospheric pressure and once at 3j, 2j, or 2 atmospheres absolute pressure. An additional six men sorted cards twice at normal atmospheric pressure. When the task was carried out for the first time, all the groups of men performing at raised pressure were found to yield a re...

Health and efficiency in trimix versus air breathing in compressed air workers.

The Western Scheldt Tunneling Project in the Netherlands provided a unique opportunity to evaluate the effects of trimix usage on the health of compressed air workers and the efficiency of the project. Data analysis addressed 318 exposures to compressed air at 3.9-4.4 bar gauge and 52 exposures to trimix (25% oxygen, 25% helium, and 50% nitrogen) at 4.6-4.8 bar gauge. Results revealed three inc...

Compressed Sampling for Spike Sorting

Our goal is to demonstrate the usefulness and efficiency of a compressed sensing approach when applied to the problem of spike sorting. This approach involves four steps towards transforming the raw spikes into a sparse basis with the fewest number of measurements require to achieve accurate clustering. We first train a dictionary which converts a spike into a sparse signal. We then sample the ...

LRM-Trees: Compressed Indices, Adaptive Sorting, and Compressed Permutations

LRM-Trees are an elegant way to partition a sequence of values into sorted consecutive blocks, and to express the relative position of the first element of each block within a previous block. They were used to encode ordinal trees and to index integer arrays in order to support range minimum queries on them. We describe how they yield many other convenient results in a variety of areas: compres...

Compressed Air Energy Storage