Separation of pumice from soil mixtures

Blind Source Separation: Recovering Signals from Mixtures

Separation and purification of bacteria from soil.

Bacteria were released and separated from soil by a simple blending-centrifugation procedure. The percent yield of bacterial cells (microscopic counts) in the supernatants varied over a wide range depending on the soil type. The superantants contained large amounts of noncellular organic material and clay particles. Further purification of the bacterial cells was obtained by centrifugation in d...

Blind Separation of Convolved Mixtures

Blind separation of noisy mixtures

We analyze blind separation of independent sources in the face of additive noise. The analysis is carried out in a likelihood framework, which allows estimates of the source signals, the mixing matrix and the noise level. In the face of noisy signals, the estimated sources are non-linear functionals of the observed signals, in contrast to the linear noise free case. We also discuss the generali...

Reducing nitrate leaching losses from a Taupo pumice soil using a nitrification inhibitor eco-n

The decline in water quality in Lake Taupo has been attributed to nitrogen (N) leaching from surrounding land areas. Pastoral agriculture has been identified as a significant contributor to this N transfer to the lake through animal urine deposition. There is therefore an immediate need for new management options to reduce N losses. The objective of this study was to measure the effectiveness o...