Ball mills are common grinding equipment in mineral processing industries. Ball wear results from three mechanisms namely impact, abrasion and corrosion. Of these, the corrosion mechanism is the least investigated, due to its chemical-electrochemical nature. Therefore, the aims of this research were to investigate the grinding chemistry influence (slurry pH, solid percentage, water chemistry an...

To investigate the determinants of maximal expiratory flow (MEF) with aging, 17 younger (7 men and 10 women, 39 +/- 4 yr, mean +/- SD) and 19 older (11 men and 8 women, 69 +/- 3 yr) subjects with normal pulmonary function were studied. For further comparison, we also studied 10 middle-aged men with normal lung function (54 +/- 6 yr) and 15 middle-aged men (54 +/- 7 yr) with mild chronic airflow...

Computational grid computing has emerged as one of the most promising research areas in high performance and distributed computing. The ability to allocate large numbers of resources for a parallel application with a greatly reduced cost makes the concept grid computing highly appealing. The heterogeneous nature of a grid creates a complex application environment; the nature of faults within th...

Non-Markovian reduced dynamics of an open system is investigated. In the case the initial state of the reservoir is the vacuum state, an approximation is introduced which makes possible to construct a reduced dynamics which is completely positive.

California is a leader among states in its efforts to cut greenhouse gas emissions. Under the California Global Warming Solutions Act of 2006 (Assembly Bill 32), the state has set itself on a course to reduce its greenhouse gas emissions to 1990 levels by the year 2020. In addition to its cap-and-trade program, California aims to accomplish this objective via a large assortment of complementary...

A new method to deal with reduced dynamics of open systems by means of the Schrödinger equation is presented. It allows one to consider the reduced time evolution for correlated and uncorrelated initial conditions.

Software services offer many opportunities like reduced cost for IT infrastructure. They also introduce new risks, for example the clients lose control over their data. While data can be secured against external threats using standard techniques, the service providers themselves have to be trusted to ensure privacy. In this paper, we examine methods that can increase the level of privacy a serv...

A reduced mechanism for the prediction of methane/air flames impinged by external electric fields is presented in this work. This composed 26 species and 134 reactions predicts current produced a burner stabilized flame with similar accuracy as state-of-the-art mechanisms while using fraction their reactions. Thus, proposed guarantees significant reduction computational cost without penalties e...