In recent work [1], we introduced a new, linear-programming based method, for detecting underground features based on gravity measurements. The current paper takes this method one important step further, in that it makes it work under realistic conditions, where most of the physical characteristics of the environment are not known. In particular, the ADCS algorithm we introduce works when the f...

Particulate air pollution, specifically the fine particle fraction (PM2.5), has been associated with increased cardiopulmonary morbidity and mortality in general population studies. Occupational exposure to fine particulate matter can exceed ambient levels by a large factor. Due to increased interest in the health effects of particulate matter, many particle sampling methods have been developed...

N-Phenylbenzohydroxamic acid (PBHA) and its derivatives are widely employed as gravimetric reagents for many metal ions15• PBHA has also been reported as a reagent for the gravimetric estimation of copper and cobalt6• However it has been found that the introduction of electrophilic substituents like chlo.riine on the N-phenyl ring of the hydroxamic acid renders the reagent more selective due to...

Studies were carried out to evaluate a gravimetric method for the determination of soil organic matter by the mass loss at 300C. The gravimetric method was compared with Walkley-Black, using several brazilian soils with variable chemical and physical properties. Gravimetric method was positively correlated with Walkley-Black method with the following linear regression equation: y = 3.72x + 0.29...

In chemical measurements (for instance in titrimetric analysis) it is very important to precisely measure amount of liquid, the measurement is performed with use of various measuring vessels. Presently laboratories use all kinds of glass measuring vessels like: beakers, flasks, etc., for measurement of bigger volumes of liquid, and in case of small volumes glass pipettes. Glass pipettes have be...

In these methods, the response of the test organism to graded concentrations of the substance being assayed is determined, after a suitable incubation period, by measurement of the amount of growth in terms of dry cell weight. Under the conditions of assay, this weight is proportional to the concentration of the limiting factor. By comparing the response of the test organism to the sample being...

A CMOS MEMS platform for gravimetric biosensing in liquid has been fabricated and tested. The concept is an aluminum and silicon dioxide membrane, coated with polystyrene and functionalized with receptors. When the protein analyte binds to the receptors, the sensor mass increases which causes a shift in the resonant frequency. The device is electrostatically actuated and the displacement is sen...

In view of the increasing importance of acid-base equilibrium and of the r81e of the inorganic elements in the body economy, the accurate determination of sodium in the blood and body fluids becomes of increasing importance. Barber and Kolthoff (1) in 1928 were the first to employ the triple salt, uranyl zinc sodium acetate, for the quantitative determination of sodium. They ascribed to t,his s...