A system of routine foliar analysis of sugar cane for N, P, K, Ca, Mg and S is discussed which, together with subsequent field soil analysis, is used as criteria for fertilizer recommendations on the estates and privately-owned sugar farms in the Rhodesian Lowveld. The sampling techniques and analytical methods described are reasonably rapid, economical and accurate. Furthermore, they do not re...

This paper presents the architecture used to develop a micro-robot for narrow pipes inspection. Both the electromechanical design and the control scheme will be described. In pipe environments it is very useful to have a method to retrieve information of the state of the inside part of the pipes in order to detect damages, breaks and holes. Due to the different types of pipes that exists, a mod...

The use of a Nomarski shear-interferometer with a sinusoidal phase modulation and four integrating buckets allows one to obtain the displacement field of the surface of a micro-cantilever observed in reflection microscopy. One can apply an electrostatic loading to this micro-object, which is first represented as an unknown pressure field. When retrieving both the flexural stiffness field and th...

Conventional Hall devices are widely employed to measure magnetic fields produced by millimetre sized (or larger) current-caring conductors or permanent magnets with a standard active area of about (100 μm). Micro-Hall sensors have recently emerged as a powerful and sensitive tool for the investigation of local magnetic field properties of the micro and nanostructures. The conventional Hall eff...

A novel, centrifugal disk-based micro-total analysis system (μTAS) for low cost and high throughput semi-automated immunoassay processing was developed. A key innovation in the disposable immunoassay disk design is in a fluidic structure that enables very efficient micro-mixing based on a reciprocating mechanism in which centrifugal acceleration acting upon a liquid element first generates and ...

The Spaulding classification, originally proposed in 1957, is a widely used system for matching the disinfection and sterilization of surfaces, particularly those of re-usable medical/surgical devices, with available processes. It presents a ranking, from simple disinfection through to sterilization, that should be considered in the reprocessing of devices, based on the risks associated with th...

Since invention of the diamond anvil cell technique in the late 1950s for studying materials at extreme conditions, the maximum static pressure generated so far at room temperature was reported to be about 400 GPa. Here we show that use of micro-semi-balls made of nanodiamond as second-stage anvils in conventional diamond anvil cells drastically extends the achievable pressure range in static c...

Very fast transients due to micro-gap discharges as low voltage electrostatic discharges (ESDs) were investigated in time domain. We previously developed a 12GHz wideband measurement setup consisting of a distributed constant system, while the observed transients due to micro-gap discharges had very fast rise time of 34 ps or less, which reached the limitation on our system. In this paper, we p...

Title of dissertation: CAPTURING MICRO-EMULSIONS AND MICRO-FOAMS WITH THE ARBITRARY LAGRANGIAN EULERIAN METHOD Andrew Brandon, Doctor of Philosophy, 2015 Dissertation directed by: Professor Konstantina Trivisa Department of Mathematics The goal of this work is to develop a 2D, heterogenous model for the purpose of studying liquid drainage from micro-foams and micro-emulsions. Liquid drainage wi...

The rapid development of X-ray micro-computed tomography (micro-CT) opens new opportunities for 3D analysis particle and grain-size characterisation, determination densities shape factors, estimation mineral associations liberation locking. Current practices in are based on 2D representations leading to systematic errors the extrapolation volumetric properties. New quantitative methods tomograp...